在VS 2015和VS 2013上运行相同代码的问题

在Visual Studio 2013和2015中运行一段代码时，我得到两个不同的结果 . 在Visual Studio 2015上，我获得了NullReference，并且在2013年它的工作方式应该如此 . Visual Studio 2015也在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);
}

调用代码：

Grid RiskGrid = FindParentOfType<Grid>(ChampViewModelSel);

当它检查 IsAssginableFrom 时错误是 Nullreference ，因为在VS2015中它找到了Canvas而不是在VS2013中找到的希望网格？

Stack Trace

StackTrace“at Microsoft.CSharp.RuntimeBinder.SymbolTable.GetOriginalTypeParameterType（Type t）\ r \ n
在Microsoft.CSharp.RuntimeBinder.SymbolTable.AreTypeParametersEquivalent（类型t1，类型t2）\ r \ n
在Microsoft.CSharp.RuntimeBinder.SymbolTable.LoadMethodTypeParameter（MethodSymbol parent，Type t）\ r \ n
在Microsoft.CSharp.RuntimeBinder.SymbolTable.LoadSymbolsFromType（Type originalType）\ r \ n
在Microsoft.CSharp.RuntimeBinder.SymbolTable.AddMethodToSymbolTable（MemberInfo成员，AggregateSymbol callingAggregate，MethodKindEnum类）\ 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
在Microsoft.CSharp.RuntimeBinder.RuntimeBinder.PopulateSymbolTableWithPayloadInformation（DynamicMetaObjectBinder payload，Type callingType，ArgumentObject [] arguments）\ r \ n
在Microsoft.CSharp.RuntimeBinder.RuntimeBinder.BindCore（DynamicMetaObjectBinder有效负载，IEnumerable 1参数，DynamicMetaObject [] args，DynamicMetaObject和deferredBinding）\ r \ n
在Microsoft.CSharp.RuntimeBinder.RuntimeBinder.Bind（DynamicMetaObjectBinder有效负载，IEnumerable 1参数，DynamicMetaObject [] args，DynamicMetaObject和deferredBinding）\ r \ n
在Microsoft.CSharp.RuntimeBinder.BinderHelper.Bind（DynamicMetaObjectBinder action，RuntimeBinder binder，IEnumerable 1 args，IEnumerable 1 arginfos，DynamicMetaObject onBindingError）\ r \ n
在Microsoft.CSharp.RuntimeBinder.CSharpInvokeMemberBinder.FallbackInvokeMember（DynamicMetaObject target，DynamicMetaObject [] args，DynamicMetaObject errorSuggestion）\ r \ n
在System.Dynamic.DynamicMetaObject.BindInvokeMember（InvokeMemberBinder binder，DynamicMetaObject [] args）\ r \ n
在System.Dynamic.InvokeMemberBinder.Bind（DynamicMetaObject target，DynamicMetaObject [] args）\ r \ n
在System.Dynamic.DynamicMetaObjectBinder.Bind（Object [] args，ReadOnlyCollection 1参数，LabelTarget returnLabel）\ r \ n
在System.Runtime.CompilerServices.CallSiteBinder.BindCore [T]（CallSite 1 site，Object [] args）\ r \ n
在System.Dynamic.UpdateDelegates.UpdateAndExecute2 [T0，T1，TRet]（CallSite站点，T0 arg0，T1 arg1）\ r \ n
在BC_Game.ViewModel.ChampionViewModel.FindParentOfType [T]（DependencyObject o）\ r \ n
at BC_Game.ViewModel.ChampionViewModel.ManStart（ManipulationStartedEventArgs e）“string

Update

在Win10上安装VS2013，问题仍然存在 . VS2013在Win8.1上运行良好

update

从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）\参考程序集\ 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：\程序文件（x86）\参考程序集\ 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 Assem blies \ 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 ShieldGearMode l.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）\参考程序集\ 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：\程序文件（x86）\参考程序集\ 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 Assem blies \ 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”

我们在两者之间可以看到的唯一区别是正在使用的.NetFrameworks . 一个版本为4.5.51650，另一个版本为4.6.01038 .

Update

似乎最新的PC 10胜利更新已经解决了这个问题 .