Asp.net(c#)实现多线程断点续传

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(); 

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(); 

}

本文转自linzheng 51CTO博客，原文链接:http://blog.51cto.com/linzheng/1081571