[备忘] 解决 rzc discover exited with code -2147450730 问题

现象：

　　本地可以正常编译和使用，用 Azure DevOps 进行 CI 时出错

重现：

　　项目代码：

<Project Sdk="Microsoft.NET.Sdk.Razor">
    <PropertyGroup>
        <TargetFrameworks>netcoreapp3.1</TargetFrameworks>
...

　　YAML 配置：

trigger:
- master

pool:
  vmImage: 'windows-latest'

variables:
  solution: '**/Senparc.Xncf.WeixinManager.sln'
  buildPlatform: 'Any CPU'
  buildConfiguration: 'Release'

steps:

- task: UseDotNet@2
  displayName: 'Use .NET SDK 3.1'
  inputs:
    version: '3.1.x'
    packageType: 'sdk'


- task: DotNetCoreCLI@2
  displayName: Build
  inputs:
    command: build
    projects: '**/Senparc.Xncf.WeixinManager.sln'
    arguments: '--configuration Release'

　　编译日志记录：

Starting: Build
==============================================================================
Task         : .NET Core
Description  : Build, test, package, or publish a dotnet application, or run a custom dotnet command
Version      : 2.187.0
Author       : Microsoft Corporation
Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/build/dotnet-core-cli
==============================================================================
C:Windowssystem32chcp.com 65001
Active code page: 65001
Info: .NET Core SDK/runtime 2.2 and 3.0 are now End of Life(EOL) and have been removed from all hosted agents. If you're using these SDK/runtimes on hosted agents, kindly upgrade to newer versions which are not EOL, or else use UseDotNet task to install the required version.
C:hostedtoolcachewindowsdotnetdotnet.exe build D:a1ssrcSenparc.Xncf.WeixinManager.sln "-dl:CentralLogger,"D:a\_tasksDotNetCoreCLI_5541a522-603c-47ad-91fc-a4b1d163081b2.187.0dotnet-build-helpersMicrosoft.TeamFoundation.DistributedTask.MSBuild.Logger.dll"*ForwardingLogger,"D:a\_tasksDotNetCoreCLI_5541a522-603c-47ad-91fc-a4b1d163081b2.187.0dotnet-build-helpersMicrosoft.TeamFoundation.DistributedTask.MSBuild.Logger.dll"" --configuration Release
Microsoft (R) Build Engine version 16.10.2+857e5a733 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  Restored D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj (in 1.12 min).
  Restored D:a1ssrcSenparc.Xncf.WeixinManager.TestsSenparc.Xncf.WeixinManager.Tests.csproj (in 1.12 min).
##[warning]C:hostedtoolcachewindowsdotnetsdk5.0.302SdksMicrosoft.NET.Sdk.Razoruild
etstandard2.0Sdk.Razor.CurrentVersion.targets(416,5): Warning RAZORSDK1006: Detected Razor language version downgrade. This is typically caused by a reference to the Microsoft.AspNetCore.Razor.Design package. Consider removing this package reference.
C:hostedtoolcachewindowsdotnetsdk5.0.302SdksMicrosoft.NET.Sdk.Razoruild
etstandard2.0Sdk.Razor.CurrentVersion.targets(416,5): warning RAZORSDK1006: Detected Razor language version downgrade. This is typically caused by a reference to the Microsoft.AspNetCore.Razor.Design package. Consider removing this package reference. [D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj]
##[warning]srcSenparc.Xncf.WeixinManagerModelsDatabaseModelDtoWeixinUserDto.cs(63,23): Warning CS0108: 'WeixinUserDto.Remark' hides inherited member 'DtoBase.Remark'. Use the new keyword if hiding was intended.
D:a1ssrcSenparc.Xncf.WeixinManagerModelsDatabaseModelDtoWeixinUserDto.cs(63,23): warning CS0108: 'WeixinUserDto.Remark' hides inherited member 'DtoBase.Remark'. Use the new keyword if hiding was intended. [D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj]
##[warning]srcSenparc.Xncf.WeixinManagerModelsDatabaseModelWeixinUser.cs(71,23): Warning CS0108: 'WeixinUser.Remark' hides inherited member 'EntityBase<int>.Remark'. Use the new keyword if hiding was intended.
D:a1ssrcSenparc.Xncf.WeixinManagerModelsDatabaseModelWeixinUser.cs(71,23): warning CS0108: 'WeixinUser.Remark' hides inherited member 'EntityBase<int>.Remark'. Use the new keyword if hiding was intended. [D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj]
##[warning]srcSenparc.Xncf.WeixinManagerAreasAdminPagesWeixinManagerWeixinUserIndex.cshtml.cs(44,42): Warning CS1998: This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.
D:a1ssrcSenparc.Xncf.WeixinManagerAreasAdminPagesWeixinManagerWeixinUserIndex.cshtml.cs(44,42): warning CS1998: This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread. [D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj]
##[warning]srcSenparc.Xncf.WeixinManagerRegister.cs(189,13): Warning CS0162: Unreachable code detected
D:a1ssrcSenparc.Xncf.WeixinManagerRegister.cs(189,13): warning CS0162: Unreachable code detected [D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj]
##[warning]srcSenparc.Xncf.WeixinManagerRegister.Middleware.cs(83,46): Warning CS0168: The variable 'ex' is declared but never used
D:a1ssrcSenparc.Xncf.WeixinManagerRegister.Middleware.cs(83,46): warning CS0168: The variable 'ex' is declared but never used [D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj]
##[warning]srcSenparc.Xncf.WeixinManagerAreasAdminPagesWeixinManagerWeixinUserIndex.cshtml.cs(28,21): Warning CS0414: The field 'WeixinUser_IndexModel.pageCount' is assigned but its value is never used
D:a1ssrcSenparc.Xncf.WeixinManagerAreasAdminPagesWeixinManagerWeixinUserIndex.cshtml.cs(28,21): warning CS0414: The field 'WeixinUser_IndexModel.pageCount' is assigned but its value is never used [D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj]
##[warning]CSC(0,0): Warning AD0001: Analyzer 'Microsoft.AspNetCore.Mvc.Analyzers.TopLevelParameterNameAnalyzer' threw an exception of type 'System.NullReferenceException' with message 'Object reference not set to an instance of an object.'.
CSC : warning AD0001: Analyzer 'Microsoft.AspNetCore.Mvc.Analyzers.TopLevelParameterNameAnalyzer' threw an exception of type 'System.NullReferenceException' with message 'Object reference not set to an instance of an object.'. [D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj]
  It was not possible to find any compatible framework version
  The framework 'Microsoft.NETCore.App', version '2.0.9' was not found.
    - The following frameworks were found:
        5.0.8 at [C:hostedtoolcachewindowsdotnetsharedMicrosoft.NETCore.App]
  
