更新到netcore3.0-preview8后的Blazor Mono客户端错误 [英] Blazor Mono Clientside Error after updating to netcore3.0-preview8

问题描述

我已将blazor客户端项目项目从Preview7更新为Preview 8，与Visual Studio 2019兼容.

我已按照此处详细说明进行操作；

最后，我的 .csproj 是

 < Project Sdk ="Microsoft.NET.Sdk.Web">< PropertyGroup>< TargetFramework> netcoreapp3.0</TargetFramework>< OutputType> Exe</OutputType>< LangVersion> 7.3</LangVersion>< RazorLangVersion> 3.0</RazorLangVersion></PropertyGroup>< PropertyGroup Condition ='$(配置)| $(平台)'=='Debug | AnyCPU'">< OutputPath></OutputPath></PropertyGroup>< ItemGroup>< PackageReference Include ="Blazored.LocalStorage" Version ="2.0.12"/>< PackageReference Include ="Microsoft.AspNetCore.Blazor" Version ="3.0.0-preview8.19405.7"/>< PackageReference Include ="Microsoft.AspNetCore.Blazor.Build" Version ="3.0.0-preview8.19405.7" PrivateAssets ="all"/>< PackageReference Include ="Microsoft.AspNetCore.Blazor.HttpClient" Version ="3.0.0-preview8.19405.7"/>< PackageReference Include ="Newtonsoft.Json" Version ="12.0.3-beta1"/></ItemGroup>< ItemGroup>< ProjectReference Include =".. \ OakfieldLeasing.Blazor.Shared \ OakfieldLeasing.Blazor.Shared.csproj"/></ItemGroup>< ItemGroup>< Folder Include ="wwwroot \ images \"/></ItemGroup></Project> 

我还尝试用 Microsoft.AspNetCore.NewtonsoftJson Nuget包替换 Newtonsoft.Json ，但这似乎没有什么作用.

请问有人对造成这种情况的原因有任何想法吗?

解决方案

问题来自误读升级博客和文档.

此处的博客

ASP.NET Core and Blazor updates in .NET Core 3.0 Preview 8

However, when I build the solution get the following error;

