自己写的一个分页控件 WebPager

两个类文件，点这里下载DLL文件>WebPager.dll
1、 WebPager.cs

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

[assembly:TagPrefix("WebPager", "wp")]
namespace Xiaoqiao.Controls.WebPager
{
public delegate void WebPagerEventHandler(object sender, EventArgs e);
/// <summary>
/// WebPager 的摘要说明。
/// </summary>
[ DefaultProperty("CurrentPageIndex") ]
[ ToolboxData("<{0}:WebPagerControl runat=server></{0}:WebPagerControl>") ]
[ Designer("Xiaoqiao.Controls.WebPager.WebPagerDesigner") ]
[ ParseChildren(false) ]
public class WebPagerControl : WebControl,INamingContainer,IPostBackEventHandler
{
int m_CurrentPageIndex = 0;
int m_PageCount = 0;
int m_PageSize = 1;
int m_RecordCount = 0;
int m_NavNums = 10;
System.Drawing.Color m_CurrentPageNumColor = System.Drawing.Color.Red;
System.Collections.Specialized.NameValueCollection _aa;

string m_FirstPageText = "|<";
string m_PrevPageText = "<<";
string m_NextPageText = ">>";
string m_LastPageText = ">|";

//定义事件代理
public event WebPagerEventHandler PageChange;
public WebPagerControl()
{
}
protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
if ( m_PageCount==0 )
{
base.Render(writer);
return;
}
int n = m_NavNums;
int r = m_CurrentPageIndex%n;
int startIndex = (m_CurrentPageIndex-r)/n * n;
int endIndex = startIndex + n - 1;

if (endIndex>=m_PageCount)
endIndex = m_PageCount-1;

if ( m_PageCount==1||m_CurrentPageIndex==0 )
{
writer.Write(m_FirstPageText);
writer.Write(" ");
writer.Write(m_PrevPageText);
writer.Write(" ");
}
else
{
writer.AddAttribute(HtmlTextWriterAttribute.Href,"javascript:"+Page.GetPostBackEventReference(this,"0"));
writer.RenderBeginTag(HtmlTextWriterTag.A);
writer.Write(m_FirstPageText);
writer.RenderEndTag();
writer.Write(" ");
writer.AddAttribute(HtmlTextWriterAttribute.Href,"javascript:"+Page.GetPostBackEventReference(this,(m_CurrentPageIndex-1).ToString()));
writer.RenderBeginTag(HtmlTextWriterTag.A);
writer.Write(m_PrevPageText);
writer.RenderEndTag();
writer.Write(" ");
}

for ( int i=startIndex;i<=endIndex;i++ )
{
string s = i.ToString();
if ( m_CurrentPageIndex==i )
{
writer.Write("["+(i+1).ToString()+"]");
writer.Write(" ");
}
else
{
writer.AddAttribute(HtmlTextWriterAttribute.Href,"javascript:"+Page.GetPostBackEventReference(this,s));
writer.RenderBeginTag(HtmlTextWriterTag.A);
writer.Write("["+(i+1).ToString()+"]");
writer.RenderEndTag();
writer.Write(" ");
}
}

if ( m_PageCount==1||m_CurrentPageIndex==(m_PageCount-1) )
{
writer.Write(m_NextPageText);
writer.Write(" ");
writer.Write(m_LastPageText);
}
else
{
writer.AddAttribute(HtmlTextWriterAttribute.Href,"javascript:"+Page.GetPostBackEventReference(this,(m_CurrentPageIndex+1).ToString()));
writer.RenderBeginTag(HtmlTextWriterTag.A);
writer.Write(m_NextPageText);
writer.RenderEndTag();
writer.Write(" ");
writer.AddAttribute(HtmlTextWriterAttribute.Href,"javascript:"+Page.GetPostBackEventReference(this,(m_PageCount-1).ToString()));
writer.RenderBeginTag(HtmlTextWriterTag.A);
writer.Write(m_LastPageText);
writer.RenderEndTag();
}

string inputId = this.ClientID+"_pagenum";
writer.AddAttribute(HtmlTextWriterAttribute.Type,"text");
writer.AddAttribute(HtmlTextWriterAttribute.Size,"3");
writer.AddAttribute(HtmlTextWriterAttribute.Id,inputId);
writer.AddAttribute(HtmlTextWriterAttribute.Value,(m_CurrentPageIndex+1).ToString());
writer.RenderBeginTag(HtmlTextWriterTag.Input);
writer.RenderEndTag();
writer.AddAttribute(HtmlTextWriterAttribute.Onclick,"javascript:"+this.ClientID+"_GoToPage();");
writer.AddAttribute(HtmlTextWriterAttribute.Type,"button");
writer.AddAttribute(HtmlTextWriterAttribute.Value,"go");
writer.RenderBeginTag(HtmlTextWriterTag.Input);
writer.RenderEndTag();

