使用Webclient获取文件上载过程中的上传进度。上传文件

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。 我将如何去实现这一目标？

Answer 1

WebClient.UploadFileAsync将允许你这样做。

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

...

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

注意该线程将不会阻止上传了，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。