Question

在我的Android项目中，我使用的是AzureMobileServices，但是当我在发布时启动它时会抛出一个NullReferenceException，它在AMS中有一些深度。

据我所知，这个问题与链接一些Sdk程序集有关，而且我也可以通过禁用链接来解决这个问题。但这会增加应用程序的大小，而且足够大

这是堆栈跟踪

08-14 03:07:13.298 I/MonoDroid(24480): UNHANDLED EXCEPTION: System.ArgumentNullException: Argument cannot be null.
08-14 03:07:13.298 I/MonoDroid(24480): Parameter name: method
08-14 03:07:13.298 I/MonoDroid(24480):   at System.Delegate.CreateDelegate (System.Type type, System.Object firstArgument, System.Reflection.MethodInfo method, Boolean throwOnBindFailure, Boolean allowClosed) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at System.Delegate.CreateDelegate (System.Type type, System.Reflection.MethodInfo method, Boolean throwOnBindFailure) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at System.Delegate.CreateDelegate (System.Type type, System.Reflection.MethodInfo method) [0x00000] in <filename unknown>:0 
An unhandled exception occured.

08-14 03:07:13.298 I/MonoDroid(24480):   at System.Linq.Expressions.Expression.CreateLambda (System.Type delegateType, System.Linq.Expressions.Expression body, System.String name, Boolean tailCall, System.Collections.ObjectModel.ReadOnlyCollection`1 parameters) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at System.Linq.Expressions.Expression.Lambda (System.Linq.Expressions.Expression body, System.String name, Boolean tailCall, IEnumerable`1 parameters) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at System.Linq.Expressions.Expression.Lambda (System.Linq.Expressions.Expression body, Boolean tailCall, IEnumerable`1 parameters) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at System.Linq.Expressions.Expression.Lambda (System.Linq.Expressions.Expression body, System.Linq.Expressions.ParameterExpression[] parameters) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.PartialEvaluator+<>c__DisplayClass4.<EvaluateIndependentSubtrees>b__3 (System.Linq.Expressions.Expression expr, System.Func`2 recur) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.VisitorHelper.Visit (System.Linq.Expressions.Expression expression) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.ExpressionVisitor.VisitBinary (System.Linq.Expressions.BinaryExpression b) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.ExpressionVisitor.Visit (System.Linq.Expressions.Expression exp) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.VisitorHelper.<>n__FabricatedMethod4 (System.Linq.Expressions.Expression ) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.VisitorHelper.<Visit>b__3 (System.Linq.Expressions.Expression e) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.PartialEvaluator+<>c__DisplayClass4.<EvaluateIndependentSubtrees>b__3 (System.Linq.Expressions.Expression expr, System.Func`2 recur) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.VisitorHelper.Visit (System.Linq.Expressions.Expression expression) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.ExpressionVisitor.VisitLambda (System.Linq.Expressions.LambdaExpression lambda) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.ExpressionVisitor.Visit (System.Linq.Expressions.Expression exp) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.VisitorHelper.<>n__FabricatedMethod4 (System.Linq.Expressions.Expression ) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.VisitorHelper.<Visit>b__3 (System.Linq.Expressions.Expression e) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.PartialEvaluator+<>c__DisplayClass4.<EvaluateIndependentSubtrees>b__3 (System.Linq.Expressions.Expression expr, System.Func`2 recur) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.VisitorHelper.Visit (System.Linq.Expressions.Expression expression) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.ExpressionVisitor.VisitUnary (System.Linq.Expressions.UnaryExpression u) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.ExpressionVisitor.Visit (System.Linq.Expressions.Expression exp) [0x00000] in <filename unknown>:0 
08-14 03:07:13.298 I/MonoDroid(24480):   at Microsoft.WindowsAzure.MobileServices.VisitorHelper.<>n__FabricatedMethod4 (System.Linq.Expressions.Expression ) [0x00000] 
08-14 03:07:13.928 E/mono    (24480): 
08-14 03:07:13.928 E/mono    (24480): Unhandled Exception:
08-14 03:07:13.928 E/mono    (24480): System.ArgumentNullException: Argument cannot be null.
08-14 03:07:13.928 E/mono    (24480): Parameter name: method
08-14 03:07:13.928 E/mono    (24480):   at System.Delegate.CreateDelegate (System.Type type, System.Object firstArgument, System.Reflection.MethodInfo method, Boolean throwOnBindFailure, Boolean allowClosed) [0x00000] in <filename unknown>:0 
08-14 03:07:13.928 E/mono    (24480):   at System.Delegate.CreateDelegate (System.Type type, System.Reflection.MethodInfo method, Boolean throwOnBindFailure) [0x00000] in <filename unknown>:0 
08-14 03:07:13.928 E/mono    (24480):   at System.Delegate.CreateDelegate (System.Type type, System.Reflection.MethodInfo method) [0x00000] in <filename unknown>:0 
08-14 03:07:13.928 E/mono    (24480):   at System.Linq.Expressions.Expression.CreateLambda (System.Type delegateType, System.Linq.Expressions.Expression body, System.String name, Boolean tailCall, System.Collections.ObjectModel.ReadOnlyCollection`1 parameters) [0x00000] in <filename unknown>:0 
08-14 03:07:13.928 E/mono    (24480):   at System.Linq.Expressions.Expression.Lambda (System.Linq.Expressions.Expression body, System.String name, Boolean tailCall, IEnumerable`1 parameters) [0x00000] in <filename un
08-14 03:07:13.928 E/mono-rt (24480): [ERROR] FATAL UNHANDLED EXCEPTION: System.ArgumentNullException: Argument cannot be null.
08-14 03:07:13.928 E/mono-rt (24480): Parameter name: method
08-14 03:07:13.928 E/mono-rt (24480):   at System.Delegate.CreateDelegate (System.Type type, System.Object firstArgument, System.Reflection.MethodInfo method, Boolean throwOnBindFailure, Boolean allowClosed) [0x00000] in <filename unknown>:0 
In mgmain JNI_OnLoad
08-14 03:07:13.928 E/mono-rt (24480):   at System.Delegate.CreateDelegate (System.Type type, System.Reflection.MethodInfo method, Boolean throwOnBindFailure) [0x00000] in <filename unknown>:0 
08-14 03:07:13.928 E/mono-rt (24480):   at System.Delegate.CreateDelegate (System.Type type, System.Reflection.MethodInfo method) [0x00000] in <filename unknown>:0 
08-14 03:07:13.928 E/mono-rt (24480):   at System.Linq.Expressions.Expression.CreateLambda (System.Type delegateType, System.Linq.Expressions.Expression body, System.String name, Boolean tailCall, System.Collections.ObjectModel.ReadOnlyCollection`1 parameters) [0x00000] in <filename unknown>:0 
08-14 03:07:13.928 E/mono-rt (24480):   at System.Linq.Expressions.Expression.Lambda (System.Linq.Expressions.Expression body, System.String name, Boolean tailCall, IEnumerable`1 parameters) [0x00000] in

