如何在C＃中从数据库下载文件后显示消息框？ [英] How Do I Show Message Box After Downloading The File From Database In C#?

问题描述

 protected void GridView1_RowCommand（object sender，GridViewCommandEventArgs e）
 {
 if（e.CommandName ==Download）
 {
 byte [ ] byteimg = null; 
 byte [] byteimg1 = null; 
 bool replica = false; 
 GridViewRow gvrow =（GridViewRow）（（ImageButton）e.CommandSource）.NamingContainer; 
 string id = gvrow.Cells [0] .Text; 
 string servername = gvrow.Cells [2] .Text; 
 string filename = gvrow.Cells [1] .Text; 
 string f1 = filename.Replace（''，'_'）; 
 string ext = Path.GetExtension（filename）; 
 Random rnd = new Random（）; 
 int random = rnd.Next（0,9）; 
 
 if（servername ==S1）
 {
 if（random == 0 || random == 6 || random == 9 || random == 3 || random == 1 || random == 7）
 {
  ScriptManager.RegisterStartupScript（this，this.GetType（），，alert（'服务器已崩溃.. '）;，真实）;  
 byteimg1 = db.getbytesreplica1（id）; 
 replica = true; 
} 
 else 
 {
 byteimg = db.getbytes1（id）; 
} 
 
} 
 else if（servername ==S2）
 {
 byteimg1 = db.getbytesreplica2（id）; 
 byteimg = db.getbytes2（id）; 
 
} 
 else if（servername ==S3）
 {
 byteimg1 = db.getbytesreplica3（id）; 
 byteimg = db.getbytes3（id）; 
 
} 
 else 
 {
 byteimg1 = db.getbytesreplica4（id）; 
 byteimg = db.getbytes4（id）; 
} 
 
 if（ext ==。pdf）
 {
 Response.ContentType =application / pdf; 
} 
 
 else if（ext ==。doc|| ext ==。rtf|| ext ==。docx）
 {
 Response.ContentType =Application / msword; 
} 
 
 else if（ext ==。txt）
 {
 Response.ContentType =text / Plain; 
} 
 
 else if（ext ==.rar）
 {
 Response.ContentType =Application / x-rar-compressed; 
} 
 else if（ext ==。jpeg|| ext ==.jpg）
 {
 Response.ContentType =image / jpeg; 
 divmsg.InnerHtml =asd; 
} 
 
 else if（ext ==。png）
 {
 Response.ContentType =image / png; 
} 
 else 
 {
 Response.ContentType =Application / octetstream; 
} 
 popup.Show（）; 
 Response.AddHeader（Content-disposition，attachment; filename =+ f1）; 
 // Response.AppendHeader（Content-disposition，filename.ToString（））; 
 if（replica）
 {
 
 Response.BinaryWrite（byteimg1）; 
} 
 else 
 {
 Response.BinaryWrite（byteimg）; 
} 
 Response.Flush（）; 
 Response.End（）; 
} 
 
 
} 
 

上面的scriptmanager代码是没有注意，也没有弹出消息....请帮助我。

我也使用ModalPopupcontrol扩展器来显示消息，但它仍然没有显示消息......

i已将剧本管理员放入Bold ..上面的代码

提前谢谢.. !! ：）

解决方案

以上代码中发生的情况是，当文件下载完成时，您的响应将结束，因此您无法在下载文件后收到此消息。

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
   {
       if (e.CommandName == "Download")
       {
           byte[] byteimg = null;
           byte[] byteimg1 = null;
           bool replica = false;
           GridViewRow gvrow = (GridViewRow)((ImageButton)e.CommandSource).NamingContainer;
           string id = gvrow.Cells[0].Text;
           string servername = gvrow.Cells[2].Text;
           string filename = gvrow.Cells[1].Text;
           string f1=filename.Replace(' ', '_');
           string ext = Path.GetExtension(filename);
           Random rnd = new Random();
           int random = rnd.Next(0, 9);

           if (servername == "S1")
           {
               if (random == 0 || random == 6 || random == 9 || random == 3 || random == 1 || random == 7)
               {
                   ScriptManager.RegisterStartupScript(this, this.GetType(), "", "alert('Server has been crashed.. ');", true); 
                   byteimg1 = db.getbytesreplica1(id);
                   replica = true;
                }
               else
               {
                   byteimg = db.getbytes1(id);
               }

           }
           else if (servername == "S2")
           {
               byteimg1 = db.getbytesreplica2(id);
               byteimg = db.getbytes2(id);

           }
           else if (servername == "S3")
           {
               byteimg1 = db.getbytesreplica3(id);
               byteimg = db.getbytes3(id);

           }
           else
           {
               byteimg1 = db.getbytesreplica4(id);
               byteimg = db.getbytes4(id);
           }

           if (ext == ".pdf")
           {
               Response.ContentType = "application/pdf";
           }

           else if (ext == ".doc" || ext == ".rtf" || ext == ".docx")
           {
               Response.ContentType = "Application/msword";
           }

           else if (ext == ".txt")
           {
               Response.ContentType = "text/Plain";
           }

           else if (ext == ".rar")
           {
               Response.ContentType = "Application/x-rar-compressed";
           }
           else if (ext == ".jpeg" || ext == ".jpg")
           {
               Response.ContentType = "image/jpeg";
               divmsg.InnerHtml = "asd";
           }

           else if (ext == ".png")
           {
               Response.ContentType = "image/png";
           }
           else
           {
               Response.ContentType = "Application/octetstream";
           }
           popup.Show();
          Response.AddHeader("Content-disposition", "attachment; filename=" + f1);
          // Response.AppendHeader("Content-disposition", filename.ToString());
           if (replica)
           {

               Response.BinaryWrite(byteimg1);
           }
           else
           {
               Response.BinaryWrite(byteimg);
           }
           Response.Flush();
           Response.End();
       }


   }

Above code of scriptmanager is not worng and not popping up the message....plz help me with that.
I have also used ModalPopupcontrol extender to show the message but it still does not shows the message......
i have put the scriptmanager in Bold..in above code
Thanks in advance..!! :)

解决方案

well what happen in above code that when file download is complete your response will be end so you cant get such message once the file is download.

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