Xamarin C#:System.Reflection.TargetInvocationException [英] Xamarin C#: System.Reflection.TargetInvocationException

问题描述

我需要在 Xamarin.Forms APP 中使用 WebService(SOAP).我在 PCL 中将 webService 作为服务参考"导入.

I need consume a WebService(SOAP) in a Xamarin.Forms APP. I import the webService as "Service Reference" in PCL.

然后我将 webService 称为:

Then i call the webService as:

  //...oncreate
    Guid g1 = new Guid("3f0c9ec7-9382-403d-8480-7142a7fd65d9");
    ws.GetNotificacionesAsync(g1);
    ws.GetNotificacionesCompleted += ws_GetNotificacionesCompleted;

void ws_GetNotificacionesCompleted(object sender, WSPuentesUsuario.GetNotificacionesCompletedEventArgs e)
            {
                int a = 12;
            }

最后，e"显示这个错误:Result = System.Reflection.TargetInvocationException: Exception has been throwed by the target of an invocation.

Finally, "e" show this error: Result = System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.

(int a = 12; 仅用于断点)PD:我用这个链接怎么举例http://developer.xamarin.com/guides/cross-platform/application_fundamentals/web_services/

(int a = 12; is only used to breakpoint) PD: I use this link how example http://developer.xamarin.com/guides/cross-platform/application_fundamentals/web_services/

推荐答案

我发现了问题.Xamarin Android 需要通信 HttpGet 和 HttpPost 协议.这些协议必须在 SideServer 上生成.以这种形式添加协议:

I found the problem. Xamarin Android need to comunicate the HttpGet and HttpPost protocols. These protocols must be generated on SideServer. Adds protocols this form:

https://msdn.microsoft.com/en-us/library/4yx7be39(v=vs.100).aspx

最后:System.reflexion.Exception 可能是由服务器的空响应引起的.(不正确的协议)

Finally: System.reflexion.Exception can be caused by a null response from server.(Incorrect protocols)

PD:记住使用模拟器/设备上的浏览器来查看正确的 webService 导航(链接 webService)，还要记住 localhost 是一个无效的设备/模拟器链接.

PD: Remember use the browser on emulator/device to see the correct navegation to webService(link webService), also remember that localhost is a invalid link to device/emulator.

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