我读了official xamarin topic about linking和MSBuild AndroidLinkSkip。我添加了这个程序集以跳过标记System.Linq;System.Reflection;Microsoft.WindowsAzure.Mobile.Ext，但这根本没有帮助。

这是proj文件的一部分

<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <DebugType>pdbonly</DebugType>
    <Optimize>true</Optimize>
    <OutputPath>bin\Release\</OutputPath>
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
    <AndroidUseSharedRuntime>False</AndroidUseSharedRuntime>
    <AndroidLinkMode>SdkOnly</AndroidLinkMode>
    <AndroidLinkSkip>System.Linq;System.Reflection;Microsoft.WindowsAzure.Mobile.Ext</AndroidLinkSkip>
</PropertyGroup>

我不知道还应该添加什么来解决问题。可能我会尝试添加所有程序集，看看它会有所帮助。同时，任何人都可以给我任何建议我应该添加到链接跳过什么？

Answer 1

我也有同样的问题，我不得不跳过一组装配，直到它正常工作。这些是我在链接时跳过的程序集:(我的项目顺便称为MvvMAppiAppi）

Mono.Android;系统;
System.Core程序;
System.Net.Http;
的System.Xml;
MvvMAppiAppi.Droid;
MvvMAppiAppi.Core;
MvvMAppiAppi.AzureSvc;
Microsoft.WindowsAzure.Mobile;
Microsoft.WindowsAzure.Mobile.Ext;
Newtonsoft.Json;

只有这样才能完成链接工作。我确实会添加程序集，看看你需要跳过多少才能编译...我认为还有另一种方法。

在Android上以发布模式链接和AzureMobileServices的问题

1 个答案: