GridView导出excel格式问题

在导出的点击事件中，代码如下：

//指定导出对应单元格为文本样式

string style = @"<style> .test { vnd.ms-excel.numberformat:@; } </style> ";
Response.ClearContent();          
Response.AddHeader("content-disposition", "attachment; filename=MyExcelFile.xls");
Response.ContentType = "application/excel";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gvwCheckExcepton.RenderControl(htw);
Response.Write(style);//输出样式
Response.Write(sw.ToString());//输出内容
Response.End();

在 gridview事件为RowDataBound指定哪些列需要指定格式

protected void gvwCheckExcepton_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Cells[0].Attributes.Add("class", "test");//前面参数是类，后面参数是样式test是上面样式定义的名称,相当于class=test;
            e.Row.Cells[1].Attributes.Add("class", "test");
            e.Row.Cells[2].Attributes.Add("class", "test");
        }
    }

如果绑定错误，需要在后台类里添加这个方法

public override void VerifyRenderingInServerForm(Control control)
    {
        
    }