base.Render(writer);
}

private void OnPageChange(object sender, EventArgs e)
{
this.ViewState["CurrentPageIndex"] = m_CurrentPageIndex;
if (PageChange != null)
PageChange(sender,e);
}

protected override void OnLoad(EventArgs e)
{
object state;

state = this.ViewState["CurrentPageIndex"];
if (state != null)
m_CurrentPageIndex = Convert.ToInt32(state);

state = this.ViewState["RecordCount"];
if (state != null)
this.RecordCount = Convert.ToInt32(state);

string inputId = this.ClientID+"_pagenum";
string scriptKey = "webpager_script";
if ( !Page.IsClientScriptBlockRegistered(scriptKey) )
{
string script = "<script language=javascript>function "+this.ClientID+"_GoToPage(){";
script += "var gotoPage=parseInt(document.getElementById('"+inputId+"').value);";
script += "if (isNaN(gotoPage)){alert('请输入正确的页码');return;}";
script += "if ( gotoPage>"+m_PageCount+"||gotoPage<1 ){alert('页码超出范围');return;}gotoPage--;";
script += "__doPostBack('"+this.ClientID+"',gotoPage)"+";";//Page.GetPostBackEventReference(this,"gotoPage")+";";
script += "}</script>";
Page.RegisterClientScriptBlock(scriptKey,script);
}

base.OnLoad(e);
}

public int CurrentPageIndex
{
get { return m_CurrentPageIndex; }
set { m_CurrentPageIndex = value; }
}
public int RecordCount
{
get
{
return m_RecordCount;
}
set
{
int i = value;
this.ViewState["RecordCount"] = i;
m_PageCount = GetPages(i,m_PageSize);
m_RecordCount = i;
}
}
public int PageSize
{
get
{
return m_PageSize;
}
set
{
int i = value;
if (i>0)
{
m_PageCount = GetPages(m_RecordCount,i);
m_PageSize = i;
}
else
throw(new Exception("PageSize必须大于零"));
}
}
private int GetPages(int Total,int PageSize)
{
int i = Total;
int t;
if ( (i%PageSize)==0 )
t = i/PageSize;
else
t = (int)(i-i%PageSize)/PageSize+1;
return t;
}

public int NavNums
{
get
{
return m_NavNums;
}
set
{
int i = value;
if (i>0)
m_NavNums = value;
}
}
public string FirstPageText
{
get
{
return m_FirstPageText;
}
set
{
m_FirstPageText = value;
}
}
public string PrevPageText
{
get
{
return m_PrevPageText;
}
set
{
m_PrevPageText = value;
}
}
public string NextPageText
{
get
{
return m_NextPageText;
}
set
{
m_NextPageText = value;
}
}
public string LastPageText
{
get
{
return m_LastPageText;
}
set
{
m_LastPageText = value;
}
}
public System.Drawing.Color CurrentPageNumColor
{
get
{
return m_CurrentPageNumColor;
}
set
{
m_CurrentPageNumColor = value;
}
}

public System.Collections.Specialized.NameValueCollection aa
{
get { return _aa; }
set { _aa = value; }
}

#region IPostBackEventHandler 成员

public void RaisePostBackEvent(string eventArgument)
{
// TODO: 添加 WebPagerControl.RaisePostBackEvent 实现
CurrentPageIndex = int.Parse(eventArgument);
OnPageChange(this,null);
}

#endregion
}
}

2、WebPagerDesigner.cs

using System;
using System.Globalization;

namespace Xiaoqiao.Controls.WebPager
{
/// <summary>
/// WebPagerDesigner 的摘要说明。
/// </summary>
public class WebPagerDesigner : System.Web.UI.Design.ControlDesigner
{
public WebPagerDesigner()
{
}
public override string GetDesignTimeHtml()
{
WebPagerControl oControl = (WebPagerControl)Component ;
return String.Format( CultureInfo.InvariantCulture,
"<table width=\"{0}\" height=\"{1}\" bgcolor=\"#f5f5f5\" bordercolor=\"#c7c7c7\" cellpadding=\"0\" cellspacing=\"0\" border=\"1\"><tr><td valign=\"middle\" align=\"center\">WebPagerControl - <b>{2}</b></td></tr></table>",
oControl.Width,
oControl.Height,
oControl.ID ) ;
}
}
}