C#实现大文件分块发送到客户端

2022-07-15 80酷酷网 80kuku.com

　　客户端

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();
}
}