在UIPickerView中选择项目后调用服务时，我在下面的stacktrace中提到了错误。
2018-10-12 15:57:38.378 UPGNet[14618:288093] critical: at <unknown> <0xffffffff>
2018-10-12 15:57:38.378 UPGNet[14618:288093] critical: at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) [0x0005c] in <4ab8db046af64ab0ae036378dae8bfd3>:0
2018-10-12 15:57:38.379 UPGNet[14618:288093] critical: at UIKit.UIApplication.Main (string[],intptr,intptr) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.14.0.14/src/Xamarin.iOS/UIKit/UIApplication.cs:79
2018-10-12 15:57:38.379 UPGNet[14618:288093] critical: at UIKit.UIApplication.Main (string[],string,string) [0x0002c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.14.0.14/src/Xamarin.iOS/UIKit/UIApplication.cs:63
2018-10-12 15:57:38.379 UPGNet[14618:288093] critical: at UPGNet.Application.Main (string[]) [0x00001] in /Users/akanksha/Desktop/JCI/JCI/JCI_Latest/UPGNet/UPGNet/Main.cs:12
2018-10-12 15:57:38.379 UPGNet[14618:288093] critical: at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) [0x00051] in <e6e9870a2e87421aabfd33c5b0feb2a2>:0
2018-10-12 15:57:38.379 UPGNet[14618:288093] critical:
Native stacktrace:
2018-10-12 15:57:38.386 UPGNet[14618:288093] critical: 0 UPGNet 0x000000010e156e94 mono_handle_native_crash + 244
2018-10-12 15:57:38.387 UPGNet[14618:288093] critical: 1 libsystem_platform.dylib 0x0000000117386f5a _sigtramp + 26
2018-10-12 15:57:38.387 UPGNet[14618:288093] critical: 2 libsystem_kernel.dylib 0x0000000117345480 libsystem_kernel.dylib + 1152
2018-10-12 15:57:38.387 UPGNet[14618:288093] critical: 3 libsystem_c.dylib 0x0000000116fbcc97 abort + 127
2018-10-12 15:57:38.387 UPGNet[14618:288093] critical: 4 UPGNet 0x000000010e34b660 _ZL12log_callbackPKcS0_S0_iPv + 64
2018-10-12 15:57:38.387 UPGNet[14618:288093] critical: 5 UPGNet 0x000000010e33fb13 monoeg_g_logv + 83
2018-10-12 15:57:38.387 UPGNet[14618:288093] critical: 6 UPGNet 0x000000010e33fe07 monoeg_assertion_message + 199
2018-10-12 15:57:38.388 UPGNet[14618:288093] critical: 7 UPGNet 0x000000010e0b4c44 get_this_async_id + 420
2018-10-12 15:57:38.388 UPGNet[14618:288093] critical: 8 UPGNet 0x000000010e0b3dcf ss_start + 751
2018-10-12 15:57:38.388 UPGNet[14618:288093] critical: 9 UPGNet 0x000000010e0a7663 process_breakpoint + 947
2018-10-12 15:57:38.388 UPGNet[14618:288093] critical: 10 UPGNet 0x000000010e0a723e debugger_agent_breakpoint_from_context + 158
2018-10-12 15:57:38.389 UPGNet[14618:288093] critical: 11 ??? 0x0000000134ae907f 0x0 + 5178822783
2018-10-12 15:57:38.389 UPGNet[14618:288093] critical: 12 ??? 0x000000013944c222 0x0 + 5255774754
2018-10-12 15:57:38.389 UPGNet[14618:288093] critical: 13 ??? 0x0000000137a8fe3f 0x0 + 5228789311
2018-10-12 15:57:38.389 UPGNet[14618:288093] critical: 14 ??? 0x000000013944a433 0x0 + 5255767091
2018-10-12 15:57:38.389 UPGNet[14618:288093] critical: 15 UPGNet 0x000000010e169be3 mono_jit_runtime_invoke + 1443
2018-10-12 15:57:38.389 UPGNet[14618:288093] critical: 16 UPGNet 0x000000010e25990f mono_runtime_invoke_checked + 127
