DownloadFileAsync:需要检查是否没有互联网连接或下载失败

问题描述

我有一段代码使用DownloadFileAsync下载文件.如果我断开互联网连接，则该按钮会单击，并且什么也没有发生.如果互联网断开以及下载失败，我想抛出一个异常.关于如何实现这一目标的任何想法 ?谢谢

I have a chunk of code that downloads a file using DownloadFileAsync. If I disconnect the internet the button clicks and nothing happens. I want to throw an exception if the internet is down and also if the download fails. Any ideas on how to achieve this ? Thanks

 Private Sub downloadFile(ByVal srcPath As String, ByVal destPath As String)
        Dim wClient As New System.Net.WebClient()
        AddHandler wClient.DownloadProgressChanged, AddressOf downloadFile_ProgressChanged
        wClient.DownloadFileAsync(New System.Uri(srcPath), destPath)
    End Sub

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