运行MRTK2项目会显示“无法解析System.Reflection.BindingFlags”

Question

I am trying to port my project over from Unity 2017 LTS to 2018 LTS and MRTK2. Everything was going pretty smoothly until I tried to run the project on an HoloLens 1 emulator.

I get the following error:

1>  System.Exception: Failed to resolve System.Reflection.BindingFlags
1>     at Unity.ModuleContext.Retarget(TypeReference type, GenericContext context)
1>     at Unity.ModuleContext.Retarget(MethodReference method, GenericContext context)
1>     at Unity.FixReferencesStep.Visit(MethodDefinition method, GenericContext context)
1>     at Unity.FixReferencesStep.Visit(TypeDefinition type)
1>     at Unity.TypeDefinitionDispatcher.DispatchType(TypeDefinition type)
1>     at Unity.TypeDefinitionDispatcher.DispatchType(TypeDefinition type)
1>     at Unity.TypeDefinitionDispatcher..ctor(ModuleDefinition module, ITypeDefinitionVisitor visitor)
1>     at Unity.FixReferencesStep.ProcessModule()
1>     at Unity.ModuleStep.Execute()
1>     at Unity.FixReferencesStep.Execute()
1>     at Unity.Step.Execute(OperationContext operationContext, IStepContext previousStepContext)
1>     at Unity.Operation.Execute()
1>     at Unity.Program.Main(String[] args)

Searching for this error gave me nothing, I have not changed the project that Unity builds. I am running it in Debug and for x86 . I am building through the normal Unity Build window.

Using Minimum Platform Version 10.0.17134.0 and Target SDK Version 10.0.18362.0

This also happens with a new empty Unity project, building an example will also give this error.

Answer 1

我遇到了类似的问题，并且要解决此问题，我将其更改为il2cpp后端。

Answer 2

Realizing this may not just have been me, I submitted an issue in the MRTK github . It turns out this is a bug in Visual Studio, and they are working on resolving it with Microsoft.

There's two ways to solve it , either target Windows version 15063 as the min version or change the yourpoject .csproj.

If you don't want to change the min version these are the steps to take:

1. Open yourproject .csproj in a texteditor

2. Find the line <Target Name="BeforeResolveReferences" Condition="'$(BuildingProject)' == 'true'">

3. Replace with:

    <UsingTask TaskName="FixProjectJson" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\\Microsoft.Build.Tasks.Core.dll"> <ParameterGroup /> <Task> <Using Namespace="System" /> <Using Namespace="System.IO" /> <Code Type="Fragment" Language="cs"> <![CDATA[File.WriteAllText("project.lock.json", File.ReadAllText("project.lock.json").Replace("ref/netstandard1.5/System.Reflection.TypeExtensions.dll", "ref/netstandard1.3/System.Reflection.TypeExtensions.dll"));]]> </Code> </Task> </UsingTask> <Target Name="BeforeResolveReferences" Condition="'$(BuildingProject)' == 'true'"> 

4. Find the line <Message Importance="high" Text="Running AssemblyConverter..." />

5. Replace with:

    <Message Importance="high" Text="Running AssemblyConverter..." /> <FixProjectJson /> 

After doing this, my project finally compiled and I was able to run it in the HoloLens 2 Emulator.