千万级数据分页之三----实现设计时支持和数字分页
2008-04-08 18:18
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一。对上一版本源代码的修正
上一篇文章《 千万级数据分页之二---一个简单的自定义分页控件》发布了一个分页控件的源码，但是这个分页控件的设计时支持不太好，出现了“未处理的异常，输入字符串的格式不正确”的错误，如下图所示：
原因是以下代码引起的异常：
int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
修改为以下代码后即显示正常，如图所示：
if (_lblPageCount.Text == "")
...{
_lnkbtnLast.Enabled = false;
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
if (PageIndex == pageCount)//如果当前页为最后一页，则末页灰显
...{
_lnkbtnLast.Enabled = false;
}
else
...{
_lnkbtnLast.Enabled = true;
}
}
二、增加“自动套用格式”：
一个设计完善友好的控件离不开设计时支持，其中ControlDesigner作为web服务器控件的设计器的基类，通过继承此类，你可以实现需要的设计时效果。如果你要继承类似Label这样的控件，可以通过继承LabelDesigner来实现相应的功能。而要实现”自动套用格式“，就要继承DesignerAutoFormat类，实现自定义样式。DesignerAutoFormat 是一个基类，如果你想为你的控件在设计时提供格式化的功能,你可以从此类派生,你必须实现Apply方法,此方法会将相关联的控件设置样式.
继承DesignerAutoFormat类，重写Apply(Control control)方法，实现两种样式，分别是“英文样式”和“符号样式”。
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web.UI;
using System.Web;
using System.Web.UI.Design;
using System.Web.UI.Design.WebControls;
using System.Web.UI.WebControls;
using System.Drawing;
namespace CustomControls
...{
public class AspNetPagerAutoFormat : DesignerAutoFormat
...{
public AspNetPagerAutoFormat(string name) : base(name) ...{ }
public override void Apply(Control control)
...{
if (control is AspNetPager)
...{
AspNetPager aspNetPager = (AspNetPager)control;
if (this.Name == "英文样式")
...{
aspNetPager.ButtonText = "Go";
aspNetPager.FirstPageText = "First";
aspNetPager.PrePageText = "Prev";
aspNetPager.NextPageText = "Next";
aspNetPager.EndPageText = "End";
aspNetPager.LabelStyle.ForeColor = Color.Blue;
aspNetPager.LabelStyle.Font.Bold = true;
aspNetPager.TextBoxStyle.CssClass = "blue_rounded";
aspNetPager.TextBoxStyle.Width = Unit.Parse("50px");
aspNetPager.PageSize = 20;
aspNetPager.RecordCount = 0;
}
else if (this.Name == "符号样式")
...{
aspNetPager.ButtonText = "转到";
aspNetPager.FirstPageText = "<font face=webdings color="red">9</font>";
aspNetPager.PrePageText = "<font face=webdings color="red">7</font>";
aspNetPager.NextPageText = "<font face=webdings color="red">8</font>";
aspNetPager.EndPageText = "<font face=webdings color="red">:</font>";
aspNetPager.LabelStyle.ForeColor = Color.Red;
aspNetPager.LabelStyle.Font.Bold = true;
aspNetPager.TextBoxStyle.CssClass = "blue_rounded";
aspNetPager.TextBoxStyle.Width = Unit.Parse("40px");
aspNetPager.PageSize = 40;
}
}
else
...{
throw new Exception("The method or operation is not implemented.");
}
}
}
}
继承ControlDesigner类，重写AutoFormats属性以实现自定义“自动套用格式”，其中给AspNetPagerDesigner类加上加上SupportsPreviewControl元数据,这样可以支持预览功能：
using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Web.UI.Design;
namespace CustomControls
...{
[SupportsPreviewControl(true)]
public class AspNetPagerDesigner : ControlDesigner
...{
private DesignerAutoFormatCollection _dafc;
public override DesignerAutoFormatCollection AutoFormats
...{
get
...{
if (_dafc == null)
...{
_dafc = new DesignerAutoFormatCollection();
_dafc.Add(new AspNetPagerAutoFormat("英文样式"));
_dafc.Add(new AspNetPagerAutoFormat("符号样式"));
}
return _dafc;
}
}
}
}
下面是设计时效果，把鼠标移动到控件上方，右上角就会出现一个黑三角，点击该三角，出现一个任务栏，点击“自动套用格式”，就会出现“自动套用格式”对话框，选取左边列表的任意一个样式，点确定即可。
其中套用”英文样式后效果如下：
套用“字符样式后效果如下：
三、数字分页效果的实现：
首先定义十个LinkButton,如下代码所示：
private LinkButton _page_0;
private LinkButton _page_1;
private LinkButton _page_2;
private LinkButton _page_3;
private LinkButton _page_4;
private LinkButton _page_5;
private LinkButton _page_6;
private LinkButton _page_7;
private LinkButton _page_8;
private LinkButton _page_9;
在CreateChildControls()方法中生成这些控件，并定义一个共同的点击事件“BtnChangePage_Click”，
_page_0 = new LinkButton();
_page_0.ID = "_page_0";
_page_0.Click += new EventHandler(CurrentPage_Click);
_page_1 = new LinkButton();
_page_1.ID = "_page_1";
_page_1.Click += new EventHandler(CurrentPage_Click);
_page_2 = new LinkButton();
_page_2.ID = "_page_2";
_page_2.Click += new EventHandler(CurrentPage_Click);
_page_3 = new LinkButton();
_page_3.ID = "_page_3";
_page_3.Click += new EventHandler(CurrentPage_Click);
_page_4 = new LinkButton();
_page_4.ID = "_page_4";
_page_4.Click += new EventHandler(CurrentPage_Click);
_page_5 = new LinkButton();
_page_5.ID = "_page_5";
_page_5.Click += new EventHandler(CurrentPage_Click);
_page_6 = new LinkButton();
_page_6.ID = "_page_6";
_page_6.Click += new EventHandler(CurrentPage_Click);
_page_7 = new LinkButton();
_page_7.ID = "_page_7";
_page_7.Click += new EventHandler(CurrentPage_Click);
_page_8 = new LinkButton();
_page_8.ID = "_page_8";
_page_8.Click += new EventHandler(CurrentPage_Click);
_page_9 = new LinkButton();
_page_9.ID = "_page_9";
_page_9.Click += new EventHandler(CurrentPage_Click);
_txtPageIndex = new TextBox();
_txtPageIndex.ID = "txtPageIndex";
_lblPageSize = new Label();
_lblPageSize.ID = "lblPageSize";
this.Controls.Add(_page_0);
this.Controls.Add(_page_1);
this.Controls.Add(_page_2);
this.Controls.Add(_page_3);
this.Controls.Add(_page_4);
this.Controls.Add(_page_5);
this.Controls.Add(_page_6);
this.Controls.Add(_page_7);
this.Controls.Add(_page_8);
this.Controls.Add(_page_9);
CurrentPage_Click事件的代码：
protected void CurrentPage_Click(object sender, EventArgs e)
...{
string strID = ((LinkButton)sender).ID;
if (strID != "")
...{
int pageIndex = 0;
int pageNum = PageIndex / 10;
try
...{
int pageNum2 = int.Parse(strID.Split('_')[2]);
if (pageNum2 == 0)
pageNum2 = 10;
pageIndex = pageNum2 + pageNum*10;
}
catch
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('非法的页码!');</script>");
return;
}
_lblCurrentPage.Text = pageIndex.ToString();
OnPageChanged(EventArgs.Empty);
}
}
然后绘制控件，根据总页数和当前页码显示10个数字页，比如当前页是23页，则显示21到30共十个页的页码。
if (_lblPageCount.Text == "")
...{
for (int i = 0; i < 10; i++)
...{
LinkButton lb = (LinkButton)this.FindControl("_page_" + i.ToString());
lb.Enabled = false;
lb.Text = (i + 1).ToString();
