如何在.net上设置WebClient超时

Question

我下载了一些文件，但我也想为web客户端设置超时。正如我所看到的，没有任何变化，只是我们可以使用重写WebRequest。我已经做了，但不起作用。我的意思是GetWebRequest方法的重写不起作用。。这是我的代码

  public class VideoDownloader : Downloader
{
    /// <summary>
    /// Initializes a new instance of the <see cref="VideoDownloader"/> class.
    /// </summary>
    /// <param name="video">The video to download.</param>
    /// <param name="savePath">The path to save the video.</param>
    public VideoDownloader(VideoInfo video, string savePath)
        : base(video, savePath)
    { }

    /// <summary>
    /// Starts the video download.
    /// </summary>
    public override void Execute()
    {
        // We need a handle to keep the method synchronously
        var handle = new ManualResetEvent(false);
        var client = new WebClient();

        client.DownloadFileCompleted += (sender, args) => handle.Set();
        client.DownloadProgressChanged += (sender, args) =>
        this.OnProgressChanged(new ProgressEventArgs(args.ProgressPercentage));
        this.OnDownloadStarted(EventArgs.Empty);
      client.DownloadFileAsync(new Uri(this.Video.DownloadUrl), this.SavePath);
        handle.WaitOne();
        handle.Close();

        this.OnDownloadFinished(EventArgs.Empty);
    }
    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest w = base.GetWebRequest(address);
        w.Timeout = 10*1000; // 20 * 60 * 1000;
        return w;
    }
}

和下载类

 public abstract class Downloader: WebClient
{
    /// <summary>
    /// Initializes a new instance of the <see cref="Downloader"/> class.
    /// </summary>
    /// <param name="video">The video to download/convert.</param>
    /// <param name="savePath">The path to save the video/audio.</param>
    protected Downloader(VideoInfo video, string savePath)
    {
        this.Video = video;
        this.SavePath = savePath;
    }
    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest w = base.GetWebRequest(address);
        w.Timeout = 10 * 1000; // 20 * 60 * 1000;
        return w;
    }
    /// <summary>
    /// Occurs when the download finished.
    /// </summary>
    public event EventHandler DownloadFinished;
    /// <summary>
    /// Occurs when the download is starts.
    /// </summary>
    public event EventHandler DownloadStarted;
    /// <summary>
    /// Occurs when the progress has changed.
    /// </summary>
    public event EventHandler<ProgressEventArgs> ProgressChanged;
    /// <summary>
    /// Gets the path to save the video/audio.
    /// </summary>
    public string SavePath { get; private set; }
    /// <summary>
    /// Gets the video to download/convert.
    /// </summary>
    public VideoInfo Video { get; private set; }
    /// <summary>
    /// Starts the work of the <see cref="Downloader"/>.
    /// </summary>
    public abstract void Execute();
    protected void OnDownloadFinished(EventArgs e)
    {
        if (this.DownloadFinished != null)
        {
            this.DownloadFinished(this, e);
        }
    }
    protected void OnDownloadStarted(EventArgs e)
    {
        if (this.DownloadStarted != null)
        {
            this.DownloadStarted(this, e);
        }
    }
    protected void OnProgressChanged(ProgressEventArgs e)
    {
        if (this.ProgressChanged != null)
        {
            this.ProgressChanged(this, e);
        }
    }
}

我的错误在哪里？注意：我想下载异步

Answer 1

来自MSDN文档：

Timeout属性仅影响使用GetResponse方法发出的同步请求。要使异步请求超时，请使用Abort方法。

因此，如果您要执行异步请求，我认为您需要管理自己的计时器，并在任何时间段后对实例调用.Artrt（）。

在这个MSDN页面上有一些.Abort()方法的示例代码显示了这一点。