PRB: Response.WriteFile không th? t?i m?t t?p tin l?n

Aspnet_wp.exe (ho?c W3wp.exe cho các ?ng d?ng ch?y trên Microsoft Internet Information Services [II] 6.0) d?ng ð?t ng?t.

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• Có ðý?c các d? li?u trong ph?n nh?, và sau ðó di chuy?n d? li?u ð? d?ng su?i ð?u ra ð? t?i v?. Các m? sau ðây ch?ng t? làm th? nào ð? làm ði?u Ði?u này.
  
  Quan tr?ng Khi b?n thi?t l?p giá tr? c?a các g? l?i thu?c tính c?a nguyên t? t?ng h?p ð? sai trong t?p tin Web.config ASP c?a b?n.?ng d?ng m?ng, b?n ph?i thi?t l?p các Server.ScriptTimeout b?t ð?ng s?n cho m?t giá tr? thích h?p cho kích thý?c t?i v? t?p tin. Theo m?c ð?nh, các Server.ScriptTimeout giá tr? ðý?c thi?t l?p ð? 90 giây. Tuy nhiên, khi các g? l?i thu?c tính ðý?c ð?t thành s? th?t, các Server.ScriptTimeout giá tr? s? ðý?c ð?t r?t l?n 30,000,000 giây. Nhý là m?t nhà phát tri?n, b?n ph?i ðý?c nh?n th?c c?a các tác ð?ng này có th? có trên hành vi c?a ASP c?a b?n.NET Web ?ng d?ng.
  
  Ngoài ra, trong m? sau b?n ph?i ðý?c nh?n th?c c?a các các giá tr? tham s? ðý?c s? d?ng v?i các FileStream nhà xây d?ng. Các giá tr? ð?m r?ng ðang làm specifed cho m?t tác ð?ng ðáng k? v? các ch?c nãng mà ðý?c cung c?p. Cho thêm thông tin, tham kh?o các FileStream liên k?t trong cácTAÌI LIÊòU THAM KHAÒO keá tieáp.
  Th? giác Cõ b?n.NET Code

        Dim iStream As System.IO.Stream
  
        ' Buffer to read 10K bytes in chunk:
        Dim buffer(10000) As Byte
  
        ' Length of the file:
        Dim length As Integer
  
        ' Total bytes to read:
        Dim dataToRead As Long
  
        ' Identify the file to download including its path.
        Dim filepath As String = "DownloadFileName"
  
        ' Identify the file name.
        Dim filename As String = System.IO.Path.GetFileName(filepath)
  
        Try
           ' Open the file.
           iStream = New System.IO.FileStream(filepath, System.IO.FileMode.Open, _
                                                  IO.FileAccess.Read, IO.FileShare.Read)
  
           ' Total bytes to read:
           dataToRead = iStream.Length
           
           Response.ContentType = "application/octet-stream"
           Response.AddHeader("Content-Disposition", "attachment; filename=" & filename)
  
           ' Read the bytes.
              While dataToRead > 0
                  ' Verify that the client is connected.
                  If Response.IsClientConnected Then
                      ' Read the data in buffer
                      length = iStream.Read(buffer, 0, 10000)
  
                      ' Write the data to the current output stream.
                      Response.OutputStream.Write(buffer, 0, length)
  
                      ' Flush the data to the HTML output.
                      Response.Flush()
  
                      ReDim buffer(10000) ' Clear the buffer
                      dataToRead = dataToRead - length
                  Else
                      'prevent infinite loop if user disconnects
                      dataToRead = -1
                  End If
              End While
  
        Catch ex As Exception
           ' Trap the error, if any.
           Response.Write("Error : " & ex.Message)
        Finally
           If IsNothing(iStream) = False Then
              ' Close the file.
              iStream.Close()
           End If
           Response.Close()
        End Try
  

  Visual C#.NET Code

  	System.IO.Stream iStream = null;
  
  	// Buffer to read 10K bytes in chunk:
  	byte[] buffer = new Byte[10000];
  
  	// Length of the file:
  	int length;
  
