C# 如何使用FtpWebRequest显示上传进度条

C# 如何使用FtpWebRequest显示上传进度条,c#,winforms,ftp,progress-bar,ftpwebrequest,C#,Winforms,Ftp,Progress Bar,Ftpwebrequest,我正在使用FtpWebRequest将文件上载到ftp。我需要显示完成了多少工作的状态 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

我正在使用
FtpWebRequest
将文件上载到ftp。我需要显示完成了多少工作的状态

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;

    // 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();
}

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

基本思想是:

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;
}
确保启用了
WorkerReportsProgress

backgroundWorker2.WorkerReportsProgress = true;

使用
BackgroundWorker
您还可以轻松实现上传取消

请参阅,它允许您在GUI仍然响应的情况下运行耗时的任务,并提供进度/取消功能。

一个简单的FTP上载示例,使用
FtpWebRequest
和WinForms进度条,使用:

核心上传代码基于:

一种可取消的方法,使用异步/等待模式的IProgress接口,如果可用,利用。请参阅以确定您的场景是否符合条件。在打开流之前检查取消令牌,但在传输文件时,会将取消令牌卸载到流的异步方法

我很少做基准测试,但我怀疑这只在发送大文件时才实用。使用重叠I/O的性能可能会随着较小的文件,尤其是较小的缓冲区大小而降低

公共异步任务FtpAsync(字符串源文件、Uri destinationUri、字符串用户、SecureString密码、IProgress进程、CancellationToken令牌)
{
const int bufferSize=128*1024;//128kb缓冲区
进度报告(0米);
var request=(FtpWebRequest)WebRequest.Create(destinationUri);
request.Method=WebRequestMethods.Ftp.UploadFile;
request.Credentials=新的网络凭据(用户、密码);
token.ThrowIfCancellationRequested();
使用(var fileStream=newfilestream(sourceFile,FileMode.Open,FileAccess.Read,FileShare.Read,bufferSize,true))
{
使用(var ftpStream=await request.GetRequestStreamAsync())
{
var buffer=新字节[bufferSize];
int-read;
而((read=await fileStream.ReadAsync(buffer,0,buffer.Length,token))>0)
{
等待ftpStream.WriteAsync(缓冲区,0,读取,令牌);
变量百分比=100m*((十进制)fileStream.Position/fileStream.Length);
进度报告(百分比);
}
}
}
var response=(FtpWebResponse)等待请求。GetResponseAsync();
var success=(int)response.StatusCode>=200&(int)response.StatusCode<300;
response.Close();
如果(!成功)
抛出新异常(response.StatusDescription);
}

是的,但解决方案不太好上传3mb文件显示只有23%53,然后100@Afnan你可以根据自己的需要调整缓冲区的大小。这是一个只有边界链接的答案。您应该扩展您的答案,在此处包含尽可能多的信息,并使用该链接仅供参考。
private void button1_Click(object sender, EventArgs e)
{
    // Run Upload on background thread
    Task.Run(() => Upload());
}

private void Upload()
{
    string url = "ftp://ftp.example.com/remote/path/file.zip";
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(url);
    request.Credentials = new NetworkCredential("username", "password");
    request.Method = WebRequestMethods.Ftp.UploadFile;

    using (Stream fileStream = File.OpenRead(@"C:\local\path\file.zip"))
    using (Stream ftpStream = request.GetRequestStream())
    {
        progressBar1.Invoke(
            (MethodInvoker)delegate { 
                progressBar1.Maximum = (int)fileStream.Length; });

        byte[] buffer = new byte[10240];
        int read;
        while ((read = fileStream.Read(buffer, 0, buffer.Length)) > 0)
        {
            ftpStream.Write(buffer, 0, read);
            progressBar1.Invoke(
                (MethodInvoker)delegate {
                    progressBar1.Value = (int)fileStream.Position; });
        }
    }
}