lb.RenderControl(writer);
writer.Write(" ");
}
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text);
int quot = PageIndex / 10;
int rema = PageIndex % 10;
//PageNum = quot * 10;
if (pageCount < 10 || pageCount - PageIndex < 10)
...{
for (int i = quot * 10 + 1; i <= pageCount; i++)
...{
LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
lb2.Text = i.ToString();
if (i == PageIndex)
...{
lb2.Enabled = false;
lb2.Font.Bold = true;
lb2.ForeColor = Color.Red;
}
else
...{
lb2.Enabled = true;
}
lb2.RenderControl(writer);
writer.Write(" ");
}
}
else
...{
for (int i = quot * 10 + 1; i <= quot * 10 + 10; i++)
...{
LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
lb2.Text = i.ToString();
if (i == PageIndex)
...{
lb2.Enabled = false;
lb2.Font.Bold = true;
lb2.ForeColor = Color.Red;
}
else
...{
lb2.Enabled = true;
}
lb2.RenderControl(writer);
writer.Write(" ");
}
}
}
设计时效果如下图所示：
分页效果如下：
控件的源码如下：
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
namespace CustomControls
...{
[Designer(typeof(AspNetPagerDesigner)),ToolboxData("<{0}:AspNetPager runat='server' PageSize='25' FirstPageText='首页' PrePageText='上一页' NextPageText='下一页' EndPageText='末页' ButtonText='GO'></{0}:AspNetPager>")]
public class AspNetPager : WebControl, INamingContainer
...{
属性块#region 属性块
private object baseState = null;
private object buttonStyleState = null;
private object textBoxStyleState = null;
private object labelStyleState = null;
private object linkButtonStyleState = null;
private LinkButton _lnkbtnFrist;
private LinkButton _lnkbtnPre;
private LinkButton _lnkbtnNext;
private LinkButton _lnkbtnLast;
private Label _lblCurrentPage;
private Label _lblRecodeCount;
private Label _lblPageCount;
private Label _lblPageSize;
private TextBox _txtPageIndex;
private Button _btnChangePage;
private LinkButton _page_0;
private LinkButton _page_1;
private LinkButton _page_2;
private LinkButton _page_3;
private LinkButton _page_4;
private LinkButton _page_5;
private LinkButton _page_6;
private LinkButton _page_7;
private LinkButton _page_8;
private LinkButton _page_9;
private static readonly object EventPageChange = new object();
[Category("Pagination"), Description("每页显示的纪录数"),
DefaultValue("25")]
public virtual int PageSize
...{
get
...{
EnsureChildControls();
return _lblPageSize.Text.Trim() != "" ? int.Parse(_lblPageSize.Text.Trim()) : 25;
}
set
...{
EnsureChildControls();
_lblPageSize.Text = value.ToString();
}
}
[Category("Pagination"), Description("总纪录数"),
DefaultValue("0"), Bindable(true)]
public virtual int RecordCount
...{
get
...{
EnsureChildControls();
return _lblRecodeCount.Text.Trim() != "" ? int.Parse(_lblRecodeCount.Text.Trim()) : 0;
}
set
...{
EnsureChildControls();
if (value > 0)
...{
int recodeCount = value;
_lblPageCount.Text = (value % PageSize == 0 ? value / PageSize : value / PageSize + 1).ToString();//计算总页数
}
_lblRecodeCount.Text = value.ToString();
}
}
[Category("Pagination"), Description("当前页码"),
DefaultValue("1"), Bindable(true)]
public virtual int PageIndex
...{
get
...{
EnsureChildControls();
return _lblCurrentPage.Text.Trim() != "" ? int.Parse(_lblCurrentPage.Text.Trim()) : 1;
}
set
...{
EnsureChildControls();
_lblCurrentPage.Text = value.ToString();
}
}
[Category("Appearance"), Description("设置第一页的文本"),
DefaultValue("首页"), Bindable(true)]
public virtual string FirstPageText
...{
get
...{
EnsureChildControls();
return _lnkbtnFrist.Text.Trim() != "" ? _lnkbtnFrist.Text.Trim() : "首页";
}
set
...{
EnsureChildControls();
_lnkbtnFrist.Text = value;
}
}
[Category("Appearance"), Description("设置上一页的文本"),
DefaultValue("上一页"), Bindable(true)]
public virtual string PrePageText
...{
get
...{
EnsureChildControls();
return _lnkbtnPre.Text.Trim() != "" ? _lnkbtnPre.Text.Trim() : "上一页";
}
set
...{
EnsureChildControls();
_lnkbtnPre.Text = value;
}
}
[Category("Appearance"), Description("设置下一页的文本"),
DefaultValue("下一页"), Bindable(true)]
public virtual string NextPageText
...{
get
...{
EnsureChildControls();
return _lnkbtnNext.Text.Trim() != "" ? _lnkbtnNext.Text.Trim() : "下一页";
}
set
...{
EnsureChildControls();
_lnkbtnNext.Text = value;
}
}
[Category("Appearance"), Description("设置末页的文本"),
DefaultValue("末页"), Bindable(true)]
public virtual string EndPageText
...{
get
...{
EnsureChildControls();
return _lnkbtnLast.Text.Trim() != "" ? _lnkbtnLast.Text.Trim() : "末页";
}
set
...{
EnsureChildControls();
_lnkbtnLast.Text = value;
}
}
[Category("Appearance"), Description("设置跳转按钮的文本"),
DefaultValue(":"), Bindable(true)]
public virtual string ButtonText
...{
get
...{
EnsureChildControls();
return _btnChangePage.Text.Trim() != "" ? _btnChangePage.Text.Trim() : "GO";
}
set
...{
EnsureChildControls();
_btnChangePage.Text = value;
}
}
#endregion
分页事件相关#region 分页事件相关
public event EventHandler PageChanged
...{
add
...{
Events.AddHandler(EventPageChange, value);
}
remove
...{
Events.RemoveHandler(EventPageChange, value);
}
}
protected void OnPageChanged(EventArgs e)
...{
EventHandler handler = (EventHandler)Events[EventPageChange];
if (handler != null)
...{
handler(this, e);
}
}
#endregion
样式属性#region 样式属性
private Style _buttonStyle;
private Style _textBoxStyle;
private Style _linkButtonStyle;
[
Category("Styles"),
DefaultValue(null),
DesignerSerializationVisibility(
DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty),
Description(
"应用于按钮的样式")
]
public virtual Style ButtonStyle
...{
get
...{
if (_buttonStyle == null)
...{
_buttonStyle = new Style();
if (IsTrackingViewState)
...{
((IStateManager)_buttonStyle).TrackViewState();
}
}
return _buttonStyle;
}
}
[
Category("Styles"),
DefaultValue(null),
DesignerSerializationVisibility(
DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty),
Description(
"应用于链接按钮的样式")
]
public virtual Style LinkButtonStyle
...{
get
...{
if (_linkButtonStyle == null)
...{
_linkButtonStyle = new Style();
if (IsTrackingViewState)
