运行所选代码生成器时出现问题：“包恢复失败”

问题描述

几周前，我遇到了类似的脚手架错误问题并得到了解决方案。 我在尝试的是控制器>添加>新的脚手架项目>带有视图的MVC控制器，使用实体框架

链接：-

Error running selected code generator The database provider attempted to register an implementation of 'IRelationTypeMappingSource'

但问题是我再次面临这个问题。

我的 cproj 文件：

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

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Anycpu'">
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>

  <ItemGroup>
    <Compile Remove="Migrations\20200625063143_user_table_added_for_access_control.cs" />
    <Compile Remove="Migrations\20200625063143_user_table_added_for_access_control.Designer.cs" />
    <Compile Remove="Migrations\20200625070609_test.cs" />
    <Compile Remove="Migrations\20200625070609_test.Designer.cs" />
    <Compile Remove="Migrations\20200701100225_datatype_changed_to_long_of_assetno_in_both_table.cs" />
    <Compile Remove="Migrations\20200701100225_datatype_changed_to_long_of_assetno_in_both_table.Designer.cs" />
    <Compile Remove="Migrations\20200730114532_hasShiftingRequest_field_added_in_pc.cs" />
    <Compile Remove="Migrations\20200730114532_hasShiftingRequest_field_added_in_pc.Designer.cs" />
    <Compile Remove="Migrations\20200731033230_hasShiftingRequest_field_added_in_pc.cs" />
    <Compile Remove="Migrations\20200731033230_hasShiftingRequest_field_added_in_pc.Designer.cs" />
    <Compile Remove="Migrations\20200917095552_trial.cs" />
    <Compile Remove="Migrations\20200917095552_trial.Designer.cs" />
    <Compile Remove="Migrations\20201208042418_test.cs" />
    <Compile Remove="Migrations\20201208042418_test.Designer.cs" />
    <Compile Remove="Migrations\20201208054030_User_table_mapped_with_laptop_and_desktop.cs" />
    <Compile Remove="Migrations\20201208054030_User_table_mapped_with_laptop_and_desktop.Designer.cs" />
  </ItemGroup>

  <ItemGroup>
    <Content Remove="Views\AssetDataLaptops\Delete.cshtml" />
    <Content Remove="Views\AssetDataPcs\Delete.cshtml" />
    <Content Remove="Views\AssetShiftings\Delete.cshtml" />
    <Content Remove="Views\AssetShiftings\Details.cshtml" />
    <Content Remove="Views\AssetShiftings\Edit.cshtml" />
  </ItemGroup>

  <ItemGroup>
    <packagereference Include="bootstrap" Version="4.6.0" />
    <packagereference Include="Microsoft.EntityFrameworkCore" Version="3.1.4" />
    <packagereference Include="Microsoft.EntityFrameworkCore.Relational" Version="3.1.4" />
    <packagereference Include="Microsoft.EntityFrameworkCore.sqlite" Version="3.1.4" />    
    <packagereference Include="Microsoft.EntityFrameworkCore.sqlServer" Version="3.1.4" />
    <packagereference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.1.4">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </packagereference>
    <packagereference Include="Microsoft.VisualStudio.Web.CodeGeneration" Version="3.1.4" />
    <packagereference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.4" />
    <packagereference Include="System.DirectoryServices" Version="5.0.0" />
    <packagereference Include="System.DirectoryServices.AccountManagement" Version="5.0.0" />
    <packagereference Include="System.Management" Version="5.0.0" />
  </ItemGroup>

  <ItemGroup>
    <Folder Include="LocationReports\" />
  </ItemGroup>
</Project>

注意：-

我试过了....

-清理并重建

-更新所有包

-清除 nuget 缓存

-删除 .vs 文件夹并打开项目并清理/重建

-禁用离线 nuget 包源

-在nuget包源中添加“https://api.nuget.org/v3/index.json”

-将所有软件包降级到 3.1.4 并制作相同版本

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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