Fatal error in IL Linker 5> 5>Unhandled Exception: Mono.Linker.Steps.XmlResolutionException: Failed to process XML description: ---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'Microsoft.AspNetCore.Mvc.Core, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' ---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'Microsoft.AspNetCore.Mvc.Core, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' 5> at Mono.Linker.DirectoryAssemblyResolver.Resolve(AssemblyNameReference name, ReaderParameters parameters) 5> at Mono.Linker.AssemblyResolver.Resolve(AssemblyNameReference name, ReaderParameters parameters) 5> at Mono.Linker.LinkContext.Resolve(IMetadataScope scope) 5> --- End of inner exception stack trace --- 5> at Mono.Linker.LinkContext.Resolve(IMetadataScope scope) 5> at Mono.Linker.LinkContext.ResolveReferences(AssemblyDefinition assembly) 5> at Mono.Linker.Steps.ResolveFromXmlStep.ProcessAssemblies(LinkContext context, XPathNodeIterator iterator) 5> at Mono.Linker.Steps.ResolveFromXmlStep.Process() 5> --- End of inner exception stack trace --- 5> at Mono.Linker.Steps.ResolveFromXmlStep.Process() 5> at Mono.Linker.Steps.BaseStep.Process(LinkContext context) 5> at Mono.Linker.Pipeline.ProcessStep(LinkContext context, IStep step) 5>
at Mono.Linker.Pipeline.Process(LinkContext context) 5> at Mono.Linker.Driver.Run(ILogger customLogger) 5> at Mono.Linker.Driver.Execute(String[] args, ILogger customLogger) 5>
at Mono.Linker.Driver.Main(String[] args) 5>C:\Users\matt.nuget\packages\microsoft.aspnetcore.blazor.build\3.0.0-preview8.19405.7\targets\Blazor.MonoRuntime.targets(441,5): error MSB3073: The command "dotnet "C:\Users\matt.nuget\packages\microsoft.aspnetcore.blazor.mono\3.0.0-preview8.19380.1\build\netstandard1.0../../tools/illink/illink.dll" -l none --disable-opt unreachablebodies --verbose --strip-security true --exclude-feature com --exclude-feature sre -v false -c link -u link -b true -d "C:\Users\matt.nuget\packages\microsoft.aspnetcore.blazor.mono\3.0.0-preview8.19380.1\build\netstandard1.0../../tools/mono/bcl/" -d "C:\Users\matt.nuget\packages\microsoft.aspnetcore.blazor.mono\3.0.0-preview8.19380.1\build\netstandard1.0../../tools/mono/bcl/Facades/" -o "C:\Users\matt\Source\Repos\OakfieldLeasing\OakfieldLeasing.Blazor.Client\obj\Debug\netcoreapp3.0\blazor\linker/" -x "C:\Users\matt.nuget\packages\microsoft.aspnetcore.blazor.build\3.0.0-preview8.19405.7\targets\BuiltInBclLinkerDescriptor.xml" -x "C:\Users\matt\Source\Repos\OakfieldLeasing\OakfieldLeasing.Blazor.Client\obj\Debug\netcoreapp3.0\blazor\linker.descriptor.xml" -a "C:\Users\matt.nuget\packages\blazored.localstorage\2.0.12\lib\netstandard2.0\Blazored.LocalStorage.dll" -a "C:\Users\matt.nuget\packages\microsoft.aspnetcore.blazor\3.0.0-preview8.19405.7\lib\netstandard2.0\Microsoft.AspNetCore.Blazor.dll" -a "C:\Users\matt.nuget\packages\microsoft.aspnetcore.blazor.httpclient\3.0.0-preview8.19405.7\lib\netstandard2.0\Microsoft.AspNetCore.Blazor.HttpClient.dll" -a "C:\Users\matt.nuget\packages\mono.webassembly.interop\3.0.0-preview8.19405.4\lib\netstandard2.0\Mono.WebAssembly.Interop.dll" -a "C:\Users\matt.nuget\packages\newtonsoft.json\12.0.3-beta1\lib\netstandard2.0\Newtonsoft.Json.dll" -a "C:\Users\matt\Source\Repos\OakfieldLeasing\OakfieldLeasing.Blazor.Shared\bin\Debug\netstandard2.1\OakfieldLeasing.Blazor.Shared.dll" -a "C:\Users\matt\Source\Repos\OakfieldLeasing\OakfieldLeasing.Blazor.Client\obj\Debug\netcoreapp3.0\OakfieldLeasing.Blazor.Client.dll"" exited with code -532462766.

The only other project being referenced by the Blazor Client side project is the Shared project which references .Net Standard 2.1.

I have the following listed in my dependencies -> analyzers on the Blazor Client project.

Finally my .csproj is

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <OutputType>Exe</OutputType>
    <LangVersion>7.3</LangVersion>
    <RazorLangVersion>3.0</RazorLangVersion>
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
    <OutputPath></OutputPath>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Blazored.LocalStorage" Version="2.0.12" />
    <PackageReference Include="Microsoft.AspNetCore.Blazor" Version="3.0.0-preview8.19405.7" />
    <PackageReference Include="Microsoft.AspNetCore.Blazor.Build" Version="3.0.0-preview8.19405.7" PrivateAssets="all" />
    <PackageReference Include="Microsoft.AspNetCore.Blazor.HttpClient" Version="3.0.0-preview8.19405.7" />
<PackageReference Include="Newtonsoft.Json" Version="12.0.3-beta1" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\OakfieldLeasing.Blazor.Shared\OakfieldLeasing.Blazor.Shared.csproj" />
  </ItemGroup>

  <ItemGroup>
    <Folder Include="wwwroot\images\" />
  </ItemGroup>

</Project>

I have also tried replacing the Newtonsoft.Json with Microsoft.AspNetCore.NewtonsoftJson Nuget package, but this doesn't seem to make a difference.

Does anyone have any idea on what could be causing this please?

解决方案

The issue has come from misreading the upgrade blog and documentation.

The blog here

ASP.NET Core and Blazor updates in .NET Core 3.0 Preview 8

In turn refers to Steve Sandersons migration steps here;

Migrate from ASP.NET Core 2.2 to 3.0

which is for porting from 2.2 to 3.0 and references aslter the .csproj to <TargetFramework>netcoreapp3.0</TargetFramework>

which I had wrongly done to the client project. Which is not valid because Mono WebAssembly runs as netstandard2.0, not netcoreapp3.0.

Reverting the .csproj back to netstandard2.0 fixed the issue.

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