Asp.net(c#)实现多线程断点续传代码,Asp.Net代码库,德仔网

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【Asp.Net】 Asp.net(c#)实现多线程断点续传

作者: / 发布于2010/12/31/ 842

实现多线程断点续传

<div>System.IO.Stream iStream = null; 
 // Buffer to read 10K bytes in chunk: 
 byte[] buffer = new Byte[10240]; 
 // Length of the file: 
 int length; 
 // Total bytes to read: 
 long dataToRead; 
 // Identify the file to download including its path. 
 string filepath = @"E:\software\SQL Server 2000 Personal Edition.ISO"; 
 // 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); 
 Response.Clear(); 
 // Total bytes to read: 
 dataToRead = iStream.Length; 
 long p = 0; 
 if(Request.Headers["Range"]!=null) 
 { 
 Response.StatusCode = 206; 
 p = long.Parse( Request.Headers["Range"].Replace("bytes=","").Replace("-","")); 
 } 
 if(p != 0) 
 { 
 Response.AddHeader("Content-Range","bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString()); 
 } 
 Response.AddHeader("Content-Length",((long)(dataToRead-p)).ToString()); 
 Response.ContentType = "application/octet-stream"; 
 Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(filename))); 
 iStream.Position = p; 
 dataToRead = dataToRead - p; 
 // 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, 10240); 
 // 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[10240]; 
 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.End(); 
 } 
</div>

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　断点续传　

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