Xamarin Forms App在iOS上以发布模式崩溃，但在调试模式下工作
我有支持iOS和Android的Xamarin Forms应用程序。 它在发布模式下在Android上正常运行。 在iOS上，它在发布模式下不起作用，但在调试模式下工作。 单击一个调用少量function的按钮时会崩溃。 我在下面附上了错误日志。 奇怪的是，它在发布模式下适用于模拟器。
错误日志：
Incident Identifier: 391C564C-028D-4084-BC4A-21ED49BB1F25 CrashReporter Key: 30B4418D-AA04-4575-97A3-97A9F491C62D Hardware Model: iPhone7,2 Process: TestApp.iOS [600] Path: /var/containers/Bundle/Application/7F4E5392-9BEA-4578-9E23-02112B61EB96/TestApp.iOS.app/TestApp.iOS Identifier: uk.co.company.testapp Version: 0.0.1 (1.0) Code Type: ARM-64 Parent Process: ??? [1] Date/Time: 2018-01-22T13:02:31Z Launch Time: 2018-01-22T13:02:23Z OS Version: iPhone OS 9.3.2 (13F69) Report Version: 104-Xamarin Exception Type: SIGABRT Exception Codes: #0 at 0x180da811c Crashed Thread: 0 Application Specific Information: *** Terminating app due to uncaught exception 'System.ArgumentNullException', reason: 'System.ArgumentNullException: Value cannot be null.' Xamarin Exception Stack: Parameter name: method at System.Linq.Expressions.Expression.Call (System.Linq.Expressions.Expression instance, System.Reflection.MethodInfo method, System.Collections.Generic.IEnumerable`1[T] arguments) [0x00111] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/external/corefx/src/System.Linq.Expressions/src/System/Linq/Expressions/MethodCallExpression.cs:1239 at System.Linq.Expressions.Expression.Call (System.Linq.Expressions.Expression instance, System.Reflection.MethodInfo method, System.Linq.Expressions.Expression[] arguments) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/external/corefx/src/System.Linq.Expressions/src/System/Linq/Expressions/MethodCallExpression.cs:1046 at System.Linq.Expressions.Expression.Call (System.Reflection.MethodInfo method, System.Linq.Expressions.Expression[] arguments) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/external/corefx/src/System.Linq.Expressions/src/System/Linq/Expressions/MethodCallExpression.cs:1001 at System.Dynamic.ExpandoObject+MetaExpando.BindSetMember (System.Dynamic.SetMemberBinder binder, System.Dynamic.DynamicMetaObject value) [0x00033] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/external/corefx/src/System.Linq.Expressions/src/System/Dynamic/ExpandoObject.cs:863 at System.Dynamic.SetMemberBinder.Bind (System.Dynamic.DynamicMetaObject target, System.Dynamic.DynamicMetaObject[] args) [0x00035] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/external/corefx/src/System.Linq.Expressions/src/System/Dynamic/SetMemberBinder.cs:57 at System.Dynamic.DynamicMetaObjectBinder.Bind (System.Object[] args, System.Collections.ObjectModel.ReadOnlyCollection`1[T] parameters, System.Linq.Expressions.LabelTarget returnLabel) [0x000c6] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/external/corefx/src/System.Linq.Expressions/src/System/Dynamic/DynamicMetaObjectBinder.cs:90 at System.Runtime.CompilerServices.CallSiteBinder.BindCore[T] (System.Runtime.CompilerServices.CallSite`1[T] site, System.Object[] args) [0x00019] in :0 at System.Runtime.CompilerServices.CallSiteOps.Bind[T] (System.Runtime.CompilerServices.CallSiteBinder binder, System.Runtime.CompilerServices.CallSite`1[T] site, System.Object[] args) [0x00000] in :0 at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:305 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Exception source) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:156 at System.Linq.Expressions.Interpreter.ExceptionHelpers.UnwrapAndRethrow (System.Reflection.TargetInvocationException exception) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/external/corefx/src/System.Linq.Expressions/src/System/Linq/Expressions/Interpreter/Utilities.cs:172 at System.Linq.Expressions.Interpreter.MethodInfoCallInstruction.Run (System.Linq.Expressions.Interpreter.InterpretedFrame frame) [0x00035] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/external/corefx/src/System.Linq.Expressions/src/System/Linq/Expressions/Interpreter/CallInstruction.cs:327 at System.Linq.Expressions.Interpreter.Interpreter.Run (System.Linq.Expressions.Interpreter.InterpretedFrame frame) [0x00015] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/external/corefx/src/System.Linq.Expressions/src/System/Linq/Expressions/Interpreter/Interpreter.cs:63 at System.Linq.Expressions.Interpreter.LightLambda.Run3[T0,T1,T2,TRet] (T0 arg0, T1 arg1, T2 arg2) [0x00038] in :0 at TestApp.LoginPage+d__1.MoveNext () [0x00205] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.AsyncMethodBuilderCore+c.b__6_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.3/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1018 at UIKit.UIKitSynchronizationContext+c__AnonStorey0.m__0 () [0x00000] in /Users/builder/data/lanes/5665/f70a1348/source/xamarin-macios/src/UIKit/UIKitSynchronizationContext.cs:24 at Foundation.NSAsyncActionDispatcher.Apply () [0x00000] in /Users/builder/data/lanes/5665/f70a1348/source/xamarin-macios/src/Foundation/NSAction.cs:163 at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr) at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/data/lanes/5665/f70a1348/source/xamarin-macios/src/UIKit/UIApplication.cs:79 at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/5665/f70a1348/source/xamarin-macios/src/UIKit/UIApplication.cs:63 at TestApp.iOS.Application.Main (System.String[] args) [0x00000] in :0 编辑：我有一个有趣的发现。 我只需按一下按钮即可调用onLoginClicked函数，然后调用PostData函数，该函数使REST调用将数据发送到服务器。 每当调用PostData函数时，应用程序崩溃。