...{
((IStateManager)_linkButtonStyle).TrackViewState();
}
}
return _linkButtonStyle;
}
}
[
Category("Styles"),
DefaultValue(null),
DesignerSerializationVisibility(
DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty),
Description(
"应用于文本框的样式")
]
public virtual Style TextBoxStyle
...{
get
...{
if (_textBoxStyle == null)
...{
_textBoxStyle = new Style();
if (IsTrackingViewState)
...{
((IStateManager)_textBoxStyle).TrackViewState();
}
}
return _textBoxStyle;
}
}
private Style _labelStyle;
[
Category("Styles"),
DefaultValue(null),
DesignerSerializationVisibility(
DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty),
Description(
"应用于标签的样式")
]
public virtual Style LabelStyle
...{
get
...{
if (_labelStyle == null)
...{
_labelStyle = new Style();
if (IsTrackingViewState)
...{
((IStateManager)_labelStyle).TrackViewState();
}
}
return _labelStyle;
}
}
#endregion
自定义视图状态#region 自定义视图状态
protected override void LoadViewState(object savedState)
...{
if (savedState == null)
...{
base.LoadViewState(null);
return;
}
else
...{
Triplet t = savedState as Triplet;
if (t != null)
...{
base.LoadViewState(baseState);
if ((t.Second) != null)
...{
((IStateManager)ButtonStyle).LoadViewState(buttonStyleState);
}
if ((t.Third) != null)
...{
((IStateManager)TextBoxStyle).LoadViewState(textBoxStyleState);
}
if (labelStyleState != null)
...{
((IStateManager)(_labelStyle)).LoadViewState(labelStyleState);
}
if (linkButtonStyleState != null)
...{
((IStateManager)(_linkButtonStyle)).LoadViewState(linkButtonStyleState);
}
}
else
...{
throw new ArgumentException("Invalid view state .");
}
}
}
protected override object SaveViewState()
...{
baseState = base.SaveViewState();
buttonStyleState = null;
textBoxStyleState = null;
labelStyleState = null;
linkButtonStyleState = null;
if (_buttonStyle != null)
...{
buttonStyleState =
((IStateManager)_buttonStyle).SaveViewState();
}
if (_textBoxStyle != null)
...{
textBoxStyleState =
((IStateManager)_textBoxStyle).SaveViewState();
}
if (_labelStyle != null)
...{
labelStyleState = ((IStateManager)_labelStyle).SaveViewState();
}
if (_linkButtonStyle != null)
...{
linkButtonStyleState = ((IStateManager)_linkButtonStyle).SaveViewState();
}
return new Triplet(baseState,
buttonStyleState, textBoxStyleState);
}
protected override void TrackViewState()
...{
base.TrackViewState();
if (_buttonStyle != null)
...{
((IStateManager)_buttonStyle).TrackViewState();
}
if (_textBoxStyle != null)
...{
((IStateManager)_textBoxStyle).TrackViewState();
}
if (_labelStyle != null)
...{
((IStateManager)_labelStyle).TrackViewState();
}
if (_linkButtonStyle != null)
...{
((IStateManager)_linkButtonStyle).TrackViewState();
}
}
#endregion
生成控件#region 生成控件
protected override void CreateChildControls()
...{
this.Controls.Clear();
_btnChangePage = new Button();
_btnChangePage.ID = "btnChangePage";
_btnChangePage.Click += new EventHandler(BtnChangePage_Click);
_lblCurrentPage = new Label();
_lblCurrentPage.ID = "lblCurrentPage";
_lblPageCount = new Label();
_lblPageCount.ID = "lblPageCount";
_lblRecodeCount = new Label();
_lblRecodeCount.ID = "lblRecodeCount";
_lnkbtnFrist = new LinkButton();
_lnkbtnFrist.ID = "lnkbtnFrist";
_lnkbtnFrist.Click += new EventHandler(lnkbtnFrist_Click);
_lnkbtnLast = new LinkButton();
_lnkbtnLast.ID = "lnkbtnLast";
_lnkbtnLast.Click += new EventHandler(lnkbtnLast_Click);
_lnkbtnNext = new LinkButton();
_lnkbtnNext.ID = "lnkbtnNext";
_lnkbtnNext.Click += new EventHandler(lnkbtnNext_Click);
_lnkbtnPre = new LinkButton();
_lnkbtnPre.ID = "lnkbtnPre";
_lnkbtnPre.Click += new EventHandler(lnkbtnPre_Click);
_page_0 = new LinkButton();
_page_0.ID = "_page_0";
_page_0.Click += new EventHandler(CurrentPage_Click);
_page_1 = new LinkButton();
_page_1.ID = "_page_1";
_page_1.Click += new EventHandler(CurrentPage_Click);
_page_2 = new LinkButton();
_page_2.ID = "_page_2";
_page_2.Click += new EventHandler(CurrentPage_Click);
_page_3 = new LinkButton();
_page_3.ID = "_page_3";
_page_3.Click += new EventHandler(CurrentPage_Click);
_page_4 = new LinkButton();
_page_4.ID = "_page_4";
_page_4.Click += new EventHandler(CurrentPage_Click);
_page_5 = new LinkButton();
_page_5.ID = "_page_5";
_page_5.Click += new EventHandler(CurrentPage_Click);
_page_6 = new LinkButton();
_page_6.ID = "_page_6";
_page_6.Click += new EventHandler(CurrentPage_Click);
_page_7 = new LinkButton();
_page_7.ID = "_page_7";
_page_7.Click += new EventHandler(CurrentPage_Click);
_page_8 = new LinkButton();
_page_8.ID = "_page_8";
_page_8.Click += new EventHandler(CurrentPage_Click);
_page_9 = new LinkButton();
_page_9.ID = "_page_9";
_page_9.Click += new EventHandler(CurrentPage_Click);
_txtPageIndex = new TextBox();
_txtPageIndex.ID = "txtPageIndex";
_lblPageSize = new Label();
_lblPageSize.ID = "lblPageSize";
this.Controls.Add(_page_0);
this.Controls.Add(_page_1);
this.Controls.Add(_page_2);
this.Controls.Add(_page_3);
this.Controls.Add(_page_4);
this.Controls.Add(_page_5);
this.Controls.Add(_page_6);
this.Controls.Add(_page_7);
this.Controls.Add(_page_8);
this.Controls.Add(_page_9);
this.Controls.Add(_btnChangePage);
this.Controls.Add(_lblCurrentPage);
this.Controls.Add(_lblPageCount);
this.Controls.Add(_lblRecodeCount);
this.Controls.Add(_lnkbtnFrist);
this.Controls.Add(_lnkbtnLast);
this.Controls.Add(_lnkbtnNext);
this.Controls.Add(_lnkbtnPre);
this.Controls.Add(_txtPageIndex);
base.CreateChildControls();
}
#endregion
按钮点击事件#region 按钮点击事件
翻页相关的事件#region 翻页相关的事件
/**//// <summary>
/// 处理翻页事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkbtnFrist_Click(object sender, EventArgs e) //第一页
...{
_lblCurrentPage.Text = "1";
OnPageChanged(EventArgs.Empty);
}
protected void lnkbtnPre_Click(object sender, EventArgs e) //上一页
...{
int pageIndex = int.Parse(_lblCurrentPage.Text);
if (pageIndex > 0)
...{
pageIndex--;
_lblCurrentPage.Text = pageIndex.ToString();
OnPageChanged(EventArgs.Empty);
}
}
protected void lnkbtnNext_Click(object sender, EventArgs e)//下一页
...{
int pageIndex = int.Parse(_lblCurrentPage.Text);
int pageCount = int.Parse(_lblPageCount.Text);
if (pageIndex < pageCount)
...{
pageIndex++;
_lblCurrentPage.Text = pageIndex.ToString();
}
OnPageChanged(EventArgs.Empty);
}
protected void lnkbtnLast_Click(object sender, EventArgs e)//末页
...{
_lblCurrentPage.Text = _lblPageCount.Text;
OnPageChanged(EventArgs.Empty);
}
protected void CurrentPage_Click(object sender, EventArgs e)
...{
string strID = ((LinkButton)sender).ID;
if (strID != "")
...{
int pageIndex = 0;
int pageNum = PageIndex / 10;
try
...{
int pageNum2 = int.Parse(strID.Split('_')[2]);
if (pageNum2 == 0)
pageNum2 = 10;
pageIndex = pageNum2 + pageNum*10;
}
catch
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('非法的页码!');</script>");
return;
}
_lblCurrentPage.Text = pageIndex.ToString();
OnPageChanged(EventArgs.Empty);
}
}
#endregion
protected void BtnChangePage_Click(object sender, EventArgs e)//跳转到指定页
...{
int pageIndex = 0;
try
...{
pageIndex = int.Parse(_txtPageIndex.Text);
}
catch
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('请输入正确的页数!');</script>");
return;
}
int pageCount = int.Parse(_lblPageCount.Text);
if (pageIndex == 0)//如果为0，则提示错误
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('请输入正确的页数!');</script>");
return;
}
if (pageIndex > pageCount)//如果大于总页数则提示错误
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('请输入正确的页数!');</script>");
return;
}
_lblCurrentPage.Text = pageIndex.ToString();
OnPageChanged(EventArgs.Empty);
}
#endregion
重写TagKey#region 重写TagKey
protected override HtmlTextWriterTag TagKey
...{
get
...{
return HtmlTextWriterTag.Table;
}
}
#endregion
绘制控件#region 绘制控件
protected override void RenderContents(HtmlTextWriter writer)
...{
if (ButtonStyle != null)
...{
_btnChangePage.ApplyStyle(ButtonStyle);
}
if (TextBoxStyle != null)
...{
_txtPageIndex.ApplyStyle(TextBoxStyle);
}
if (LabelStyle != null)
...{
_lblCurrentPage.ApplyStyle(LabelStyle);
_lblPageCount.ApplyStyle(LabelStyle);
_lblRecodeCount.ApplyStyle(LabelStyle);
_lblPageSize.ApplyStyle(LabelStyle);
}
AddAttributesToRender(writer);
writer.RenderBeginTag(HtmlTextWriterTag.Tr);
writer.AddAttribute(HtmlTextWriterAttribute.Align, "right");
writer.RenderBeginTag(HtmlTextWriterTag.Td);
writer.Write("当前第");
if (_lblCurrentPage != null)
_lblCurrentPage.RenderControl(writer);
writer.Write("页,每页");
if (_lblPageSize != null)
...{
_lblPageSize.RenderControl(writer);
}
writer.Write("条纪录,总共");
if (_lblRecodeCount != null)
_lblRecodeCount.RenderControl(writer);
writer.Write("条纪录,共");
if (_lblPageCount != null)
_lblPageCount.RenderControl(writer);
writer.Write("页 [ ");
if (_lnkbtnFrist != null)
...{
if (PageIndex == 1) //如果是第一页，则第一页灰显，作用是避免不必要的点击造成没必要的数据传输
...{
_lnkbtnFrist.Enabled = false;
}
else
...{
_lnkbtnFrist.Enabled = true;
}
_lnkbtnFrist.RenderControl(writer);
}
writer.Write(" ");
if (_lnkbtnPre != null)
...{
if (PageIndex > 1) //如果当前页大于1，则上一页显示，否则灰显
...{
_lnkbtnPre.Enabled = true;
}
else
...{
_lnkbtnPre.Enabled = false;
}
_lnkbtnPre.RenderControl(writer);
}
writer.Write(" ");
if (_lblPageCount.Text == "")
...{
for (int i = 0; i < 10; i++)
...{
LinkButton lb = (LinkButton)this.FindControl("_page_" + i.ToString());
lb.Enabled = false;
lb.Text = (i + 1).ToString();
lb.RenderControl(writer);
writer.Write(" ");
}
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text);
int quot = PageIndex / 10;
int rema = PageIndex % 10;
if (pageCount < 10 || pageCount - PageIndex < 10)
...{
for (int i = quot * 10 + 1; i <= pageCount; i++)
...{
LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
lb2.Text = i.ToString();
if (i == PageIndex)
...{
lb2.Enabled = false;
lb2.Font.Bold = true;
lb2.ForeColor = Color.Red;
}
else
...{
lb2.Enabled = true;
}
lb2.RenderControl(writer);
writer.Write(" ");
}
}
else
...{
for (int i = quot * 10 + 1; i <= quot * 10 + 10; i++)
...{
LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
lb2.Text = i.ToString();
if (i == PageIndex)
...{
lb2.Enabled = false;
lb2.Font.Bold = true;
lb2.ForeColor = Color.Red;
}
else
...{
lb2.Enabled = true;
}
lb2.RenderControl(writer);
writer.Write(" ");
}
}
}
if (_lnkbtnNext != null)
...{
if (_lblPageCount.Text == "")
...{
_lnkbtnNext.Enabled = false;
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
if (PageIndex < pageCount)//如果当前页小于总页数，则下一页显示，否则灰显
...{
_lnkbtnNext.Enabled = true;
}
else
...{
_lnkbtnNext.Enabled = false;
}
}
_lnkbtnNext.RenderControl(writer);
}
writer.Write(" ");
if (_lnkbtnLast != null)
...{
if (_lblPageCount.Text == "")
...{
_lnkbtnLast.Enabled = false;
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
if (PageIndex == pageCount)//如果当前页为最后一页，则末页灰显
...{
_lnkbtnLast.Enabled = false;
}
else
...{
_lnkbtnLast.Enabled = true;
}
}
_lnkbtnLast.RenderControl(writer);
}
writer.Write(" ]跳转到第");
if (_txtPageIndex != null)
_txtPageIndex.RenderControl(writer);
writer.Write("页");
if (_btnChangePage != null)
_btnChangePage.RenderControl(writer);
writer.RenderEndTag();
writer.RenderEndTag();
//base.RenderContents(writer);
}
#endregion
}
}
上一篇文章《 千万级数据分页之二---一个简单的自定义分页控件》发布了一个分页控件的源码，但是这个分页控件的设计时支持不太好，出现了“未处理的异常，输入字符串的格式不正确”的错误，如下图所示：
原因是以下代码引起的异常：
int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
修改为以下代码后即显示正常，如图所示：
if (_lblPageCount.Text == "")
...{
_lnkbtnLast.Enabled = false;
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
if (PageIndex == pageCount)//如果当前页为最后一页，则末页灰显
...{
_lnkbtnLast.Enabled = false;
}
else
...{
_lnkbtnLast.Enabled = true;
}
}
二、增加“自动套用格式”：
一个设计完善友好的控件离不开设计时支持，其中ControlDesigner作为web服务器控件的设计器的基类，通过继承此类，你可以实现需要的设计时效果。如果你要继承类似Label这样的控件，可以通过继承LabelDesigner来实现相应的功能。而要实现”自动套用格式“，就要继承DesignerAutoFormat类，实现自定义样式。DesignerAutoFormat 是一个基类，如果你想为你的控件在设计时提供格式化的功能,你可以从此类派生,你必须实现Apply方法,此方法会将相关联的控件设置样式.
