Question

在form1设计器中我有一个backgroundworker，我在设计器中将WorkerReportsProgress和WorkerSupportsCancellation设置为true。

我在form1 designer中有一个progressBar1。

两个backgorundworker事件：DoWork和ProgressChanged。在DoWork事件中，我调用的方法是从另一个类上传ftp文件：

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            uploadftp.upload(@"c:\temp\FtpTestFile.txt", false);
        }

在form1构造函数中，我正在启动backgroundworker：

backgroundWorker1.RunWorkerAsync();

这是uploadftp类中的upload方法：

public void upload(string filename, bool uploadtosubortoroot)
    {
        try
        {
            FtpWebRequest request = null;
            if (uploadtosubortoroot == true)
            {
                request = (FtpWebRequest)FtpWebRequest.Create(
                host + "/" + directory + "/" + Path.GetFileName(filename));
            }
            else
            {
                request = (FtpWebRequest)FtpWebRequest.Create(
                host + "/" + Path.GetFileName(filename));
            }
            request.Method = WebRequestMethods.Ftp.UploadFile;
            request.Credentials = new NetworkCredential(user, pass);
            StreamReader sourceStream = new StreamReader(filename);
            byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
            sourceStream.Close();
            request.ContentLength = fileContents.Length;
            Stream requestStream = request.GetRequestStream();
            requestStream.Write(fileContents, 0, fileContents.Length);
            requestStream.Close();
            FtpWebResponse response = (FtpWebResponse)request.GetResponse();
            Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription);

            response.Close();
        }
        catch (Exception err)
        {
            string t = err.ToString();
        }    
    }

我想要做的是当文件上传时，progressBar将从0％开始进度到100％，其中0％是开始上传的时候，100％是完成上传文件的时候。

在上传方法中，我没有找到任何已注册的已完成事件，因此它会告诉我该文件已上传并已完成。

编辑：

这是我到目前为止所尝试的：

在form1中，我在按钮点击事件中添加了一个按钮：

private void button3_Click(object sender, EventArgs e)
        {
            backgroundWorker1.RunWorkerAsync();
        }

在backgorundworker DoWork活动中的form1中我做了：

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            uploadftp.upload(@"c:\temp\FtpTestFile.txt", false, (BackgroundWorker)sender);
        }

在ProgressChanged事件中，我做了：

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar1.Value = e.ProgressPercentage;
        }

backgorundworker完成的活动仍然是空的。

在上传方法的课程中，我做了：

public void upload(string filename, bool uploadtosubortoroot,BackgroundWorker bworker)
    {
        try
        {
            FtpWebRequest request = null;
            if (uploadtosubortoroot == true)
            {
                request = (FtpWebRequest)FtpWebRequest.Create(
                host + "/" + directory + "/" + Path.GetFileName(filename));
            }
            else
            {
                request = (FtpWebRequest)FtpWebRequest.Create(
                host + "/" + Path.GetFileName(filename));
            }
            request.Method = WebRequestMethods.Ftp.UploadFile;
            request.Credentials = new NetworkCredential(user, pass);
            StreamReader sourceStream = new StreamReader(filename);
            byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
            sourceStream.Close();
            request.ContentLength = fileContents.Length;
            Stream requestStream = request.GetRequestStream();
            requestStream.Write(fileContents, 0, fileContents.Length);
            bworker.ReportProgress(0, "Uploading file...");
            requestStream.Close();
            FtpWebResponse response = (FtpWebResponse)request.GetResponse();
            Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription);

            response.Close();
        }
        catch (Exception err)
        {
            string t = err.ToString();
        }    
    }

但它永远不会报告或没有进展。

Answer 1

将BackgroundWorker的引用传递给Upload方法为BackgroundWorker：

的事件创建事件处理程序

.ReportProgress - 执行方法ReportProgress时更新进度条 MSDN BackgroundWorker.ReportProgress Method (Int32, Object)

.RunWorkerCompleted - 在执行DoWork事件的事件处理程序后更新进度条

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    uploadftp.upload(@"c:\temp\FtpTestFile.txt", false, (BackgroundWorker)sender);
}

public void upload(string filename, 
                   bool uploadtosubortoroot, 
                   BackgroundWorker bworker)
{
    try
    {
        //I assume your progressbar.MaxValue = 100
        bworker.ReportProgress(0);
        FtpWebRequest request = null;
        if (uploadtosubortoroot == true)
        {
            request = (FtpWebRequest)FtpWebRequest.Create(
            host + "/" + directory + "/" + Path.GetFileName(filename));
        }
        else
        {
            request = (FtpWebRequest)FtpWebRequest.Create(
            host + "/" + Path.GetFileName(filename));
        }
        request.Method = WebRequestMethods.Ftp.UploadFile;
        request.Credentials = new NetworkCredential(user, pass);
        bworker.ReportProgress(20);
        StreamReader sourceStream = new StreamReader(filename);
        byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
        sourceStream.Close();
        request.ContentLength = fileContents.Length;
        Stream requestStream = request.GetRequestStream();
        requestStream.Write(fileContents, 0, fileContents.Length);
        requestStream.Close();
        bworker.ReportProgress(50);
        FtpWebResponse response = (FtpWebResponse)request.GetResponse();
        Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription);

        response.Close();
        bworker.ReportProgress(100);
    }
    catch (Exception err)
    {
        string t = err.ToString();
    }    
}

如何使用ftp文件上传的backgroundworker和progressbar？

1 个答案: