使用SSH.NET在ProgressBar中显示文件下载的进度

我想在ProgressBar上显示下载过程的ProgressBar 。 我尝试过这样的代码来上传 ，但我失败了。 这是我尝试失败的一个例子

 private void button5_Click(object sender, EventArgs e) { Task.Run(() => Download()); } private void Download() { try { int Port = (int)numericUpDown1.Value; string Host = comboBox1.Text; string Username = textBox3.Text; string Password = textBox4.Text; string SourcePath = textBox5.Text; string RemotePath = textBox6.Text; string FileName = textBox7.Text; using (var file = File.OpenWrite(SourcePath + FileName)) using (var Stream = new FileStream(SourcePath + FileName, FileMode.Open)) using (var Client = new SftpClient(Host, Port, Username, Password)) { Client.Connect(); progressBar1.Invoke((MethodInvoker) delegate { progressBar1.Maximum = (int)Stream.Length; }); Client.DownloadFile(RemotePath + FileName, /*file*/ Stream, DownloadProgresBar); Client.Disconnect(); } } catch (Exception Ex) { System.Windows.Forms.MessageBox.Show(Ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private void DownloadProgresBar(ulong Downloaded) { progressBar1.Invoke((MethodInvoker) delegate { progressBar1.Value = (int)Downloaded; }); } 

先感谢您

Answer 1

正如您所做的那样，与显示文件上载进度的代码类似，您必须提供对SftpClient.DownloadFile的downloadCallback参数的SftpClient.DownloadFile 。

 public void DownloadFile(string path, Stream output, Action downloadCallback = null) 

您也可以在后台线程上正确下载。 或者，您可以使用异步上载（ SftpClient.BeginDownloadFile ）。

有什么不对，需要你改变：

• 您必须打开/创建用于写入的本地文件（ FileMode.Create ）。
• 您必须检索远程文件的大小，而不是本地大小（尚不存在）。 使用SftpClient.GetAttributes 。

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使用后台线程的示例（任务）：

 private void button1_Click(object sender, EventArgs e) { // Run Download on background thread Task.Run(() => Download()); } private void Download() { try { int Port = 22; string Host = "example.com"; string Username = "username"; string Password = "password"; string RemotePath = "/remote/path/"; string SourcePath = @"C:\local\path\"; string FileName = "download.txt"; using (var stream = new FileStream(SourcePath + FileName, FileMode.Create)) using (var client = new SftpClient(Host, Port, Username, Password)) { client.Connect(); SftpFileAttributes attributes = client.GetAttributes(RemotePath + FileName); // Set progress bar maximum on foreground thread progressBar1.Invoke( (MethodInvoker)delegate { progressBar1.Maximum = (int)attributes.Size; }); // Download with progress callback client.DownloadFile(RemotePath + FileName, stream, DownloadProgresBar); MessageBox.Show("Download complete"); } } catch (Exception e) { MessageBox.Show(e.Message); } } private void DownloadProgresBar(ulong uploaded) { // Update progress bar on foreground thread progressBar1.Invoke((MethodInvoker)delegate { progressBar1.Value = (int)uploaded; }); } 

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上传请参阅：
使用SSH.NET在ProgressBar中显示文件上载的进度