使用Webclient.Uploadfile在文件上载期间获取上载进度

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进度条。 我将如何实现这一目标？

Answer 1

WebClient.UploadFileAsync将允许您这样做。

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，线程不会再在上传时阻止，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。