继承DesignerAutoFormat类，重写Apply(Control control)方法，实现两种样式，分别是“英文样式”和“符号样式”。
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web.UI;
using System.Web;
using System.Web.UI.Design;
using System.Web.UI.Design.WebControls;
using System.Web.UI.WebControls;
using System.Drawing;
namespace CustomControls
...{
public class AspNetPagerAutoFormat : DesignerAutoFormat
...{
public AspNetPagerAutoFormat(string name) : base(name) ...{ }
public override void Apply(Control control)
...{
if (control is AspNetPager)
...{
AspNetPager aspNetPager = (AspNetPager)control;
if (this.Name == "英文样式")
...{
aspNetPager.ButtonText = "Go";
aspNetPager.FirstPageText = "First";
aspNetPager.PrePageText = "Prev";
aspNetPager.NextPageText = "Next";
aspNetPager.EndPageText = "End";
aspNetPager.LabelStyle.ForeColor = Color.Blue;
aspNetPager.LabelStyle.Font.Bold = true;
aspNetPager.TextBoxStyle.CssClass = "blue_rounded";
aspNetPager.TextBoxStyle.Width = Unit.Parse("50px");
aspNetPager.PageSize = 20;
aspNetPager.RecordCount = 0;
}
else if (this.Name == "符号样式")
...{
aspNetPager.ButtonText = "转到";
aspNetPager.FirstPageText = "<font face=webdings color="red">9</font>";
aspNetPager.PrePageText = "<font face=webdings color="red">7</font>";
aspNetPager.NextPageText = "<font face=webdings color="red">8</font>";
aspNetPager.EndPageText = "<font face=webdings color="red">:</font>";
aspNetPager.LabelStyle.ForeColor = Color.Red;
aspNetPager.LabelStyle.Font.Bold = true;
aspNetPager.TextBoxStyle.CssClass = "blue_rounded";
aspNetPager.TextBoxStyle.Width = Unit.Parse("40px");
aspNetPager.PageSize = 40;
}
}
else
...{
throw new Exception("The method or operation is not implemented.");
}
}
}
}
继承ControlDesigner类，重写AutoFormats属性以实现自定义“自动套用格式”，其中给AspNetPagerDesigner类加上加上SupportsPreviewControl元数据,这样可以支持预览功能：
using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Web.UI.Design;
namespace CustomControls
...{
[SupportsPreviewControl(true)]
public class AspNetPagerDesigner : ControlDesigner
...{
private DesignerAutoFormatCollection _dafc;
public override DesignerAutoFormatCollection AutoFormats
...{
get
...{
if (_dafc == null)
...{
_dafc = new DesignerAutoFormatCollection();
_dafc.Add(new AspNetPagerAutoFormat("英文样式"));
_dafc.Add(new AspNetPagerAutoFormat("符号样式"));
}
return _dafc;
}
}
}
}
下面是设计时效果，把鼠标移动到控件上方，右上角就会出现一个黑三角，点击该三角，出现一个任务栏，点击“自动套用格式”，就会出现“自动套用格式”对话框，选取左边列表的任意一个样式，点确定即可。
其中套用”英文样式后效果如下：
套用“字符样式后效果如下：
三、数字分页效果的实现：
首先定义十个LinkButton,如下代码所示：
private LinkButton _page_0;
private LinkButton _page_1;
private LinkButton _page_2;
private LinkButton _page_3;
private LinkButton _page_4;
private LinkButton _page_5;
private LinkButton _page_6;
private LinkButton _page_7;
private LinkButton _page_8;
private LinkButton _page_9;
在CreateChildControls()方法中生成这些控件，并定义一个共同的点击事件“BtnChangePage_Click”，
_page_0 = new LinkButton();
_page_0.ID = "_page_0";
_page_0.Click += new EventHandler(CurrentPage_Click);
_page_1 = new LinkButton();
_page_1.ID = "_page_1";
_page_1.Click += new EventHandler(CurrentPage_Click);
_page_2 = new LinkButton();
_page_2.ID = "_page_2";
_page_2.Click += new EventHandler(CurrentPage_Click);
_page_3 = new LinkButton();
_page_3.ID = "_page_3";
_page_3.Click += new EventHandler(CurrentPage_Click);
_page_4 = new LinkButton();
_page_4.ID = "_page_4";
_page_4.Click += new EventHandler(CurrentPage_Click);
_page_5 = new LinkButton();
_page_5.ID = "_page_5";
_page_5.Click += new EventHandler(CurrentPage_Click);
_page_6 = new LinkButton();
_page_6.ID = "_page_6";
_page_6.Click += new EventHandler(CurrentPage_Click);
_page_7 = new LinkButton();
_page_7.ID = "_page_7";
_page_7.Click += new EventHandler(CurrentPage_Click);
_page_8 = new LinkButton();
_page_8.ID = "_page_8";
_page_8.Click += new EventHandler(CurrentPage_Click);
_page_9 = new LinkButton();
_page_9.ID = "_page_9";
_page_9.Click += new EventHandler(CurrentPage_Click);
_txtPageIndex = new TextBox();
_txtPageIndex.ID = "txtPageIndex";
_lblPageSize = new Label();
_lblPageSize.ID = "lblPageSize";
this.Controls.Add(_page_0);
this.Controls.Add(_page_1);
this.Controls.Add(_page_2);
this.Controls.Add(_page_3);
this.Controls.Add(_page_4);
this.Controls.Add(_page_5);
this.Controls.Add(_page_6);
this.Controls.Add(_page_7);
this.Controls.Add(_page_8);
this.Controls.Add(_page_9);
CurrentPage_Click事件的代码：
protected void CurrentPage_Click(object sender, EventArgs e)
...{
string strID = ((LinkButton)sender).ID;
if (strID != "")
...{
int pageIndex = 0;
int pageNum = PageIndex / 10;
try
...{
int pageNum2 = int.Parse(strID.Split('_')[2]);
if (pageNum2 == 0)
pageNum2 = 10;
pageIndex = pageNum2 + pageNum*10;
}
catch
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('非法的页码!');</script>");
return;
}
_lblCurrentPage.Text = pageIndex.ToString();
OnPageChanged(EventArgs.Empty);
}
}
然后绘制控件，根据总页数和当前页码显示10个数字页，比如当前页是23页，则显示21到30共十个页的页码。
if (_lblPageCount.Text == "")
...{
for (int i = 0; i < 10; i++)
...{
LinkButton lb = (LinkButton)this.FindControl("_page_" + i.ToString());
lb.Enabled = false;
lb.Text = (i + 1).ToString();
lb.RenderControl(writer);
writer.Write(" ");
}
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text);
int quot = PageIndex / 10;
int rema = PageIndex % 10;
//PageNum = quot * 10;
if (pageCount < 10 || pageCount - PageIndex < 10)
...{
for (int i = quot * 10 + 1; i <= pageCount; i++)
...{
LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
lb2.Text = i.ToString();
if (i == PageIndex)
...{
lb2.Enabled = false;
lb2.Font.Bold = true;
lb2.ForeColor = Color.Red;
