发送请求时发生错误。 [英] An error occurred while sending the request.

问题描述

当我打电话给  HttpClient服务和应用程序转到后台  （停用）当我去激活它时抛出这个execption

{System.Net.WebException：抛出了类型'System.Net.WebException'的异常。 ---> System.Net.WebException：抛出了类型'System.Net.WebException'的异常。

  在System.Net.Browser.ClientHttpWebRequest.InternalEndGetResponse（IAsyncResult asyncResult）

  在System.Net.Browser.ClientHttpWebRequest。<> c__DisplayClasse。< EndGetResponse> b__d（Object sendState）

  在System.Net.Browser.AsyncHelper。<> c__DisplayClass1。< BeginOnUI> b__0（Object sendState）

   ---内部异常堆栈跟踪结束---

  在System.Net.Browser.AsyncHelper.BeginOnUI（SendOrPostCallback beginMethod，Object state）

  在System.Net.Browser.ClientHttpWebRequest.EndGetResponse（IAsyncResult asyncResult）

  在System.Net.Http.HttpWebRequest.EndGetResponse（IAsyncResult asyncResult）

  在System.Net.Http.HttpClientHandler.GetResponseCallback（IAsyncResult ar）}

---

DesertQueen

解决方案

你好DevWP，



>>当我打电话给  HttpClient服务和应用程序转到后台  （停用）当我去激活它时抛出execption

如果你可以尝试在这里发布你的代码会更好。

然后我创建了以下WCF休息服务：

 [ServiceContract] 
公共接口IMyService1 
 { 
 
 [OperationContract] 
 [WebGet（UriTemplate =" GetMyData"）] 
 string GetData（）; 
} 
 

之后我可以在HttpClient类的帮助下调用上面的WCF Rest服务：

 private async void CallHttpClientService（）
 {
 HttpClient httpClient = new HttpClient（）; 
 HttpRequestMessage request = new HttpRequestMessage（HttpMethod.Get，" http：//*******/MyService1.svc/GetMyData"）; 
 HttpResponseMessage response = await httpClient.SendAsync（request）; 
 string result = await response.Content.ReadAsStringAsync（）; 
 var MessageDialog = new MessageDialog（result）; 
等待MessageDialog.ShowAsync（）; 
} 

它运作正常。

最好的问候，

Amy Peng

When i call  HttpClient service and application go to background  (deactivated) when i go to activate it throw this execption

{System.Net.WebException: Exception of type 'System.Net.WebException' was thrown. ---> System.Net.WebException: Exception of type 'System.Net.WebException' was thrown.
   at System.Net.Browser.ClientHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
   at System.Net.Browser.ClientHttpWebRequest.<>c__DisplayClasse.<EndGetResponse>b__d(Object sendState)
   at System.Net.Browser.AsyncHelper.<>c__DisplayClass1.<BeginOnUI>b__0(Object sendState)
   --- End of inner exception stack trace ---
   at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
   at System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)}

---

DesertQueen

解决方案

Hi DevWP,

>>When i call  HttpClient service and application go to background  (deactivated) when i go to activate it throw execption

It will be better if you can try to post your code here.

Then I have created the following WCF Rest Service:

[ServiceContract]
public interface IMyService1
{

  [OperationContract]
  [WebGet(UriTemplate = "GetMyData")]
  string GetData();    
}

After that I can call the above WCF Rest Service with the help of the HttpClient class:

private async void CallHttpClientService()
{
    HttpClient httpClient = new HttpClient();
    HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, "http://*******/MyService1.svc/GetMyData");
    HttpResponseMessage response = await httpClient.SendAsync(request);
    string result = await response.Content.ReadAsStringAsync();
    var MessageDialog = new MessageDialog(result );
    await MessageDialog.ShowAsync();
 }

It just works fine.

Best Regards,
Amy Peng

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