[英]c# abort async HttpWebRequest after timeout
我在這里https://stackoverflow.com/a/19215782/4332018找到了一個將CancellationToken
與async HttpWebRequest
一起使用的不錯的解決方案:
public static class Extensions
{
public static async Task<HttpWebResponse> GetResponseAsync(this HttpWebRequest request, CancellationToken ct)
{
using (ct.Register(() => request.Abort(), useSynchronizationContext: false))
{
try
{
var response = await request.GetResponseAsync();
return (HttpWebResponse)response;
}
catch (WebException ex)
{
// WebException is thrown when request.Abort() is called,
// but there may be many other reasons,
// propagate the WebException to the caller correctly
if (ct.IsCancellationRequested)
{
// the WebException will be available as Exception.InnerException
throw new OperationCanceledException(ex.Message, ex, ct);
}
// cancellation hasn't been requested, rethrow the original WebException
throw;
}
}
}
}
但是我不明白,如果執行的時間超過預設時間,該如何中止request
。
我知道CancellationTokenSource()
和CancelAfter(Int32)
,但是不了解如何修改以上示例以使用CancellationTokenSource
,因為它沒有Register
方法。
在預設時間后如何取消async HttpWebRequest
?
創建令牌源時,請設置取消。 然后傳遞令牌。 它應該超時。
CancellationTokenSource cts = new CancellationTokenSource();
cts.CancelAfter(1000);
var ct = cts.Token;
var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://www.zzz.com/here");
var test = Extensions.GetResponseAsync(httpWebRequest, ct);
希望對您有幫助
_cancelTasks = new CancellationTokenSource();
string Response = null;
var task = new Task(() => {
try
{
using (var wb = new WebClient())
{
var data = new NameValueCollection();
data["XMLString"] = XMLRequest;
var response = wb.UploadValues(ServiceURL, "POST", data);
}
}
catch (Exception ex)
{
}
}, _cancelTasks.Token);
task.Start();
if (!task.Wait(GWRequestTimeout * 1000))
{
_cancelTasks.Cancel();
}
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