Question

asp.net中GridView 数据导出到excel表中怎么弄，说点详细的方法，越具体越好。

asp.net中GridView 数据导出到excel表中怎么弄，说点详细的方法，越具体越好。需要哪些命名空间。代码也行，要清楚点。赏分不是问题。

Answer 1

引用的别人的：
Gridview导出为Excel
尝试了一下Gridview导出为Excel，原本以为很简单，可是真正应用起来还是不太好弄的，呵呵，所想非所得。总结了一下应该注意下面几点：
1.由于gridview的内容可能是分页显示的，因此，这里在每次导出excel时，先将gridview的allowpaging属性设置为false，然后databind()一下，确保搂到所有数据；
2.不用单独设置导出的路径，导出时会弹出对话框让你确认保存位置；
3.要写一个空的VerifyRenderingInServerForm方法（必须写），以确认在运行时为指定的ASP.NET 服务器控件呈现HtmlForm 控件；
4.导出后别忘记再重新设置其allowpaging属性；
当我把这些都设置好以后，点击[导出]，出现了 只能在执行 Render() 的过程中调用 RegisterForEventValidation(RegisterForEventValidation can only be called during Render(); ) 的错误，又检查代码，没发现问题啊，搞了一会弄不出来，然后搜索了一下，发现了解决办法：
修改你的aspx文件中的：
<%@ Page Language="C#" EnableEventValidation = "false" AutoEventWireup="true" CodeFile="SysUser.aspx.cs" Inherits="Autho_SysUser2" %>
增加红色的部分就ok了。
下面是代码和截图：
#region 导出为Excel
public override void VerifyRenderingInServerForm(Control control)
{
// Confirms that an HtmlForm control is rendered for
}

private void ToExcel(Control ctl, string FileName)
{
HttpContext.Current.Response.Charset = "UTF-8";
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
HttpContext.Current.Response.ContentType = "application/ms-excel";
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + "" + FileName);
ctl.Page.EnableViewState = false;
System.IO.StringWriter tw = new System.IO.StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);
ctl.RenderControl(hw);
HttpContext.Current.Response.Write(tw.ToString());
HttpContext.Current.Response.End();
}

private void toExcelClk()
{
gvSysUser.AllowPaging = false;
gvSysUser.AllowSorting = false;
gvSysUser.DataBind();
ToExcel(gvSysUser, "OFS_Data.xls");
gvSysUser.AllowPaging = true;
gvSysUser.AllowSorting = true;
gvSysUser.DataBind();
}
#endregion

Answer 2

protected void Button1_Click(object sender, EventArgs e)
{
Export("application/ms-excel", "Employee information.xls");
}
/// <summary>
/// 定义导出Excel的函数
/// </summary>
/// <param name="FileType"></param>
/// <param name="FileName"></param>
private void Export(string FileType, string FileName)
{
Response.Charset = "GB2312";
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
Response.ContentType = FileType;
this.EnableViewState = false;
StringWriter tw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);
GridView1.RenderControl(hw);
Response.Write(tw.ToString());
Response.End();
}

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Answer 3

protected void Button1_Click(object sender, EventArgs e)
...{
Response.Clear();
Response.Buffer = true;
Response.Charset = "GB2312";
Response.AppendHeader("Content-Disposition", "attachment;filename=FileName.xls");
Response.ContentEncoding = System.Text.Encoding.UTF7;

//设置输出文件类型为excel文件。
Response.ContentType = "application/ms-excel";
System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
this.GridView1.RenderControl(oHtmlTextWriter);
Response.Output.Write(oStringWriter.ToString());
Response.Flush();
Response.End();
}