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c# - IL Linker 在尝试编译 Blazor 的客户端时崩溃

问题描述

描述错误

我无法运行Blazor - blazorhosted 应用程序（作为一个整体）

我无法编译Blazor.Client 端。

首先 - 发生了这个错误

Severity    Code    Description Project File    Line    Suppression State
Error   MSB3073 The command "dotnet "C:\Admins\Admin\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\../tools/illink/illink.dll" 
-l none --verbose --strip-security true --exclude-feature com --exclude-feature sre -v false -c link -u link -b true -d "C:\Admins\Admin\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\../tools/mono/bcl/" -d "C:\Admins\Admin\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\../tools
/mono/bcl/Facades/" -o "C:\Repo\Project\Blazor\Blazor.Client\obj\Debug\netstandard2.0\blazor\linker/" -x 
"C:\Admins\Admin\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\BuiltInBclLinkerDescriptor.xml" 
-x "C:\Repo\Project\Blazor\Blazor.Client\obj\Debug\netstandard2.0\blazor\linker.descriptor.xml" -a 
"C:\Admins\Admin\.nuget\packages\microsoft.aspnetcore.blazor\0.7.0\lib\netstandard2.0
\Microsoft.AspNetCore.Blazor.dll" -a "C:\Admins\Admin\.nuget\packages\microsoft.aspnetcore.blazor.browser\0.7.0\lib\netstandard2.0\Microsoft.AspNetCore.Blazor.Browser.dll" -a "C:\Admins\Admin\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\lib\netstandard1.0\Microsoft.AspNetCore.Blazor.TagHelperWorkaround.dll" -a "C:\Admins\Admin\.nuget\packages\microsoft.extensions.dependencyinjection\2.1.0\lib\netstandard2.0\Microsoft.Extensions.DependencyInjection.dll" -a "C:\Admins\Admin\.nuget\packages\microsoft.extensions.dependencyinjection.abstractions\2.1.0\lib\netstandard2.0
\Microsoft.Extensions.DependencyInjection.Abstractions.dll" -a "C:\Admins\Admin\.nuget\packages
\microsoft.jsinterop\0.7.0\lib\netstandard2.0\Microsoft.JSInterop.dll" -a "C:\Admins\Admin\.nuget
\packages\mono.webassembly.interop\0.7.0\lib\netstandard2.0\Mono.WebAssembly.Interop.dll" -a "C:\Program Files\dotnet\sdk\NuGetFallbackFolder\system.componentmodel.annotations\4.5.0
\lib\netstandard2.0\System.ComponentModel.Annotations.dll" -a "C:\Repo\Project\Blazor\Blazor.Shared
\bin\Debug\netstandard2.0\Blazor.Shared.dll" -a "C:\Repo\Project\Blazor\Blazor.Shared\bin\Debug\netstandard2.0\Microsoft.AspNetCore.Http.Features.dll" -a "C:\Repo\Project\Blazor\Blazor.Client
\obj\Debug\netstandard2.0\Blazor.Client.dll"" exited with code 1.   Blazor.Client   C:\Admins\Admin\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\Blazor.MonoRuntime.targets  439

然后：

Exception thrown: 'System.ArgumentException' in System.IO.FileSystem.Watcher.dll
An exception of type 'System.ArgumentException' occurred in System.IO.FileSystem.Watcher.dll but was not handled in user code

System.ArgumentException: 'The directory name 'C:\Repo\Project\Blazor\Blazor.Client\bin\Debug\netstandard2.0\dist\' does not exist.'

