FileUpload.HasFile始终显示为false

问题描述：

Iam通过以下代码动态加载三个文件上传控件。FileUpload.HasFile始终显示为false

protected void Page_Load(object sender, EventArgs e) 
{   
     Table tblDocuments = new Table(); 
     tblDocuments.CellPadding=8; 
     tblDocuments.CellSpacing=8; 

     TableRow tr7 = new TableRow(); 

     TableCell tc13 = new TableCell(); 
     Label lblSRV=new Label(); 
     lblSRV.Text="SRV:"; 
     tc13.BackColor = System.Drawing.ColorTranslator.FromHtml("#4FB0B0"); 
     lblSRV.ForeColor=System.Drawing.Color.Black; 
     lblSRV.Font.Bold=true; 
     tc13.Controls.Add(lblSRV); 
     tr7.Cells.Add(tc13); 

     TableCell tc14 = new TableCell(); 
     fuUploadSRV.ID = "SRV"; 
     tc14.Controls.Add(fuUploadSRV); 
     tc14.HorizontalAlign = HorizontalAlign.Center; 
     tc14.VerticalAlign = VerticalAlign.Middle; 

     tr7.Cells.Add(tc14); 
     tblDocuments.Rows.Add(tr7); 

     TableRow tr8 = new TableRow(); 

     TableCell tc15 = new TableCell();   
     Label lblMAtrialCertificate = new Label(); 
     lblMAtrialCertificate.Text = "Material/Product Certificate:"; 
     lblMAtrialCertificate.ForeColor = System.Drawing.Color.Black; 
     lblMAtrialCertificate.Font.Bold = true; 
     tc15.BackColor = System.Drawing.ColorTranslator.FromHtml("#4FB0B0"); 
     tc15.Controls.Add(lblMAtrialCertificate); 
     tr8.Cells.Add(tc15); 

     TableCell tc16 = new TableCell(); 
     fuUploadMaterialCertificate.ID = "MaterialCertificate"; 
     tc16.Controls.Add(fuUploadMaterialCertificate); 
     tc16.HorizontalAlign = HorizontalAlign.Center; 
     tc16.VerticalAlign = VerticalAlign.Middle; 

     tr8.Cells.Add(tc16); 
     tblDocuments.Rows.Add(tr8); 


     TableRow tr9 = new TableRow(); 

     TableCell tc17 = new TableCell(); 
     Label lblPurchaseOrder = new Label(); 
     lblPurchaseOrder.Text = "Purchase Order:"; 
     lblPurchaseOrder.ForeColor = System.Drawing.Color.Black; 
     lblPurchaseOrder.Font.Bold = true; 
     tc17.BackColor = System.Drawing.ColorTranslator.FromHtml("#4FB0B0"); 
     tc17.Controls.Add(lblPurchaseOrder); 
     tr9.Cells.Add(tc17); 

     TableCell tc18 = new TableCell(); 
     fuUploadPurchaseOrder.ID="Purchase"; 
     tc18.Controls.Add(fuUploadPurchaseOrder); 
     tc18.HorizontalAlign = HorizontalAlign.Center; 
     tc18.VerticalAlign = VerticalAlign.Middle; 

     tr9.Cells.Add(tc18); 
     tblDocuments.Rows.Add(tr9); 

     placeSubmit.Controls.Add(tblDocuments);

}

荫处理的按钮单击事件

void btnSubmit_Click(object sender, EventArgs e) 
{ 

    if (fuUploadSRV.HasFile) 
     { 
      string srvFilename = Path.GetFileName(fuUploadSRV.PostedFile.FileName); 
      Stream fs = fuUploadSRV.PostedFile.InputStream; 
      int filesize = fuUploadSRV.PostedFile.ContentLength; 
      BinaryReader br = new BinaryReader(fs); 
      byte[] content = br.ReadBytes(filesize); 
      Objects.UpdateSRVFileDetails(srvFilename, content,txtSRV.Text.ToString().Trim()); 

     } 

     if (fuUploadMaterialCertificate.HasFile) 
     { 
      string materialFilename = Path.GetFileName(fuUploadMaterialCertificate.PostedFile.FileName); 
      Stream fs = fuUploadMaterialCertificate.PostedFile.InputStream; 
      int filesize = fuUploadMaterialCertificate.PostedFile.ContentLength; 
      BinaryReader br = new BinaryReader(fs); 
      byte[] content = br.ReadBytes(filesize); 
      Objects.UpdateMaterialCertificateFileDetails(materialFilename, content, txtSRV.Text.ToString().Trim()); 
     } 

     if (fuUploadPurchaseOrder.HasFile) 
     { 
      string poFilename = Path.GetFileName(fuUploadPurchaseOrder.PostedFile.FileName); 
      Stream fs = fuUploadPurchaseOrder.PostedFile.InputStream; 
      int filesize = fuUploadPurchaseOrder.PostedFile.ContentLength; 
      BinaryReader br = new BinaryReader(fs); 
      byte[] content = br.ReadBytes(filesize); 
      Objects.UpdatePurchaseOrderFileDetails(poFilename, content, txtPurchaseOrderNo.Text.ToString().Trim()); 
     }

}

现在在调试时，虽然我选择一个文件时，fuUploadSRV.HasFile，fuUploadMaterialCertificate文件.HasFile，fuUploadPurchaseOrder.HasFile总是返回false。

我错过了什么吗？

你是否实例化了你的新文件上传控件？正如我在你的代码中看到的，你只通过'fuUploadPurchaseOrder.ID =“Purchase”;'来声明它的id，但没有实例化。 – KevinIsNowOnline 2013-04-27 02:20:56

谢谢..我实例化所有的文件上传控件 – codewarrior 2013-04-27 02:35:46

我实例化所有控件外的Page_load ... – codewarrior 2013-04-27 02:40:52

答

您是否尝试更新<form runat="server"以包含enctype="multipart/form-data"？

没有它，奇怪的事情可能会发生！

雅...我做到了，但发生了什么事情是当我点击提交按钮，页面回来后，控制再次被创建。在这个过程中，选择的文件丢失了。页面加载事件首先发生，然后点击事件..我不知道如何捕捉文件。 – codewarrior 2013-04-27 05:22:53

我猜你的问题与每次回发没有完全重新建立你的控制状态有关。当您使用.NET控件动态创建页面时，必须确保在每次回发时完全重新创建控件状态。互联网上有很多资源可以涵盖此内容，包括此SO帖子，例如：http://stackoverflow.com/a/3945390/442472。 MSDN也涵盖了这一点。 – 2013-04-29 02:41:26

如果你不想重新创建控制状态，你也可以检查Request.Form []变量。请参阅http://stackoverflow.com/questions/4431407/get-file-upload-data-from-post-data-in-asp-net或http://stackoverflow.com/questions/1998452/accessing-input-type文件在服务器端在asp网络的讨论。 – 2013-04-29 12:35:30

答

文件上传控件位于更新面板中。当我删除更新面板时，控件按预测工作。但我知道更新面板如何起作用，但删除它已解决了我的问题。

我已经看到更新面板和发布文件的奇怪行为。如果可以的话，我尽量避免混合两者。 – Tim 2013-05-02 20:24:16

FileUpload.HasFile始终显示为false

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