在 Visual Studio 2013 和 2015 中运行一段代码时,我得到了两种不同的结果。在 visual Studio 2015 上,我得到一个 NullReference,在 2013 年,它按应有的方式工作。此外,Visual Studio 2015 在 Windows 8.1 上的 Windows 10 和 2013 上运行。这段代码是:
private static T FindParentOfType<T>(DependencyObject o)
{
dynamic parent = VisualTreeHelper.GetParent(o);
return parent.GetType().IsAssignableFrom(typeof(T)) ? parent : FindParentOfType<T>(parent);
}
代码调用方式:
Grid RiskGrid = FindParentOfType<Grid>(ChampViewModelSel);
错误是 Nullreference
当它检查 IsAssginableFrom
时,因为在 VS2015 中它找到了一个 Canvas 而不是在 VS2013 中找到的希望的 Grid?
堆栈跟踪
StackTrace " at Microsoft.CSharp.RuntimeBinder.SymbolTable.GetOriginalTypeParameterType(Type t)\r\n at Microsoft.CSharp.RuntimeBinder.SymbolTable.AreTypeParametersEquivalent(Type t1, Type t2)\r\n at Microsoft.CSharp.RuntimeBinder.SymbolTable.LoadMethodTypeParameter(MethodSymbol parent, Type t)\r\n at Microsoft.CSharp.RuntimeBinder.SymbolTable.LoadSymbolsFromType(Type originalType)\r\n at Microsoft.CSharp.RuntimeBinder.SymbolTable.AddMethodToSymbolTable(MemberInfo member, AggregateSymbol callingAggregate, MethodKindEnum kind)\r\n at Microsoft.CSharp.RuntimeBinder.SymbolTable.AddNamesInInheritanceHierarchy(String name, BindingFlags flags, List 1 inheritance)\r\n at Microsoft.CSharp.RuntimeBinder.SymbolTable.PopulateSymbolTableWithName(String name, IEnumerable 1 typeArguments, Type callingType)\r\n at Microsoft.CSharp.RuntimeBinder.RuntimeBinder.PopulateSymbolTableWithPayloadInformation(DynamicMetaObjectBinder payload, Type callingType, ArgumentObject[] arguments)\r\n at Microsoft.CSharp.RuntimeBinder.RuntimeBinder.BindCore(DynamicMetaObjectBinder payload, IEnumerable 1 parameters, DynamicMetaObject[] args, DynamicMetaObject& deferredBinding)\r\n at Microsoft.CSharp.RuntimeBinder.RuntimeBinder.Bind(DynamicMetaObjectBinder payload, IEnumerable 1 parameters, DynamicMetaObject[] args, DynamicMetaObject& deferredBinding)\r\n at Microsoft.CSharp.RuntimeBinder.BinderHelper.Bind(DynamicMetaObjectBinder action, RuntimeBinder binder, IEnumerable 1 args, IEnumerable 1 arginfos, DynamicMetaObject onBindingError)\r\n at Microsoft.CSharp.RuntimeBinder.CSharpInvokeMemberBinder.FallbackInvokeMember(DynamicMetaObject target, DynamicMetaObject[] args, DynamicMetaObject errorSuggestion)\r\n at System.Dynamic.DynamicMetaObject.BindInvokeMember(InvokeMemberBinder binder, DynamicMetaObject[] args)\r\n at System.Dynamic.InvokeMemberBinder.Bind(DynamicMetaObject target, DynamicMetaObject[] args)\r\n at System.Dynamic.DynamicMetaObjectBinder.Bind(Object[] args, ReadOnlyCollection 1 parameters, LabelTarget returnLabel)\r\n at System.Runtime.CompilerServices.CallSiteBinder.BindCore[T](CallSite 1 site, Object[] args)\r\n at System.Dynamic.UpdateDelegates.UpdateAndExecute2[T0,T1,TRet](CallSite site, T0 arg0, T1 arg1)\r\n at BC_Game.ViewModel.ChampionViewModel.FindParentOfType[T](DependencyObject o)\r\n at BC_Game.ViewModel.ChampionViewModel.ManStart(ManipulationStartedEventArgs e)" string
更新
在Win10上安装了VS2013,问题依旧。 VS2013 在 Win8.1 上运行良好
更新
来自 Visual Studio 2013 wp 8.1
