手把手教你如何扩展GridView之自带Excel和Word导出

在web应用程序中，我们是不是很发愁打印问题，您是不是有过为了打印写Activex的经历，我们有没有想过，Word和Excel的打印功能能被我们利用起来呢?只要我们将我们将数据导出到Excel或者Word中，打印岂不是小case了么。下面就谈谈如何让GridView自己支持导出Excel和Word 。 首先增加了两个属性，用于指示是否支持Excel导出和Word导出

//增加了一个设置是否显示“导出Word”按钮的属性

/**//// <summary>

/// 排序提示信息

/// </summary>

[

Description("显示导出到Word"),

Category("扩展"),

DefaultValue(true)

]

public virtual bool ShowExportWord

{

get

{

object obj2 = this.ViewState["ShowExportWord"];

if (obj2 != null)

{

return (bool)obj2;

}

return true;

}

set

{

bool aShowExportWord = this.ShowExportWord;

if (value != aShowExportWord)

{

this.ViewState["ShowExportWord"] = value;

if (base.Initialized)

{

base.RequiresDataBinding = true;

}

}

}

}

//增加了一个设置是否显示“导出Excel”按钮的属性

[

Description("显示导出到Excel"),

Category("扩展"),

DefaultValue(true)

]

public virtual bool ShowExportExcel

{

get

{

object obj2 = this.ViewState["ShowExportExcel"];

if (obj2 != null)

{

return (bool)obj2;

}

return true;

}

set

{

bool aShowExportExcel = this.ShowExportExcel;

if (value != aShowExportExcel)

{

this.ViewState["ShowExportExcel"] = value;

if (base.Initialized)

{

base.RequiresDataBinding = true;

}

}

}

}

声明两个LinkButton控件btnExportWord,btnExport，分别用于点击导出Excel和点击导出word,并在控件的OnInit事件中初始化两个控件

LinkButton btnExportWord;

LinkButton btnExport; protected override void OnInit(EventArgs e)

{

this.EnableViewState = true;

btnExport = new LinkButton();

btnExport.CommandName = "ExportToExcel";

btnExport.EnableViewState = true;

btnExport.Text = "导出Excel";

btnExportWord = new LinkButton();

btnExportWord.CommandName = "ExportToWord";

btnExportWord.EnableViewState = true;

btnExportWord.Text = "导出Word";

base.OnInit(e);

将两个LinkButton添加到GridView子控件中。

protected override int CreateChildControls(System.Collections.IEnumerable dataSource, bool dataBinding) {

int res = base.CreateChildControls(dataSource, dataBinding);

try

{

GridViewRow row = new GridViewRow(0, 0, DataControlRowType.Pager, DataControlRowState.Normal);  TableCell cell2 = new TableCell();

cell2.HorizontalAlign = HorizontalAlign.Right;

cell2.Wrap = false; if (this.ShowExportExcel == true)

{

l1 = new Literal();

l1.Text = " [";

cell2.Controls.Add(l1);

cell2.Controls.Add(btnExport);

l1 = new Literal();

l1.Text = "] ";

cell2.Controls.Add(l1);

}

if (this.ShowExportWord == true)

{

l1 = new Literal();

l1.Text = " [";

cell2.Controls.Add(l1);

cell2.Controls.Add(btnExportWord);

l1 = new Literal();

l1.Text = "] ";

cell2.Controls.Add(l1);

} r.Cells.Add(cell2);

this.Controls[0].Controls.AddAt(0, row);

}

catch

{

}

}

return res;

}

在导出的时候，我们希望一些列不被导出，如修改，删除这样的列，因此我们添加了这样的一个属性

string _UnExportedColumnNames = "";

[

Description("不导出的数据列集合,将HeaderText用,隔开"),

Category("扩展"),

DesignerSerializationVisibility(DesignerSerializationVisibility.Content),

PersistenceMode(PersistenceMode.InnerProperty)

]

public string UnExportedColumnNames

{

get

{

return _UnExportedColumnNames;

}

set

{

_UnExportedColumnNames = value;

}

}

在导出的时候，原来的GridView列表中会有一些LinkButton或者DropDownList控件，导出的时候，我们也希望将其换成纯文本，用下面这个函数可以完成这个目的

private void DisableControls(Control gv)

{

LinkButton lb = new LinkButton();

Literal l = new Literal();

string name = String.Empty;

for (int i = 0; i < gv.Controls.Count; i++)

