System.Net.Http中xamarin.forms中的异常

我有这个例外，我在我的日志中打印导致应用程序崩溃在android，motorola设备xt1058 .

问题是我没有设备，我从发送给我日志文件的客户端获取日志 .

我不知道日志来自哪里 .

我把所有应用程序包裹在try catch中，但应用程序仍然崩溃了

09:37:10 - TaskSchedulerOnUnobservedTaskException中的错误：通过等待任务或访问其Exception属性未观察到任务的异常 . 结果，终结器线程重新抛出了未观察到的异常 .

09:37:11 - TaskSchedulerOnUnobservedTaskException出错：System.AggregateException：通过等待任务或访问其Exception属性未观察到任务的异常 . 结果，终结器线程重新抛出了未观察到的异常 . ---> System.Net.WebException：错误：System.Net.HttpWebRequest.EndGetResponse（System.IAsyncResult asyncResult）中的NameResolutionFailure [0x00064]在<552eeeb8705c4abb9eeb5ebce43b6865>：0中的System.Threading.Tasks.TaskFactory 1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func 2 [T，TResult ] endFunction，System.Action 1[T] endAction, System.Threading.Tasks.Task 1 [TResult] promise，System.Boolean requiresSynchronization）[0x00014] in <52ca43e23d764403a7855ae066156266>：0 ---从抛出异常的上一个位置开始的堆栈跟踪---在System.Runtime.ExceptionServices .ExceptionDispatchInfo.Throw（）[0x0000c]在<52ca43e23d764403a7855ae066156266>：0中System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x0004e]在<52ca43e23d764403a7855ae066156266>：0在System.Runtime.CompilerServices System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x0000b]在<52ca43e23d764403a7855ae066156266>：0处于System.Runtime.CompilerServices.ConfiguredTaskAwaitable 1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in <52ca43e23d764403a7855ae066156266>:0 at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x0041e] in <21d260c0947046f0aae7990757a51ba3>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <52ca43e23d764403a7855ae066156266>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in <52ca43e23d764403a7855ae066156266>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in <52ca43e23d764403a7855ae066156266>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in <52ca43e23d764403a7855ae066156266>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable 1 ConfiguredTaskAwaiter [TResult] .GetResult（）[0x00000] in <52ca43e23d764403a7855ae066156266>：0 at System.Net.Http.HttpClient c__async0.MoveNext（ ）[0x000f3] in <21d260c0947046f0aae7990757a51ba3>：0 ---内部异常堆栈跟踪结束--- --->（内部异常＃0）System.Net.WebException：错误：System.Net.HttpWebRequest.EndGetResponse上的NameResolutionFailure（ System.IAsyncResult asyncResult）[0x00064]在<552eeeb8705c4abb9eeb5ebce43b6865>：0处于System.Threading.Tasks.TaskFactory 1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func 2 [T，TResult] endFunction，System.Action 1[T] endAction, System.Threading.Tasks.Task 1 [TResult] promise，System.Boolean requiresSynchronization）[0x00014] in <52ca43e23d764403a7855ae066156266>：0 ---从抛出异常的上一个位置开始的堆栈跟踪结束---在System.Runtime.Compil的<52ca43e23d764403a7855ae066156266>中的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）[0x0000c]处： erServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x0004e] in <52ca43e23d764403a7855ae066156266>：0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task task）[0x0002e] in <52ca43e23d764403a7855ae066156266 >：System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x0000b]中的0：<52ca43e23d764403a7855ae066156266>：0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable 1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in <52ca43e23d764403a7855ae066156266>:0 at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x0041e] in <21d260c0947046f0aae7990757a51ba3>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <52ca43e23d764403a7855ae066156266>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in <52ca43e23d764403a7855ae066156266>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in <52ca43e23d764403a7855ae066156266>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in <52ca43e23d764403a7855ae066156266>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable 1 ConfiguredTaskAwaiter [TResult] .GetResult（） [0x00000]在<52ca43e23d764403a7855ae066156266>：System.SNet.Http.HttpClient中的0：c_async0.MoveNext（）[0x000f3]在<21d260c0947046f0aae7990757a51ba3>中：0 <---