将gridview 的数据导出EXCEL

gridview数据



单击“导出EXCEL”按钮后



1.在上面的代码中，先将gridview绑定到指定的数据源中，然后在button按钮（用来做导出到EXCEL的）的事件中，写入相关的代码。

2.使用Response.AddHeader("content-disposition","attachment;filename= exporttoexcel.xls");中的filename来指定将要导出的excel的文件名，
3.这里是exporttoexcel.xls。要注意的是，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,
4. 然后通过页面流的方式导出当前页的gridview到excel中，最后再重新设置其allowpaging属性。另外要注意的是，要写一个空的VerifyRenderingInServerForm方法（必须写），

/// <summary>
/// 导EXCEL
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnExcel_Click(object sender, EventArgs e)
{
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
Response.Charset = "gb2312";
Response.ContentType = "application/vnd.xls";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

gvValueList.AllowPaging = false;
fun.GvDataInit(sql.selEntryTable, gvValueList, ddlMonth.SelectedValue.Trim());//绑定GV
gvValueList.RenderControl(htmlWrite);

Response.Write(stringWrite.ToString());
Response.End();
gvValueList.AllowPaging = true;
fun.GvDataInit(sql.selEntryTable, gvValueList, ddlMonth.SelectedValue.Trim());//绑定GV
}

/// <summary>
/// 导出EXCEL，要写一个空的VerifyRenderingInServerForm方法
/// </summary>
/// <param name="control"></param>
public override void VerifyRenderingInServerForm(Control control)
{
// Confirms that an HtmlForm control is rendered for
}

/// <summary>
/// 绑定GridView数据
/// </summary>
/// <param name="sqlID"></param>
/// <param name="gv"></param>
public void GvDataInit(string sqlID, GridView gv, string Condition1)
{
try
{
DataTable dt = null;

dt = BLL.SQLHandler.SearchData(sqlID, Condition1);

if (dt != null && dt.Rows.Count > 0)
{
gv.DataSource = dt;
}
else
{
gv.PageIndex = 0;
}

gv.DataBind();

}
catch (Exception ex)
{
gv.PageIndex = 0;
throw ex;

}
}

若报错提示如下：

报RegisterForEventValidation can only be called during Render()错误 .

将

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AddEntrytable.aspx.cs" Inherits="AddEntrytable" %>
修改为

<%@ Page Language="C#" EnableEventValidation="false" AutoEventWireup="true" CodeFile="AddEntrytable.aspx.cs" Inherits="AddEntrytable" %>

方二：

protected void btnExcel_Click(object sender, EventArgs e)
{
gvValueList.AllowPaging = false;
databind();

ToExcel(this.gvValueList, System.Web.HttpUtility.UrlEncode("test.xls", System.Text.Encoding.UTF8));
//Response.Clear();
//Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
//Response.Charset = "gb2312";
//Response.ContentType = "application/vnd.xls";
//System.IO.StringWriter stringWrite = new System.IO.StringWriter();
//System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

//gvValueList.AllowPaging = false;
//databind();
//gvValueList.RenderControl(htmlWrite);

//Response.Write(stringWrite.ToString());
//Response.End();
//gvValueList.AllowPaging = true;
//databind();
}
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();
}

public override void VerifyRenderingInServerForm(Control control)
{
// Confirms that an HtmlForm control is rendered for
}