尝试仅编译客户端时

1>------ Rebuild All started: Project: Blazor.Shared, Configuration: Debug Any CPU ------
1>C:\Program Files\dotnet\sdk\2.1.600-preview-009426\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(143,5): message NETSDK1057: You are working with a preview version of the .NET Core SDK. You can define the SDK version via a global.json file in the current project. More at https://go.microsoft.com/fwlink/?linkid=869452
1>Blazor.Shared -> C:\Repo\Project\Blazor\Blazor.Shared\bin\Debug\netstandard2.0\Blazor.Shared.dll
2>------ Rebuild All started: Project: Blazor.Client, Configuration: Debug Any CPU ------
2>Blazor.Client -> C:\Repo\Project\Blazor\Blazor.Client\bin\Debug\netstandard2.0\Blazor.Client.dll
2>Fatal error in IL Linker
2>Mono.Linker.LoadException: Error while processing references of 'Blazor.Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' ---> Mono.Linker.LoadException: Error while processing references of 'Blazor.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' ---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'Microsoft.Extensions.Primitives, Version=2.1.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' ---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'Microsoft.Extensions.Primitives, Version=2.1.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'
2>   at Mono.Linker.DirectoryAssemblyResolver.Resolve(AssemblyNameReference name, ReaderParameters parameters)
2>   at Mono.Linker.AssemblyResolver.Resolve(AssemblyNameReference name, ReaderParameters parameters)
2>   at Mono.Linker.LinkContext.Resolve(IMetadataScope scope)
2>   --- End of inner exception stack trace ---
2>   at Mono.Linker.LinkContext.Resolve(IMetadataScope scope)
2>   at Mono.Linker.LinkContext.ResolveReferences(AssemblyDefinition assembly)
2>   at Mono.Linker.Steps.LoadReferencesStep.ProcessReferences(AssemblyDefinition assembly)
2>   at Mono.Linker.Steps.LoadReferencesStep.ProcessReferences(AssemblyDefinition assembly)
2>   --- End of inner exception stack trace ---
2>   at Mono.Linker.Steps.LoadReferencesStep.ProcessReferences(AssemblyDefinition assembly)
2>   at Mono.Linker.Steps.LoadReferencesStep.ProcessReferences(AssemblyDefinition assembly)
2>   --- End of inner exception stack trace ---
2>   at Mono.Linker.Steps.LoadReferencesStep.ProcessReferences(AssemblyDefinition assembly)
2>   at Mono.Linker.Steps.LoadReferencesStep.ProcessAssembly(AssemblyDefinition assembly)
2>   at Mono.Linker.Steps.BaseStep.Process(LinkContext context)
2>   at Mono.Linker.Pipeline.ProcessStep(LinkContext context, IStep step)
2>   at Mono.Linker.Pipeline.Process(LinkContext context)
2>   at Mono.Linker.Driver.Run(ILogger customLogger)
2>   at Mono.Linker.Driver.Execute(String[] args, ILogger customLogger)
2>C:\Users\Admin\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\Blazor.MonoRuntime.targets(439,5): error MSB3073: The command "dotnet "C:\Users\User\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\../tools/illink/illink.dll" -l none --verbose --strip-security true --exclude-feature com --exclude-feature sre -v false -c link -u link -b true -d "C:\Users\User\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\../tools/mono/bcl/" -d "C:\Users\User\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\../tools/mono/bcl/Facades/" -o "C:\Repo\Project\Blazor\Blazor.Client\obj\Debug\netstandard2.0\blazor\linker/" -x "C:\Users\User\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets\BuiltInBclLinkerDescriptor.xml" -x "C:\Repo\Project\Blazor\Blazor.Client\obj\Debug\netstandard2.0\blazor\linker.descriptor.xml" -a "C:\Users\User\.nuget\packages\microsoft.aspnetcore.blazor\0.7.0\lib\netstandard2.0\Microsoft.AspNetCore.Blazor.dll" -a "C:\Users\User\.nuget\packages\microsoft.aspnetcore.blazor.browser\0.7.0\lib\netstandard2.0\Microsoft.AspNetCore.Blazor.Browser.dll" -a "C:\Users\User\.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\lib\netstandard1.0\Microsoft.AspNetCore.Blazor.TagHelperWorkaround.dll" -a "C:\Users\User\.nuget\packages\microsoft.extensions.dependencyinjection\2.1.0\lib\netstandard2.0\Microsoft.Extensions.DependencyInjection.dll" -a "C:\Users\User\.nuget\packages\microsoft.extensions.dependencyinjection.abstractions\2.1.0\lib\netstandard2.0\Microsoft.Extensions.DependencyInjection.Abstractions.dll" -a "C:\Users\User\.nuget\packages\microsoft.jsinterop\0.7.0\lib\netstandard2.0\Microsoft.JSInterop.dll" -a "C:\Users\User\.nuget\packages\mono.webassembly.interop\0.7.0\lib\netstandard2.0\Mono.WebAssembly.Interop.dll" -a "C:\Program Files\dotnet\sdk\NuGetFallbackFolder\system.componentmodel.annotations\4.5.0\lib\netstandard2.0\System.ComponentModel.Annotations.dll" -a "C:\Repo\Project\Blazor\Blazor.Shared\bin\Debug\netstandard2.0\Blazor.Shared.dll" -a "C:\Repo\Project\Blazor\Blazor.Shared\bin\Debug\netstandard2.0\Microsoft.AspNetCore.Http.Features.dll" -a "C:\Repo\Project\Blazor\Blazor.Client\obj\Debug\netstandard2.0\Blazor.Client.dll"" exited with code 1.
2>Done building project "Blazor.Client.csproj" -- FAILED.
========== Rebuild All: 1 succeeded, 1 failed, 0 skipped ==========

双击此错误后，它会打开：

Blazor.MonoRuntime.targets

在

C:\Users\Admin.nuget\packages\microsoft.aspnetcore.blazor.build\0.7.0\targets

和这条线上的点：

<!--` Run the linker and put the results in /obj/<<configuration>>/<<targetframework>>/blazor/blazor/linker -->
    <Exec Command="dotnet &quot;$(MonoLinkerPath)&quot; $(_BlazorLinkerAdditionalOptions) @(_BlazorFolderLookupPaths, ' ') -o &quot;$(BlazorIntermediateLinkerOutputPath)&quot; @(_BlazorAssemblyDescriptorFiles, ' ') @(_BlazorAssembliesToLink, ' ')"  />

重现

重现行为的步骤：

大概：

1 安装.NET 2.1.600-preview-009426

2 安装 Visual Studio 2019

3 创建dotnet new blazorhosted

4 尝试运行应用程序。

  1. 查看错误

预期行为

应用程序正常启动

额外的

我用 Win7 在 2 台不同的 PC 上重现了这个错误。

在这两种情况下，场景实际上是相同的。

标签： c#asp.net-coreblazor

解决方案

如果你想调试 ILLink，我推荐以下步骤

  • 从最新的源代码编译 ILLink
  • 更新 Blazor.Build 包中的 ILLink 以获得更好的调试消息。

然后你就会知道类型解析是如何失败的。此外，如果您遇到此类错误，很可能您正在使用反射或其他方式进行动态类型解析，这会破坏 ILLink。您应该开始手动选择退出 ILLink 消除的特定类型。

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