如果我将所有代码从PostData函数移动到onLoginClicked函数，它就可以了！
请在下面找到更多信息：
- 我尝试清理和重建解决方案但是，它没有用。
- 在PostData方法的每一行上放置断点毫无意义，因为应用程序仅在发布模式下崩溃，但在调试模式下工作。
-
应用程序在调用PostData函数的行中的onLoginClicked方法崩溃，即
string responseData = await PostData（user，“auth / login”）;
-
当我尝试在PostData函数中添加一些警报时，看看它到达了什么点，但发现它甚至没有达到该方法的第一行。 这很奇怪。
码：
async void onLoginClicked(object sender, System.EventArgs e) { string error = ""; if (txtEmail.Text == null || txtEmail.Text == "") { error += Constants.ERR_BLANK_EMAIL + "\r\n"; } else if (txtEmail.Text.Length 0) { Constants.outlets = new List(); foreach(var store in outletResp){ Outlet shop = new Outlet(); shop.access_token = store["access_token"]; shop.email = store["email"]; shop.user_id = store["id"]; shop.master_id = store["master_id"]; shop.outlet_id = store["outlet_id"]; shop.post_code = store["post_code"]; shop.profile_pic = store["profile_pic"]; shop.retailer_id = store["retailer_id"]; shop.retailer_image = store["retailer_image"]; shop.store_name = store["store_name"]; shop.tutorial_pricing_tool = int.Parse(""+store["tutorial_pricing_tool"]); Constants.outlets.Add(shop); } } var isPinSet = Helpers.Settings.PinSet; await Navigation.RemovePopupPageAsync(loadingPage); if (responseObj.data.pin==0 || !isPinSet){ App.Current.MainPage = new NavigationPage(new SetPinPage(false)); } else{ App.Current.MainPage = new NavigationPage(new StoreListPage()); } } else { await Navigation.RemovePopupPageAsync(loadingPage); if (responseObj["error_code"].Value == 1) lblError.Text = responseObj["error"]; else lblError.Text = responseObj["message"]; errorContainer.IsVisible = true; } } else { await DisplayAlert(Constants.APP_TITLE, "Please check your internet connection.", "OK"); } } async public Task PostData(System.Dynamic.ExpandoObject args, string actionUrl) { string responseData = ""; HttpClient client = new HttpClient(); client.MaxResponseContentBufferSize = 256000; var param = Constants.JWT ? GetJWTToken(args, actionUrl) : JsonConvert.SerializeObject(args); var content = new StringContent(param, Encoding.UTF8, "application/json"); client.DefaultRequestHeaders.Add("Authorization", param); client.DefaultRequestHeaders.Add("X-Device-Type", "android"); client.DefaultRequestHeaders.Add("X-APP-Type", "b2b"); client.DefaultRequestHeaders.Add("X-APP-Platform", "xamarin"); HttpResponseMessage response = null; response = await client.PostAsync(Constants.BaseUrl + actionUrl, content); if (response.IsSuccessStatusCode) { response.EnsureSuccessStatusCode(); } responseData = await response.Content.ReadAsStringAsync(); if (Constants.JWT) { var resp = JObject.Parse(responseData); var respToken = resp["token"]; var rtokenStr = respToken.ToObject(); var respPayloadStr = rtokenStr.Split('.'); byte[] data = JWTLibrary.Converter.Base64UrlDecode(respPayloadStr[1]); responseData = JWTLibrary.Converter.GetStringFromBytes(data); } return responseData; } private string GetJWTToken(System.Dynamic.ExpandoObject args, string actionUrl) { var dt = DateTime.Now; var ticks = dt.Ticks; var currentSec = ticks / TimeSpan.TicksPerSecond; var newEndTime = currentSec + 60; Object payload = new Dictionary() { { "iat", currentSec }, { "nbf", currentSec }, { "exp", newEndTime }, { "iss", actionUrl }, { "jti", "" }, { "bat_data", args } }; var secret_key = "key"; dynamic n_header = new System.Dynamic.ExpandoObject(); n_header.typ = "jwt"; n_header.alg = "HS256"; byte[] headerBytes = JWTLibrary.Converter.GetBytesFromString(JsonConvert.SerializeObject(n_header)); byte[] payloadBytes = JWTLibrary.Converter.GetBytesFromString(JsonConvert.SerializeObject(payload)); var enc_header = JWTLibrary.Converter.Base64UrlEncode(headerBytes); var enc_payload = JWTLibrary.Converter.Base64UrlEncode(payloadBytes); string jwt_token = enc_header + "." + enc_payload; var sh_h256 = JWTLibrary.Converter.CreateToken(jwt_token, secret_key); var jwt_enc_signature = JWTLibrary.Converter.Base64UrlEncode(sh_h256); jwt_token = jwt_token + "." + jwt_enc_signature; return jwt_token; }
我担心问题是由dynamic关键字引起的。
DynamicMethod类是驻留在System.Reflection.Emit的运行时代码生成function集的一部分。 但是，System.Reflection.EmitAPI在iOS中不可用。
细节参考为什么我不能在Xamarin.iOS中使用“动态”C＃关键字？