将GridView显示的内容导出为Excel

1. 在页面文件里有一个GridView，假定ID为GridView_CheckStat

2. 用户访问到GridView显示的内容之后点击一个导出按钮

3. 方法如下：

引入：using System.IO;

/// <summary>
/// 导出为Excel
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>

protected void Button_ExportExcel_Click(object sender, EventArgs e)
{
string style = @"<style> .text { mso-number-format:\@; } </script> ";
Response.ClearContent();
Response.ContentEncoding = System.Text.Encoding.UTF7;
Response.AddHeader("content-disposition", "attachment; filename=ExcelFile.xls");
Response.ContentType = "application/ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
//假定我们要导出的GridView的ID为GridView_CheckStat
//导出前将GridView排序和分页都关闭
GridView_CheckStat.AllowPaging = false;
GridView_CheckStat.AllowSorting = false;
//从页面取到查询条件
string materialType = this.txtMaterialType.Text;
string depotType = this.DropDownList_DepotType.SelectedValue;
string depotId = this.DropDownList_Depot.SelectedValue;
string goodsName = this.txtGoodsName.Text.Trim();
//填充数据源
GridView_CheckStat.DataSource = CheckStatBll.getCheckStatByCondition(materialType, depotId, depotType, goodsName);
//绑定数据源
GridView_CheckStat.DataBind();
GridView_CheckStat.RenderControl(htw);
//Style为导出Excel时的格式（有个五六种吧，去网上查一下）
Response.Write(style);
Response.Write(sw.ToString());
Response.End();
//导出前将GridView分页打开
GridView_CheckStat.AllowPaging = true;
GridView_CheckStat.AllowSorting = false;
//重新绑定数据源
GridView_CheckStat.DataBind();
}

4. 导出Excel防止出错，重写一个方法

/// <summary>
/// 重写一下，导出为excel时不会报错
/// </summary>
/// <param name="control"></param>
public override void VerifyRenderingInServerForm(Control control)
{    }

5. 现在就可以让用户看到导出的Excel文件了。但是想要定义某一列显示的数据格式，如一列为money，一列为两位小数，或是一列为整数，一列为日期等，类似这些格式可以放在GridView的一个事件RowDataBound中来定义如下：

/// <summary>
/// GridView_CheckStat加入行变化样式
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>

protected void GridView_CheckStat_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//当鼠标在某一行上方时激发
e.Row.Attributes.Add("onmouseover", "curColor=this.style.backgroundColor;this.style.backgroundColor='#DDCCAA'");
//当鼠标从某一行上方移开时激发
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=curColor");
//导出Excel时文本化
//e.Row.Cells[1].Attributes.Add("class", "text");
//这里的[0]代表第一列
e.Row.Cells[0].Attributes.Add("style", "vnd.ms-excel.numberformat:@");
}
}