我们如何显示使用FtpWebRequest进行上传的进度条 [英] How can we show progress bar for upload with FtpWebRequest

问题描述

我使用 FtpWebRequest 将文件上传到ftp。我需要显示已完成工作的状态。

到目前为止，我的代码是：

  public void Upload（string filename，string url）
 {
 FileInfo fileInf = new FileInfo（filename）; 
 string uri =ftp：//+ url +/+ fileInf.Name; 
 FtpWebRequest reqFTP; 
 // string uri =ftp：//+ Host +/ public_html / testing / blogtest /+ fileInf.Name; 
 
 //从Uri提供的
创建FtpWebRequest对象reqFTP =（FtpWebRequest）FtpWebRequest.Create（new Uri（uri））; 
 
 //提供WebPermission Credintials 
 reqFTP.Credentials = new NetworkCredential（Username，Password）; 
 
 //默认情况下，KeepAlive为true，控制连接未关闭
 //执行命令后。 
 reqFTP.KeepAlive = false; 
 //reqFTP.UsePassive = true; 
 //指定要执行的命令。 
 reqFTP.Method = WebRequestMethods.Ftp.UploadFile; 
 
 //指定数据传输类型。 
 reqFTP.UseBinary = true; 
 
 //通知服务器上传文件的大小
 reqFTP.ContentLength = fileInf.Length; 
 
 //缓冲区大小设置为2kb 
 int buffLength = 2048; 
 byte [] buff = new byte [buffLength]; 
 int contentLen; 
 
 //打开一个文件流（System.IO.FileStream）来读取要上传的文件
 FileStream fs = fileInf.OpenRead（）; 
 
 //将要上载的文件写入的流
 Stream strm = reqFTP.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（）; 
 
  

解决方案

最简单的方法是使用 BackgroundWorker 并将代码放入 DoWork 事件处理程序中。并报告 BackgroundWorker.ReportProgress 。

的基本思路：

  private void backgroundWorker1_DoWork（object sender，DoWorkEventArgs e）
 {
 var ftpWebRequest =（FtpWebRequest）WebRequest.Create（ftp：// example。 COM）; 
 ftpWebRequest.Method = WebRequestMethods.Ftp.UploadFile; 
 using（var inputStream = File.OpenRead（fileName））
 using（var outputStream = ftpWebRequest.GetRequestStream（））
 {
 var buffer = new byte [1024 * 1024] ; 
 int totalReadBytesCount = 0; 
 int readBytesCount; （（readBytesCount = inputStream.Read（buffer，0，buffer.Length））> 0）
 {
 outputStream.Write（buffer，0，readBytesCount）; 
 totalReadBytesCount + = readBytesCount; 
 var progress = totalReadBytesCount * 100.0 / inputStream.Length; 
 backgroundWorker1.ReportProgress（（int）progress）; 
 
 
 
 $ b private void backgroundWorker1_ProgressChanged（object sender，ProgressChangedEventArgs e）
 {
 progressBar.Value = e.ProgressPercentage; 
} 
  

确保 WorkerReportsProgress 已启用

  backgroundWorker2.WorkerReportsProgress = true; 
  

通过 BackgroundWorker ，您还可以轻松实现上传消除。

I am uploading files to ftp using FtpWebRequest. I need to show the status that how much is done.

So far my code is:

public void Upload(string filename, string url)
{
    FileInfo fileInf = new FileInfo(filename);
    string uri = "ftp://" + url + "/" + fileInf.Name;
    FtpWebRequest reqFTP;
    //string uri = "ftp://" + Host + "/public_html/testing/blogtest/" + fileInf.Name;

    // Create FtpWebRequest object from the Uri provided
    reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));

    // Provide the WebPermission Credintials
    reqFTP.Credentials = new NetworkCredential(Username, Password);

    // By default KeepAlive is true, where the control connection is not closed
    // after a command is executed.
    reqFTP.KeepAlive = false;
    //reqFTP.UsePassive = true;
    // Specify the command to be executed.
    reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

    // Specify the data transfer type.
    reqFTP.UseBinary = true;

    // Notify the server about the size of the uploaded file
    reqFTP.ContentLength = fileInf.Length;

    // The buffer size is set to 2kb
    int buffLength = 2048;
    byte[] buff = new byte[buffLength];
    int contentLen;

    // Opens a file stream (System.IO.FileStream) to read the file to be uploaded
    FileStream fs = fileInf.OpenRead();

    // Stream to which the file to be upload is written
    Stream strm = reqFTP.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();
}

解决方案

The easiest is to use BackgroundWorker and put your code into DoWork event handler. And report progress with BackgroundWorker.ReportProgress.

The basic idea:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    var ftpWebRequest = (FtpWebRequest)WebRequest.Create("ftp://example.com");
    ftpWebRequest.Method = WebRequestMethods.Ftp.UploadFile;
    using (var inputStream = File.OpenRead(fileName))
    using (var outputStream = ftpWebRequest.GetRequestStream())
    {
        var buffer = new byte[1024 * 1024];
        int totalReadBytesCount = 0;
        int readBytesCount;
        while ((readBytesCount = inputStream.Read(buffer, 0, buffer.Length)) > 0)
        {
            outputStream.Write(buffer, 0, readBytesCount);
            totalReadBytesCount += readBytesCount;
            var progress = totalReadBytesCount * 100.0 / inputStream.Length;
            backgroundWorker1.ReportProgress((int)progress);
        }
    }
}

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    progressBar.Value = e.ProgressPercentage;
}

Make sure WorkerReportsProgress is enabled

backgroundWorker2.WorkerReportsProgress = true;

With BackgroundWorker you can also easily implement upload cancellation.

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