在等待PostAsJsonAsync AggregateException抛出 [英] AggregateException is throwing while waiting for PostAsJsonAsync

问题描述

AggregateException是扔在等待API后，完成我怎么能解决这个问题？

我的API调用是这样的类似

 使用（VAR的HttpClient =新的HttpClient（））
{
    httpClient.BaseAddress =新的URI（workflowUrl）;
    VAR任务= httpClient.PostAsJsonAsync（API / apiname /执行/，executeModel）
                             .ContinueWith（X =＆GT; x.Result.Content.ReadAsAsync＆LT;布尔＆GT;（）的结果。）;    任务延续= task.ContinueWith（X =＆GT;
    {
        布尔响应= x.Result;
    }）;
    continuation.Wait（）;}
 

我得到异常如下而waitng完成POST。

  System.AggregateException被抓
  消息=发生一个或多个错误。
  来源= mscorlib程序
  堆栈跟踪：
       在System.Threading.Tasks.Task.ThrowIfExceptional（布尔includeTaskCanceledExceptions）
       在System.Threading.Tasks.Task.Wait（的Int32 millisecondsTimeout，的CancellationToken的CancellationToken）
       在System.Threading.Tasks.Task.Wait（）
       在
  的InnerException：System.AggregateException
       消息=发生一个或多个错误。
       来源= mscorlib程序
       堆栈跟踪：
            在System.Threading.Tasks.Task.ThrowIfExceptional（布尔includeTaskCanceledExceptions）
            在System.Threading.Tasks.Task`1.get_Result（）
            在
            在System.Threading.Tasks.Task`1＆LT;方式＆gt;＆c__DisplayClass17 LT; ContinueWith＆GT; b__16（obj对象）
            在System.Threading.Tasks.Task.InnerInvoke（）
            在System.Threading.Tasks.Task.Execute（）
       的InnerException：System.AggregateException
            消息=发生一个或多个错误。
            来源= mscorlib程序
            堆栈跟踪：
                 在System.Threading.Tasks.Task.ThrowIfExceptional（布尔includeTaskCanceledExceptions）
                 在System.Threading.Tasks.Task`1.get_Result（）
                 在WebUI.ListController＆LT; ListRepeater_ItemCommand＆GT; b__f（Task`1 X）在PostAsJsonAsync：741线
                 在System.Threading.Tasks.Task`1＆LT;方式＆gt;＆c__DisplayClass1a`1 LT; ContinueWith＆GT; b__19（）
                 在System.Threading.Tasks.Task`1.InvokeFuture（对象futureAsObj）
                 在System.Threading.Tasks.Task.InnerInvoke（）
                 在System.Threading.Tasks.Task.Execute（）
            的InnerException：System.Threading.Tasks.TaskCanceledException
                 消息=任务被取消。
                 的InnerException：
 

解决方案

您发布一大块的数据？我曾有过一个类似的问题。我认为，根本的问题是偶尔超时由于带宽的问题。我试图让任务和手动等待它，然后检查 .IsFaulted 和 .IsCancelled 但。结果抛出 AggregateException / TaskCancelledException 。

也许你应该尝试增加<一个href=\"http://msdn.microsoft.com/en-us/library/system.net.http.httpclient.timeout%28v=vs.110%29.aspx\">HttpClient.Timeout财产是100秒默认？

AggregateException is throwing while waiting for API post to complete how i could fix this?

My API call is similar like this

using (var httpClient = new HttpClient())
{
    httpClient.BaseAddress = new Uri(workflowUrl);
    var task = httpClient.PostAsJsonAsync("api/apiname/execute/", executeModel)
                             .ContinueWith(x => x.Result.Content.ReadAsAsync<bool>().Result);

    Task continuation = task.ContinueWith(x =>
    {
        bool response = x.Result;
    });
    continuation.Wait(); 

}

I am getting Exception given below while waitng for POST to complete.

  System.AggregateException was caught
  Message=One or more errors occurred.
  Source=mscorlib
  StackTrace:
       at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
       at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
       at System.Threading.Tasks.Task.Wait()
       at 
  InnerException: System.AggregateException
       Message=One or more errors occurred.
       Source=mscorlib
       StackTrace:
            at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
            at System.Threading.Tasks.Task`1.get_Result()
            at 
            at System.Threading.Tasks.Task`1.<>c__DisplayClass17.<ContinueWith>b__16(Object obj)
            at System.Threading.Tasks.Task.InnerInvoke()
            at System.Threading.Tasks.Task.Execute()
       InnerException: System.AggregateException
            Message=One or more errors occurred.
            Source=mscorlib
            StackTrace:
                 at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
                 at System.Threading.Tasks.Task`1.get_Result()
                 at WebUI.ListController.<ListRepeater_ItemCommand>b__f(Task`1 x) in PostAsJsonAsync:line 741
                 at System.Threading.Tasks.Task`1.<>c__DisplayClass1a`1.<ContinueWith>b__19()
                 at System.Threading.Tasks.Task`1.InvokeFuture(Object futureAsObj)
                 at System.Threading.Tasks.Task.InnerInvoke()
                 at System.Threading.Tasks.Task.Execute()
            InnerException: System.Threading.Tasks.TaskCanceledException
                 Message=A task was canceled.
                 InnerException:

解决方案

Are you posting a big piece of data ? Once I had a similar issue. I believe the underlying problem is occasional timeout due to bandwidth issues. I tried getting the task and manually waiting on it then checking .IsFaulted and .IsCancelled but the .Result throws AggregateException / TaskCancelledException.

Maybe you should try to increase HttpClient.Timeout property which is 100 sec by default ?

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