}
else
...{
lb2.Enabled = true;
}
lb2.RenderControl(writer);
writer.Write(" ");
}
}
else
...{
for (int i = quot * 10 + 1; i <= quot * 10 + 10; i++)
...{
LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
lb2.Text = i.ToString();
if (i == PageIndex)
...{
lb2.Enabled = false;
lb2.Font.Bold = true;
lb2.ForeColor = Color.Red;
}
else
...{
lb2.Enabled = true;
}
lb2.RenderControl(writer);
writer.Write(" ");
}
}
}
设计时效果如下图所示：
分页效果如下：
控件的源码如下：
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
namespace CustomControls
...{
[Designer(typeof(AspNetPagerDesigner)),ToolboxData("<{0}:AspNetPager runat='server' PageSize='25' FirstPageText='首页' PrePageText='上一页' NextPageText='下一页' EndPageText='末页' ButtonText='GO'></{0}:AspNetPager>")]
public class AspNetPager : WebControl, INamingContainer
...{
属性块#region 属性块
private object baseState = null;
private object buttonStyleState = null;
private object textBoxStyleState = null;
private object labelStyleState = null;
private object linkButtonStyleState = null;
private LinkButton _lnkbtnFrist;
private LinkButton _lnkbtnPre;
private LinkButton _lnkbtnNext;
private LinkButton _lnkbtnLast;
private Label _lblCurrentPage;
private Label _lblRecodeCount;
private Label _lblPageCount;
private Label _lblPageSize;
private TextBox _txtPageIndex;
private Button _btnChangePage;
private LinkButton _page_0;
private LinkButton _page_1;
private LinkButton _page_2;
private LinkButton _page_3;
private LinkButton _page_4;
private LinkButton _page_5;
private LinkButton _page_6;
private LinkButton _page_7;
private LinkButton _page_8;
private LinkButton _page_9;
private static readonly object EventPageChange = new object();
[Category("Pagination"), Description("每页显示的纪录数"),
DefaultValue("25")]
public virtual int PageSize
...{
get
...{
EnsureChildControls();
return _lblPageSize.Text.Trim() != "" ? int.Parse(_lblPageSize.Text.Trim()) : 25;
}
set
...{
EnsureChildControls();
_lblPageSize.Text = value.ToString();
}
}
[Category("Pagination"), Description("总纪录数"),
DefaultValue("0"), Bindable(true)]
public virtual int RecordCount
...{
get
...{
EnsureChildControls();
return _lblRecodeCount.Text.Trim() != "" ? int.Parse(_lblRecodeCount.Text.Trim()) : 0;
}
set
...{
EnsureChildControls();
if (value > 0)
...{
int recodeCount = value;
_lblPageCount.Text = (value % PageSize == 0 ? value / PageSize : value / PageSize + 1).ToString();//计算总页数
}
_lblRecodeCount.Text = value.ToString();
}
}
[Category("Pagination"), Description("当前页码"),
DefaultValue("1"), Bindable(true)]
public virtual int PageIndex
...{
get
...{
EnsureChildControls();
return _lblCurrentPage.Text.Trim() != "" ? int.Parse(_lblCurrentPage.Text.Trim()) : 1;
}
set
...{
EnsureChildControls();
_lblCurrentPage.Text = value.ToString();
}
}
[Category("Appearance"), Description("设置第一页的文本"),
DefaultValue("首页"), Bindable(true)]
public virtual string FirstPageText
...{
get
...{
EnsureChildControls();
return _lnkbtnFrist.Text.Trim() != "" ? _lnkbtnFrist.Text.Trim() : "首页";
}
set
...{
EnsureChildControls();
_lnkbtnFrist.Text = value;
}
}
[Category("Appearance"), Description("设置上一页的文本"),
DefaultValue("上一页"), Bindable(true)]
public virtual string PrePageText
...{
get
...{
EnsureChildControls();
return _lnkbtnPre.Text.Trim() != "" ? _lnkbtnPre.Text.Trim() : "上一页";
}
set
...{
EnsureChildControls();
_lnkbtnPre.Text = value;
}
}
[Category("Appearance"), Description("设置下一页的文本"),
DefaultValue("下一页"), Bindable(true)]
public virtual string NextPageText
...{
get
...{
EnsureChildControls();
return _lnkbtnNext.Text.Trim() != "" ? _lnkbtnNext.Text.Trim() : "下一页";
}
set
...{
EnsureChildControls();
_lnkbtnNext.Text = value;
}
}
[Category("Appearance"), Description("设置末页的文本"),
DefaultValue("末页"), Bindable(true)]
public virtual string EndPageText
...{
get
...{
EnsureChildControls();
return _lnkbtnLast.Text.Trim() != "" ? _lnkbtnLast.Text.Trim() : "末页";
}
set
...{
EnsureChildControls();
_lnkbtnLast.Text = value;
}
}
[Category("Appearance"), Description("设置跳转按钮的文本"),
DefaultValue(":"), Bindable(true)]
public virtual string ButtonText
...{
get
...{
EnsureChildControls();
return _btnChangePage.Text.Trim() != "" ? _btnChangePage.Text.Trim() : "GO";
}
set
...{
EnsureChildControls();
_btnChangePage.Text = value;
}
}
#endregion
分页事件相关#region 分页事件相关
public event EventHandler PageChanged
...{
add
...{
Events.AddHandler(EventPageChange, value);
}
remove
...{
Events.RemoveHandler(EventPageChange, value);
}
}
protected void OnPageChanged(EventArgs e)
...{
EventHandler handler = (EventHandler)Events[EventPageChange];
if (handler != null)
...{
handler(this, e);
}
}
#endregion
样式属性#region 样式属性
private Style _buttonStyle;
private Style _textBoxStyle;
private Style _linkButtonStyle;
[
Category("Styles"),
DefaultValue(null),
DesignerSerializationVisibility(
DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty),
Description(
"应用于按钮的样式")
]
public virtual Style ButtonStyle
...{
get
...{
if (_buttonStyle == null)
...{
_buttonStyle = new Style();
if (IsTrackingViewState)
...{
((IStateManager)_buttonStyle).TrackViewState();
}
}
return _buttonStyle;
}
}
[
Category("Styles"),
DefaultValue(null),
DesignerSerializationVisibility(
DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty),
Description(
"应用于链接按钮的样式")
]
public virtual Style LinkButtonStyle
...{
get
...{
if (_linkButtonStyle == null)
...{
_linkButtonStyle = new Style();
if (IsTrackingViewState)
...{
((IStateManager)_linkButtonStyle).TrackViewState();
}
}
return _linkButtonStyle;
}
}
[
Category("Styles"),
DefaultValue(null),
DesignerSerializationVisibility(
DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty),
Description(
"应用于文本框的样式")
]
public virtual Style TextBoxStyle
...{
get
...{
if (_textBoxStyle == null)
...{
_textBoxStyle = new Style();
if (IsTrackingViewState)
...{
((IStateManager)_textBoxStyle).TrackViewState();
}
}
return _textBoxStyle;
}
}
private Style _labelStyle;
[
Category("Styles"),
DefaultValue(null),
DesignerSerializationVisibility(
DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty),
Description(
"应用于标签的样式")
]
public virtual Style LabelStyle
...{
get
...{
if (_labelStyle == null)
...{
_labelStyle = new Style();
if (IsTrackingViewState)
...{
((IStateManager)_labelStyle).TrackViewState();
}
}
return _labelStyle;
}
}
#endregion
自定义视图状态#region 自定义视图状态
protected override void LoadViewState(object savedState)
...{
if (savedState == null)
...{
base.LoadViewState(null);
return;
}
else
...{
Triplet t = savedState as Triplet;
if (t != null)
...{
base.LoadViewState(baseState);
if ((t.Second) != null)
...{
((IStateManager)ButtonStyle).LoadViewState(buttonStyleState);
}
if ((t.Third) != null)
...{
((IStateManager)TextBoxStyle).LoadViewState(textBoxStyleState);
}
if (labelStyleState != null)
...{
((IStateManager)(_labelStyle)).LoadViewState(labelStyleState);
}
if (linkButtonStyleState != null)
...{
((IStateManager)(_linkButtonStyle)).LoadViewState(linkButtonStyleState);
}
}
else
...{
throw new ArgumentException("Invalid view state .");
}
}
}
protected override object SaveViewState()
...{
baseState = base.SaveViewState();
buttonStyleState = null;
textBoxStyleState = null;
labelStyleState = null;
linkButtonStyleState = null;
if (_buttonStyle != null)
...{
buttonStyleState =
((IStateManager)_buttonStyle).SaveViewState();
}
if (_textBoxStyle != null)
...{
textBoxStyleState =
((IStateManager)_textBoxStyle).SaveViewState();
}
if (_labelStyle != null)
...{
labelStyleState = ((IStateManager)_labelStyle).SaveViewState();
}
if (_linkButtonStyle != null)
...{
linkButtonStyleState = ((IStateManager)_linkButtonStyle).SaveViewState();
}
return new Triplet(baseState,
buttonStyleState, textBoxStyleState);
}
protected override void TrackViewState()
...{
base.TrackViewState();
if (_buttonStyle != null)
...{
((IStateManager)_buttonStyle).TrackViewState();
}
if (_textBoxStyle != null)
...{
((IStateManager)_textBoxStyle).TrackViewState();
}
if (_labelStyle != null)
...{
((IStateManager)_labelStyle).TrackViewState();
}
if (_linkButtonStyle != null)
...{
((IStateManager)_linkButtonStyle).TrackViewState();
}
}
#endregion
生成控件#region 生成控件
protected override void CreateChildControls()
...{
this.Controls.Clear();
_btnChangePage = new Button();
_btnChangePage.ID = "btnChangePage";
_btnChangePage.Click += new EventHandler(BtnChangePage_Click);
_lblCurrentPage = new Label();
_lblCurrentPage.ID = "lblCurrentPage";
_lblPageCount = new Label();
_lblPageCount.ID = "lblPageCount";
_lblRecodeCount = new Label();
_lblRecodeCount.ID = "lblRecodeCount";
_lnkbtnFrist = new LinkButton();
_lnkbtnFrist.ID = "lnkbtnFrist";
_lnkbtnFrist.Click += new EventHandler(lnkbtnFrist_Click);
_lnkbtnLast = new LinkButton();
_lnkbtnLast.ID = "lnkbtnLast";
_lnkbtnLast.Click += new EventHandler(lnkbtnLast_Click);
_lnkbtnNext = new LinkButton();
_lnkbtnNext.ID = "lnkbtnNext";
_lnkbtnNext.Click += new EventHandler(lnkbtnNext_Click);
_lnkbtnPre = new LinkButton();
_lnkbtnPre.ID = "lnkbtnPre";
_lnkbtnPre.Click += new EventHandler(lnkbtnPre_Click);
_page_0 = new LinkButton();
_page_0.ID = "_page_0";
_page_0.Click += new EventHandler(CurrentPage_Click);
_page_1 = new LinkButton();
_page_1.ID = "_page_1";
_page_1.Click += new EventHandler(CurrentPage_Click);
_page_2 = new LinkButton();
_page_2.ID = "_page_2";
_page_2.Click += new EventHandler(CurrentPage_Click);
_page_3 = new LinkButton();
_page_3.ID = "_page_3";
_page_3.Click += new EventHandler(CurrentPage_Click);
_page_4 = new LinkButton();
_page_4.ID = "_page_4";
_page_4.Click += new EventHandler(CurrentPage_Click);
_page_5 = new LinkButton();
_page_5.ID = "_page_5";
_page_5.Click += new EventHandler(CurrentPage_Click);
_page_6 = new LinkButton();
_page_6.ID = "_page_6";
_page_6.Click += new EventHandler(CurrentPage_Click);
_page_7 = new LinkButton();
_page_7.ID = "_page_7";
_page_7.Click += new EventHandler(CurrentPage_Click);
_page_8 = new LinkButton();
_page_8.ID = "_page_8";
_page_8.Click += new EventHandler(CurrentPage_Click);
_page_9 = new LinkButton();
_page_9.ID = "_page_9";
_page_9.Click += new EventHandler(CurrentPage_Click);
_txtPageIndex = new TextBox();
_txtPageIndex.ID = "txtPageIndex";
_lblPageSize = new Label();
_lblPageSize.ID = "lblPageSize";
this.Controls.Add(_page_0);
this.Controls.Add(_page_1);
this.Controls.Add(_page_2);
this.Controls.Add(_page_3);
this.Controls.Add(_page_4);
this.Controls.Add(_page_5);
this.Controls.Add(_page_6);
this.Controls.Add(_page_7);
this.Controls.Add(_page_8);
this.Controls.Add(_page_9);
this.Controls.Add(_btnChangePage);
this.Controls.Add(_lblCurrentPage);
this.Controls.Add(_lblPageCount);
this.Controls.Add(_lblRecodeCount);
this.Controls.Add(_lnkbtnFrist);
this.Controls.Add(_lnkbtnLast);
this.Controls.Add(_lnkbtnNext);
this.Controls.Add(_lnkbtnPre);
this.Controls.Add(_txtPageIndex);
base.CreateChildControls();
}
#endregion
按钮点击事件#region 按钮点击事件
翻页相关的事件#region 翻页相关的事件
/**//// <summary>
/// 处理翻页事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkbtnFrist_Click(object sender, EventArgs e) //第一页
