我们如何显示使用FtpWebRequest上传的进度条

• Z时代
• 2024-01-10
• 分类：问答

我正在使用将文件上传到ftp FtpWebRequest。我需要表明完成了多少工作。

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;
    // 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();
}

回答：

最简单的方法是使用BackgroundWorker代码并将其放入DoWork事件处理程序。并报告进度BackgroundWorker.ReportProgress。

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;
        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;
}

确保WorkerReportsProgress已启用

backgroundWorker2.WorkerReportsProgress = true;

有了BackgroundWorker您，您也可以轻松实现上传取消。

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