C＃：FTP上传缓冲区大小 [英] C# : FTP upload buffer size

问题描述

我已经去了FTP上传功能，但有一些我想问一下
这是缓冲区大小，我把它设置为20KB这意味着什么，如果我增加/减少它是什么？

  private void Upload（string filename）
 {
 FileInfo fi = new FileInfo（filename） ; 
 
 FtpWebRequest ftp =（FtpWebRequest）FtpWebRequest.Create（ftp：//+ textBox1.Text +/+ Path.GetFileName（filename））; 
 ftp.Credentials = new NetworkCredential（textBox2.Text，textBox3.Text）; 
 ftp.Method = WebRequestMethods.Ftp.UploadFile; 
 ftp.UseBinary = true; 
 ftp.KeepAlive = false; 
 ftp.ContentLength = fi.Length; 
 
 //缓冲区大小设置为20kb 
 int buffLength = 20480; 
 byte [] buff = new byte [buffLength]; 
 int contentLen; 
 
 // int totalReadBytesCount = 0; 
 
 FileStream fs = fi.OpenRead（）; 
 
尝试
 {
 //要上传文件的流
 Stream strm = ftp.GetRequestStream（）; 
 
 //一次从文件流2kb读取
 contentLen = fs.Read（buff，0，buffLength）; 
 
 //直到流内容结束
 while（contentLen！= 0）
 {
 //将文件流中的内容写入
 // FTP上传流
 strm.Write（buff，0，contentLen）; 
 contentLen = fs.Read（buff，0，buffLength）; 
} 
 
 //关闭文件流和请求流
 strm.Close（）; 
 fs.Close（）; 
 
 $ b catch（Exception ex）
 {
 MessageBox.Show（ex.Message，Upload Error）; 
} 
} 
  

解决方案

桌面系统上的FTP大小约为256Kb，在我们的测试中产生了最佳性能。小缓冲区大小会显着降低传输速度。我建议你自己做一些测量，但对于缓冲区来说20Kb肯定太少了。

I have go that FTP Upload function , but there is something that i want to ask about It is the Buffer size , i set it to 20KB what does it mean and would it make difference if i increased/decreased it ?

    private void Upload(string filename)
    {
        FileInfo fi = new FileInfo(filename);

        FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create("ftp://" + textBox1.Text + "/" + Path.GetFileName(filename));
        ftp.Credentials = new NetworkCredential(textBox2.Text, textBox3.Text);
        ftp.Method = WebRequestMethods.Ftp.UploadFile;
        ftp.UseBinary = true;
        ftp.KeepAlive = false;
        ftp.ContentLength = fi.Length;

        // The buffer size is set to 20kb
        int buffLength = 20480;
        byte[] buff = new byte[buffLength];
        int contentLen;

        //int totalReadBytesCount = 0;

        FileStream fs = fi.OpenRead();

        try
        {
            // Stream to which the file to be upload is written
            Stream strm = ftp.GetRequestStream();

            // Read from the file stream 2kb at a time
            contentLen = fs.Read(buff, 0, buffLength);

            // Till Stream content ends
            while (contentLen != 0)
            {
                // Write Content from the file stream to the 
                // FTP Upload Stream
                strm.Write(buff, 0, contentLen);
                contentLen = fs.Read(buff, 0, buffLength);
            }

            // Close the file stream and the Request Stream
            strm.Close();
            fs.Close();

        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "Upload Error");
        }
    }

解决方案

For FTP on desktop systems block size of about 256Kb produced the best performance in our tests. Small buffer sizes decrease speed of transfer significantly. I recommend that you do some measurements yourself, but 20Kb is definitely too little for a buffer.

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