  	// Total bytes to read:
  	long dataToRead;
  
  	// Identify the file to download including its path.
  	string filepath  = "DownloadFileName";
  
  	// Identify the file name.
  	string  filename  = System.IO.Path.GetFileName(filepath);
  
  	try
  	{
  		// Open the file.
  		iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, 
  					System.IO.FileAccess.Read,System.IO.FileShare.Read);
  
  
  		// Total bytes to read:
  		dataToRead = iStream.Length;
  
  		Response.ContentType = "application/octet-stream";
  		Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
  
  		// Read the bytes.
    		while (dataToRead > 0)
  		{
  			// Verify that the client is connected.
  			if (Response.IsClientConnected) 
  			{
  				// Read the data in buffer.
  				length = iStream.Read(buffer, 0, 10000);
  
  				// Write the data to the current output stream.
  				Response.OutputStream.Write(buffer, 0, length);
  
  				// Flush the data to the HTML output.
  				Response.Flush();
  
  				buffer= new Byte[10000];
  				dataToRead = dataToRead - length;
  			}
  			else
  			{
  				//prevent infinite loop if user disconnects
  				dataToRead = -1;
  			}
  		}
  	}
  	catch (Exception ex) 
  	{
  		// Trap the error, if any.
  		Response.Write("Error : " + ex.Message);
  	}
  	finally
  	{
  		if (iStream != null) 
  		{
  			//Close the file.
  			iStream.Close();
  		}
  		Response.Close();
  	}
  	

  Thay th? DownloadFileName v?i tên g?i c?a m?t t?p tin l?n hõn 100 megabyte (MB).
  
  - hay -
• Cung c?p m?t liên k?t cho ngý?i dùng ð? t?i xu?ng các t?p tin.
  
  - hay -
• S? d?ng Microsoft ASP 3.0 cho các t?i ho?c s? d?ng ph?n m?m Ngh? nhân FileUp v?i ASP.
  
  - hay -
• T?o m?t ph?n m? r?ng ISAPI ð? t?i v? các t?p tin.
  
  - hay -
• S? d?ng FTP ð? t?i các t?p tin.

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Các bý?c ð? t?o l?i hành vi

1. Trong Microsoft Visual Basic.NET hay trong Microsoft Visual C# .NET, t?o ra m?t d? án m?i ?ng d?ng Web. Theo m?c ð?nh, WebForm1.aspx là t?o ra.
2. Kéo m?t ð?i tý?ng nút t? h?p công c? ð? WebForm1.aspx.
3. B?m ðúp vào các ð?i tý?ng nút ð? m? các Nh?p vào s? ki?n trong Code View.
4. Dán m? sau ðây trong Button1 Nh?p vào s? ki?n.
   
   Visual Basic.NET Code

   	' Identify the file to download including its path.
   	Dim filepath As String = DownloadFileName
   
   	' Identify the file name.
   	Dim filename As String = System.IO.Path.GetFileName(filepath)
   
   	Response.Clear()
   	
   	' Specify the Type of the downloadable file.
   	Response.ContentType = "application/octet-stream"
   
   	' Set the Default file name in the FileDownload dialog box.
   	Response.AddHeader("Content-Disposition", "attachment; filename=""" & filename & """")
   
   	Response.Flush()
   
   	' Download the file.
   	Response.WriteFile(filepath)

   
   Visual C#.NET Code

   	// Identify the file to download including its path.
   	string filepath = DownloadFileName;
   
   	// Identify the file name.
   	string filename = System.IO.Path.GetFileName(filepath);
   
   	Response.Clear();
   
   	// Specify the Type of the downloadable file.
   	Response.ContentType = "application/octet-stream";
   
   	// Set the Default file name in the FileDownload dialog box.
   	Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
   
   	Response.Flush();
   
   	// Download the file.
   	Response.WriteFile(filepath);

5. Thay th? DownloadFileName v?i tên t?p l?n hõn 100 MB.
6. Trên các G? l?i tr?nh ðõn, nh?p vàoB?t ð?u.
7. Nh?p vào Button1.

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