{

if (gv.Controls[i].GetType() == typeof(LinkButton))

{

l.Text = (gv.Controls[i] as LinkButton).Text;

gv.Controls.Remove(gv.Controls[i]);

gv.Controls.AddAt(i, l);

}

else if (gv.Controls[i].GetType() == typeof(DropDownList))

{

l.Text = (gv.Controls[i] as DropDownList).SelectedItem.Text;

gv.Controls.Remove(gv.Controls[i]);

gv.Controls.AddAt(i, l);

}

if (gv.Controls[i].HasControls())

{

DisableControls(gv.Controls[i]);

}

}

}

下面是处理ItemCommand，将GridView导出的代码

protected override void OnRowCommand(GridViewCommandEventArgs e)

{

base.OnRowCommand(e);

if (e.CommandName == "ExportToExcel")

{

string[] ss = UnExportedColumnNames.Split(',');

System.Collections.Generic.List<string> list = new System.Collections.Generic.List<string>();

foreach (string s in ss)

{

if (s != ",")

{

list.Add(s);

}

}

ShowToolBar = false;

this.AllowSorting = false;

HttpContext.Current.Response.Clear();

HttpContext.Current.Response.AddHeader("content-disposition",

"attachment;filename=" + ExcelFileName + ".xls");

HttpContext.Current.Response.Charset = "GB2312";

HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文

HttpContext.Current.Response.ContentType = "application/ms-excel";

System.IO.StringWriter stringWrite = new System.IO.StringWriter();

System.Web.UI.HtmlTextWriter htmlWrite =

new HtmlTextWriter(stringWrite);

bool showCheckAll = ShowCheckAll;

this.ShowCheckAll = false;

this.AllowPaging = false;

OnBind();

DisableControls(this);

foreach (DataControlField c in this.Columns)

{

if (list.Contains(c.HeaderText) && !string.IsNullOrEmpty(c.HeaderText))

{

c.Visible = false;

}

}

this.RenderControl(htmlWrite);

string content = System.Text.RegularExpressions.Regex.Replace(stringWrite.ToString(), "(<a[^>]+>)|(</a>)", "");

HttpContext.Current.Response.Write(content);

HttpContext.Current.Response.End();

this.AllowPaging = true;

this.AllowSorting = true;

ShowToolBar = true;

this.ShowCheckAll = showCheckAll;

OnBind();

}

else if (e.CommandName == "ExportToWord")

{

string[] ss = UnExportedColumnNames.Split(',');

System.Collections.Generic.List<string> list = new System.Collections.Generic.List<string>();

foreach (string s in ss)

{

if (s != ",")

{

list.Add(s);

}

}

ShowToolBar = false;

this.AllowSorting = false;

HttpContext.Current.Response.Clear();

HttpContext.Current.Response.AddHeader("content-disposition",

"attachment;filename=" + ExcelFileName + ".doc");

HttpContext.Current.Response.Charset = "GB2312";

HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文

HttpContext.Current.Response.ContentType = "application/ms-word";

System.IO.StringWriter stringWrite = new System.IO.StringWriter();

System.Web.UI.HtmlTextWriter htmlWrite =

new HtmlTextWriter(stringWrite);

bool showCheckAll = ShowCheckAll;

this.ShowCheckAll = false;

this.AllowPaging = false;

OnBind();

DisableControls(this);

foreach (DataControlField c in this.Columns)

{

if (list.Contains(c.HeaderText) && !string.IsNullOrEmpty(c.HeaderText))

{

c.Visible = false;

}

}

this.RenderControl(htmlWrite);

string content = System.Text.RegularExpressions.Regex.Replace(stringWrite.ToString(), "(<a[^>]+>)|(</a>)", "");

HttpContext.Current.Response.Write(content);

HttpContext.Current.Response.End();

this.AllowPaging = true;

this.AllowSorting = true;

ShowToolBar = true;

ShowCheckAll = showCheckAll;

OnBind();

}

}

使用的时候，只要指定ShowExportExcel=True，ShowExportWord=True就自动出现导出Word和导出Excel的按钮了，点击自动会将GridView中的数据导出到Word或者Excel中了，如果原GridView是多页的，那也会自动将全部数据（而不是当前页的数据）导出，而且会剔除原来数据中的一些超级链接。使用起来相当简单，效果页非常好。