  You can resolve the problem by installing the specified framework and/or SDK.
  
  The specified framework can be found at:
    - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=2.0.9&arch=x64&rid=win10-x64
##[error]C:UsersVssAdministrator.nugetpackagesmicrosoft.aspnetcore.razor.design2.2.0uild
etstandard2.0Microsoft.AspNetCore.Razor.Design.CodeGeneration.targets(79,5): Error : rzc discover exited with code -2147450730.
C:UsersVssAdministrator.nugetpackagesmicrosoft.aspnetcore.razor.design2.2.0uild
etstandard2.0Microsoft.AspNetCore.Razor.Design.CodeGeneration.targets(79,5): error : rzc discover exited with code -2147450730. [D:a1ssrcSenparc.Xncf.WeixinManagerSenparc.Xncf.WeixinManager.csproj]

尝试解决方案：

1. 项目文件设置添加：<RazorLangVersion>3.0</RazorLangVersion> ，无效，引发其他错误：MSB4044 未给任务“ComputeCssScope”的必需参数“TargetName”赋值。
2. 修改项目文件配置 Microsoft.NET.Sdk.Razor 为 Microsoft.NET.Sdk，集成后无法读取 Razor 页面
3. 项目添加引用 <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="3.1.1" />，无效

最终解决方案：

　　在 .csproj 文件中添加配置：

<AddRazorSupportForMvc>true</AddRazorSupportForMvc>