C:\Program Files (x86)\MSBuild\12.0\bin\Csc.exe /noconfig /nowarn:1701,1702,2008 /nostdlib+ /errorreport:prompt /warn:4 /define:DEBUG;TRACE /errorendlocation /preferreduilang:en-US /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\Microsoft.CSharp.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Core.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Net.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Runtime.Serialization.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.ServiceModel.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.ServiceModel.Web.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Windows.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Xml.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Xml.Linq.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Xml.Serialization.dll" /debug+ /debug:full /filealign:512 /optimize- /out:obj\Debug\LibraryOfModels.dll /target:library /utf8output BuyMenuClass.cs CastleModel.cs ChampionModel.cs ChatDTO.cs CollectionCombiner.cs Country.cs CurrentUser.cs DecorationListItems.cs GameDTO.cs MapTransform.cs MarketplaceModel.cs MenuFirstPageModel.cs NotifyBase.cs Player.cs PopupColorPickerModel.cs PopupExtraInfoModel.cs PopUpModel.cs Properties\AssemblyInfo.cs RankingDTO.cs RankingModel.cs ShieldGearModel.cs UnitModel.cs UserDTO.cs WarCalculations.cs "C:\Users\Jonas\AppData\Local\Temp.NETPortable,Version=v4.0,Profile=Profile158.AssemblyAttributes.cs"
来自 VS 2015 Win 10
C:\Program Files (x86)\MSBuild\14.0\bin\csc.exe /noconfig /nowarn:1701,1702,2008 /nostdlib+ /errorreport:prompt /warn:4 /define:DEBUG;TRACE /errorendlocation /preferreduilang:en-US /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\Microsoft.CSharp.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Core.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Net.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Runtime.Serialization.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.ServiceModel.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.ServiceModel.Web.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Windows.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Xml.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Xml.Linq.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETPortable\v4.0\Profile\Profile158\System.Xml.Serialization.dll" /debug+ /debug:full /filealign:512 /optimize- /out:obj\Debug\LibraryOfModels.dll /ruleset:"C:\Program Files (x86)\Microsoft Visual Studio 14.0\Team Tools\Static Analysis Tools\Rule Sets\MinimumRecommendedRules.ruleset" /target:library /utf8output BuyMenuClass.cs CastleModel.cs ChampionModel.cs ChatDTO.cs CollectionCombiner.cs Country.cs CurrentUser.cs DecorationListItems.cs GameDTO.cs MapTransform.cs MarketplaceModel.cs MenuFirstPageModel.cs NotifyBase.cs Player.cs PopupColorPickerModel.cs PopupExtraInfoModel.cs PopUpModel.cs Properties\AssemblyInfo.cs RankingDTO.cs RankingModel.cs ShieldGearModel.cs UnitModel.cs UserDTO.cs WarCalculations.cs "C:\Users\johann\AppData\Local\Temp.NETPortable,Version=v4.0,Profile=Profile158.AssemblyAttributes.cs"
我们可以看到两者之间的唯一区别是所使用的 .NetFrameworks。一个使用版本 4.5.51650,另一个使用 4.6.01038。
更新
看来最新的 win 10 更新已经解决了这个问题。
最佳答案
您可以尝试通过此链接更改您的 .net 版本。
https://msdn.microsoft.com/en-us/library/gg597391(v=vs.110).aspx
我认为这可能是 .net 版本问题,但我不确定它会对您的应用产生什么影响。
关于c# - 在 VS 2015 和 VS 2013 上运行同一段代码时出现问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36955369/