学步园

经测试，有可能是这个问题：

导出Excel的代码：

 

    private void ExportToExcel()
    {
        Response.Clear();
        System.Web.HttpContext curContext = System.Web.HttpContext.Current;
        Response.AddHeader("content-disposition", "attachment;filename=Test.xls");
        //Response.Charset = "UTF-8";//设置字符集
        //curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;//设置编码集
        Response.Charset = "utf-8";
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        //Response.ContentType = "application/vnd.xls";
        Response.ContentType = "application/ms-excel";
        //ms-excel
        System.IO.StringWriter stringWrite = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
        //写到Excel的数据不用分页
      
        GridView1.RenderControl(htmlWrite);
        Response.Write(stringWrite.ToString());//向客户端写数据
        Response.End();
        GridView1.AllowSorting = true;
        //恢复分页       
    }

 如果将 Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");

设置成 UTF7则会出现题目中的问题 导致打开是乱码，改成GB2312就正常。