2018-10-12 15:57:38.389 UPGNet[14618:288093] critical: 17 UPGNet 0x000000010e25d383 mono_runtime_invoke + 83
2018-10-12 15:57:38.390 UPGNet[14618:288093] critical: 18 UPGNet 0x000000010e3544e2 xamarin_invoke_trampoline + 6018
2018-10-12 15:57:38.390 UPGNet[14618:288093] critical: 19 UPGNet 0x000000010e35c38d xamarin_arch_trampoline + 189
2018-10-12 15:57:38.390 UPGNet[14618:288093] critical: 20 UPGNet 0x000000010e35d7c1 xamarin_x86_64_common_trampoline + 110
2018-10-12 15:57:38.390 UPGNet[14618:288093] critical: 21 UIKit 0x0000000111220448 -[UIApplication sendAction:to:from:forEvent:] + 83
2018-10-12 15:57:38.391 UPGNet[14618:288093] critical: 22 UIKit 0x0000000111c250d9 __45-[_UIButtonBarTargetAction _invoke:forEvent:]_block_invoke + 154
2018-10-12 15:57:38.391 UPGNet[14618:288093] critical: 23 UIKit 0x0000000111c25012 -[_UIButtonBarTargetAction _invoke:forEvent:] + 154
2018-10-12 15:57:38.391 UPGNet[14618:288093] critical: 24 UIKit 0x0000000111220448 -[UIApplication sendAction:to:from:forEvent:] + 83
2018-10-12 15:57:38.392 UPGNet[14618:288093] critical: 25 UIKit 0x000000011139b804 -[UIControl sendAction:to:forEvent:] + 67
2018-10-12 15:57:38.393 UPGNet[14618:288093] critical: 26 UIKit 0x000000011139bb21 -[UIControl _sendActionsForEvents:withEvent:] + 450
2018-10-12 15:57:38.393 UPGNet[14618:288093] critical: 27 UIKit 0x000000011139aa69 -[UIControl touchesEnded:withEvent:] + 580
2018-10-12 15:57:38.393 UPGNet[14618:288093] critical: 28 UIKit 0x000000011129511f -[UIWindow _sendTouchesForEvent:] + 2729
2018-10-12 15:57:38.394 UPGNet[14618:288093] critical: 29 UIKit 0x0000000111296821 -[UIWindow sendEvent:] + 4086
2018-10-12 15:57:38.394 UPGNet[14618:288093] critical: 30 UIKit 0x000000011123a370 -[UIApplication sendEvent:] + 352
2018-10-12 15:57:38.394 UPGNet[14618:288093] critical: 31 UIKit 0x0000000111b7b57f __dispatchPreprocessedEventFromEventQueue + 2796
2018-10-12 15:57:38.395 UPGNet[14618:288093] critical: 32 UIKit 0x0000000111b7e194 __handleEventQueueInternal + 5949
2018-10-12 15:57:38.395 UPGNet[14618:288093] critical: 33 CoreFoundation 0x0000000114d1bbb1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
2018-10-12 15:57:38.395 UPGNet[14618:288093] critical: 34 CoreFoundation 0x0000000114d004af __CFRunLoopDoSources0 + 271
2018-10-12 15:57:38.395 UPGNet[14618:288093] critical: 35 CoreFoundation 0x0000000114cffa6f __CFRunLoopRun + 1263
2018-10-12 15:57:38.395 UPGNet[14618:288093] critical: 36 CoreFoundation 0x0000000114cff30b CFRunLoopRunSpecific + 635
2018-10-12 15:57:38.396 UPGNet[14618:288093] critical: 37 GraphicsServices 0x000000011a874a73 GSEventRunModal + 62
2018-10-12 15:57:38.396 UPGNet[14618:288093] critical: 38 UIKit 0x000000011121f0b7 UIApplicationMain + 159
2018-10-12 15:57:38.396 UPGNet[14618:288093] critical: 39 ??? 0x0000000136abc2fe 0x0 + 5212193534
2018-10-12 15:57:38.396 UPGNet[14618:288093] critical: 40 ??? 0x0000000136abc093 0x0 + 5212192915
2018-10-12 15:57:38.396 UPGNet[14618:288093] critical:
在执行本机代码时获得了SIGABRT。这通常表明 Mono运行时或本机库之一中的致命错误 由您的应用程序使用。