...{
_lblCurrentPage.Text = "1";
OnPageChanged(EventArgs.Empty);
}
protected void lnkbtnPre_Click(object sender, EventArgs e) //上一页
...{
int pageIndex = int.Parse(_lblCurrentPage.Text);
if (pageIndex > 0)
...{
pageIndex--;
_lblCurrentPage.Text = pageIndex.ToString();
OnPageChanged(EventArgs.Empty);
}
}
protected void lnkbtnNext_Click(object sender, EventArgs e)//下一页
...{
int pageIndex = int.Parse(_lblCurrentPage.Text);
int pageCount = int.Parse(_lblPageCount.Text);
if (pageIndex < pageCount)
...{
pageIndex++;
_lblCurrentPage.Text = pageIndex.ToString();
}
OnPageChanged(EventArgs.Empty);
}
protected void lnkbtnLast_Click(object sender, EventArgs e)//末页
...{
_lblCurrentPage.Text = _lblPageCount.Text;
OnPageChanged(EventArgs.Empty);
}
protected void CurrentPage_Click(object sender, EventArgs e)
...{
string strID = ((LinkButton)sender).ID;
if (strID != "")
...{
int pageIndex = 0;
int pageNum = PageIndex / 10;
try
...{
int pageNum2 = int.Parse(strID.Split('_')[2]);
if (pageNum2 == 0)
pageNum2 = 10;
pageIndex = pageNum2 + pageNum*10;
}
catch
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('非法的页码!');</script>");
return;
}
_lblCurrentPage.Text = pageIndex.ToString();
OnPageChanged(EventArgs.Empty);
}
}
#endregion
protected void BtnChangePage_Click(object sender, EventArgs e)//跳转到指定页
...{
int pageIndex = 0;
try
...{
pageIndex = int.Parse(_txtPageIndex.Text);
}
catch
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('请输入正确的页数!');</script>");
return;
}
int pageCount = int.Parse(_lblPageCount.Text);
if (pageIndex == 0)//如果为0，则提示错误
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('请输入正确的页数!');</script>");
return;
}
if (pageIndex > pageCount)//如果大于总页数则提示错误
...{
System.Web.HttpContext.Current.Response.Write("<Script>alert('请输入正确的页数!');</script>");
return;
}
_lblCurrentPage.Text = pageIndex.ToString();
OnPageChanged(EventArgs.Empty);
}
#endregion
重写TagKey#region 重写TagKey
protected override HtmlTextWriterTag TagKey
...{
get
...{
return HtmlTextWriterTag.Table;
}
}
#endregion
绘制控件#region 绘制控件
protected override void RenderContents(HtmlTextWriter writer)
...{
if (ButtonStyle != null)
...{
_btnChangePage.ApplyStyle(ButtonStyle);
}
if (TextBoxStyle != null)
...{
_txtPageIndex.ApplyStyle(TextBoxStyle);
}
if (LabelStyle != null)
...{
_lblCurrentPage.ApplyStyle(LabelStyle);
_lblPageCount.ApplyStyle(LabelStyle);
_lblRecodeCount.ApplyStyle(LabelStyle);
_lblPageSize.ApplyStyle(LabelStyle);
}
AddAttributesToRender(writer);
writer.RenderBeginTag(HtmlTextWriterTag.Tr);
writer.AddAttribute(HtmlTextWriterAttribute.Align, "right");
writer.RenderBeginTag(HtmlTextWriterTag.Td);
writer.Write("当前第");
if (_lblCurrentPage != null)
_lblCurrentPage.RenderControl(writer);
writer.Write("页,每页");
if (_lblPageSize != null)
...{
_lblPageSize.RenderControl(writer);
}
writer.Write("条纪录,总共");
if (_lblRecodeCount != null)
_lblRecodeCount.RenderControl(writer);
writer.Write("条纪录,共");
if (_lblPageCount != null)
_lblPageCount.RenderControl(writer);
writer.Write("页 [ ");
if (_lnkbtnFrist != null)
...{
if (PageIndex == 1) //如果是第一页，则第一页灰显，作用是避免不必要的点击造成没必要的数据传输
...{
_lnkbtnFrist.Enabled = false;
}
else
...{
_lnkbtnFrist.Enabled = true;
}
_lnkbtnFrist.RenderControl(writer);
}
writer.Write(" ");
if (_lnkbtnPre != null)
...{
if (PageIndex > 1) //如果当前页大于1，则上一页显示，否则灰显
...{
_lnkbtnPre.Enabled = true;
}
else
...{
_lnkbtnPre.Enabled = false;
}
_lnkbtnPre.RenderControl(writer);
}
writer.Write(" ");
if (_lblPageCount.Text == "")
...{
for (int i = 0; i < 10; i++)
...{
LinkButton lb = (LinkButton)this.FindControl("_page_" + i.ToString());
lb.Enabled = false;
lb.Text = (i + 1).ToString();
lb.RenderControl(writer);
writer.Write(" ");
}
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text);
int quot = PageIndex / 10;
int rema = PageIndex % 10;
if (pageCount < 10 || pageCount - PageIndex < 10)
...{
for (int i = quot * 10 + 1; i <= pageCount; i++)
...{
LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
lb2.Text = i.ToString();
if (i == PageIndex)
...{
lb2.Enabled = false;
lb2.Font.Bold = true;
lb2.ForeColor = Color.Red;
}
else
...{
lb2.Enabled = true;
}
lb2.RenderControl(writer);
writer.Write(" ");
}
}
else
...{
for (int i = quot * 10 + 1; i <= quot * 10 + 10; i++)
...{
LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
lb2.Text = i.ToString();
if (i == PageIndex)
...{
lb2.Enabled = false;
lb2.Font.Bold = true;
lb2.ForeColor = Color.Red;
}
else
...{
lb2.Enabled = true;
}
lb2.RenderControl(writer);
writer.Write(" ");
}
}
}
if (_lnkbtnNext != null)
...{
if (_lblPageCount.Text == "")
...{
_lnkbtnNext.Enabled = false;
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
if (PageIndex < pageCount)//如果当前页小于总页数，则下一页显示，否则灰显
...{
_lnkbtnNext.Enabled = true;
}
else
...{
_lnkbtnNext.Enabled = false;
}
}
_lnkbtnNext.RenderControl(writer);
}
writer.Write(" ");
if (_lnkbtnLast != null)
...{
if (_lblPageCount.Text == "")
...{
_lnkbtnLast.Enabled = false;
}
else
...{
int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
if (PageIndex == pageCount)//如果当前页为最后一页，则末页灰显
...{
_lnkbtnLast.Enabled = false;
}
else
...{
_lnkbtnLast.Enabled = true;
}
}
_lnkbtnLast.RenderControl(writer);
}
writer.Write(" ]跳转到第");
if (_txtPageIndex != null)
_txtPageIndex.RenderControl(writer);
writer.Write("页");
if (_btnChangePage != null)
_btnChangePage.RenderControl(writer);
writer.RenderEndTag();
writer.RenderEndTag();
//base.RenderContents(writer);
}
#endregion
}
}
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