Question

我有一个程序，里面有很多HttpWebRequest个调用。它为各种流媒体平台（Twitch，Hitbox，Beam，YouTube）提供了大量外部API请求。我的所有要求似乎都很好。

以下是我的一个要求的示例：

private void save_Click(object sender, RoutedEventArgs e)
{
    string postUrl = "https://api.twitch.tv/kraken/channels/" + this.channelID;
    string postData = "channel[status]=" + Uri.EscapeDataString(status.Text) +
        "&channel[game]=" + Uri.EscapeDataString(game.Text);
    byte[] postByte = Encoding.UTF8.GetBytes(postData);

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(postUrl);

    request.Method = "PUT";
    request.Accept = "application/vnd.twitchtv.v5+json";
    request.ContentType = "application/x-www-form-urlencoded";
    request.ContentLength = postByte.Length;
    request.Headers.Add("Authorization", "OAuth " + password.Password);
    request.Headers.Add("Client-ID", this.clientID);
    request.Timeout = 15000;

    try
    {
        Stream putStream = request.GetRequestStream();
        putStream.Write(postByte, 0, postByte.Length);
        putStream.Close();

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    }
    catch (WebException err)
    {
        MessageBox.Show("Unable to update channel information:\n" + err.Message);
    }
}

但是，如果请求失败（例如短暂的互联网打嗝），并且try-catch因超时而响应错误，则会出现问题，因此在重新启动程序之前，将来不会有HttpWebRequests工作。< / p>

只有在超时启动错误捕获时才会发生这种情况。

是否有这种情况发生的原因以及如何解决？

Answer 1

这很可能是由未正确释放导致锁定的资源引起的。

将您的代码更改为可能在WebException上调用HttpWebRequest上的中止，也可能将HttpWebResponse和putStream包装在using语句中。

    private void save_Click(object sender, RoutedEventArgs e)
    {
        string postUrl = "https://api.twitch.tv/kraken/channels/" + this.channelID;
        string postData = "channel[status]=" + Uri.EscapeDataString(status.Text) +
            "&channel[game]=" + Uri.EscapeDataString(game.Text);
        byte[] postByte = Encoding.UTF8.GetBytes(postData);

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(postUrl);

        request.Method = "PUT";
        request.Accept = "application/vnd.twitchtv.v5+json";
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = postByte.Length;
        request.Headers.Add("Authorization", "OAuth " + password.Password);
        request.Headers.Add("Client-ID", this.clientID);
        request.Timeout = 15000;

        try
        {
            using (Stream putStream = request.GetRequestStream())
            {
                putStream.Write(postByte, 0, postByte.Length);
                using (var response = (HttpWebResponse) request.GetResponse())
                {
                    //assign the response result to a variable else it's getting disposed
                }
            }
        }
        catch (WebException err)
        {
            request.Abort();
            MessageBox.Show("Unable to update channel information:\n" + err.Message);
        }
    }

.NET HttpWebRequest超时杀死所有未来请求？

1 个答案: