在Response.Flush（）代码不起作用之后

Posted 2021-03-27

对不起，如果它太荒谬的问题。但是我有一个调用事件的asp按钮。 Event创建一个数据表并将数据表下载为xls。它工作正常，我可以看到下载的文件，但我看不到我显示数据表的gridview。有没有人对它有所了解。

            Response.ClearContent();
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1254");
            Response.Charset = "windows-1254"; 
            Response.AddHeader("content-disposition", attachment);
            Response.ContentType = "application/xsl";
            string tab = "";
            foreach (DataColumn c in dt.Columns)
            {
                Response.Write(tab + c.ColumnName);
                tab = "	";
            }

            \..somethings about writing to file ...

            HttpContext.Current.Response.Flush();
            HttpContext.Current.Response.SuppressContent = true; 
            HttpContext.Current.ApplicationInstance.CompleteRequest();

我尝试在response.flush（）之后创建数据表并导入到gridview。当我调试下面的代码时它工作正常。我可以在调试部分看到变量，但gridview仍然看不到。

            Response.ClearContent();
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1254");
            Response.Charset = "windows-1254"; 
            Response.AddHeader("content-disposition", attachment);
            Response.ContentType = "application/xsl";
            string tab = "";
            foreach (DataColumn c in dt.Columns)
            {
                Response.Write(tab + c.ColumnName);
                tab = "	";
            }

            \..somethings about writing to file ...

            HttpContext.Current.Response.Flush();
            HttpContext.Current.Response.SuppressContent = true; 
            HttpContext.Current.ApplicationInstance.CompleteRequest();
            queryString = textbox.Text.Replace("
", " ").ToString();
            table = connectDatabase(queryString);
            GridView1.DataSource = table;
            GridView1.DataBind();
            if (GridView1.Rows.Count > 0)
            {
                GridView1.Visible = true;
            }

答案

在你的情况下，你必须创建一个新的.aspx页面，让我们说“download.aspx”你将有下载代码，在你的主页面你可以有你的网格绑定代码，看下面的例子。

MainPage.aspx

btnGetData_click()
{
 dt=connectdb(query); 
 GridView1.DataSource = dt; 
 GridView1.DataBind(); 
 GridView1.Visible=true;

 Session("ExcelData") = dt;

 string url = "download.aspx";
 string s = "window.open('" + url + "', 'download_window', 'width=100,height=100,left=100,top=100,resizable=no');";
 ClientScript.RegisterStartupScript(this.GetType(), "script", s, true);

}

download.aspx

page_load()
{
  if(!IsPostBack)
  {
            DataTable dt = (DataTable)Session("ExcelData");
            Response.ClearContent();
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1254");
            Response.Charset = "windows-1254"; 
            Response.AddHeader("content-disposition", attachment);
            Response.ContentType = "application/xsl";
            string tab = "";
            foreach (DataColumn c in dt.Columns)
            {
                Response.Write(tab + c.ColumnName);
                tab = "	";
            }

            \..somethings about writing to file ...

            HttpContext.Current.Response.Flush();
            HttpContext.Current.Response.SuppressContent = true; 
            HttpContext.Current.ApplicationInstance.CompleteRequest();
  }

}