c# - 使用 Webclient.Uploadfile 在文件上传期间获取上传进度

Question

我有一个使用 webclient 将文件上传到服务器的应用程序。我想在文件上传过程中显示一个进度条。我将如何实现这一目标？

Answer 1

WebClient.UploadFileAsync将允许您执行此操作。

WebClient webClient = new WebClient();
webClient.UploadFileAsync(address, fileName);
webClient.UploadProgressChanged += WebClientUploadProgressChanged;

...

void WebClientUploadProgressChanged(object sender, UploadProgressChangedEventArgs e)
{
        Console.WriteLine("Upload {0}% complete. ", e.ProgressPercentage);
}

请注意，线程不会再阻止上传，所以我建议使用：

 webClient.UploadFileCompleted += WebClientUploadCompleted;

...

 void WebClientUploadCompleted(object sender, UploadFileCompletedEventArgs e)
 {
     // The upload is finished, clean up
 }

Answer 2

将您的事件处理程序添加到 WebClient.UploadProgressChanged 并调用 WebClient.UploadFileAsync。

有关示例，请参阅WebClient.UploadProgressChanged文档。