Entity Framework 核心不让我脚手架

Question

当我尝试使用 Entity Framework 核心 (CRUD) 添加 Razor 页面时，我不断收到此错误：

我该如何解决这样的问题？

这是我的 .csproj 文件

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

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <StartupObject>BCC_PurchasingAuth.Program</StartupObject>
    <ApplicationIcon></ApplicationIcon>
    <OutputType>Exe</OutputType>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Ardalis.GuardClauses" Version="3.0.1" />
    <PackageReference Include="AutoMapper.Collection.EntityFrameworkCore" Version="7.0.1" />
    <PackageReference Include="AutoMapper.Extensions.Microsoft.DependencyInjection" Version="8.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="5.0.2">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="5.0.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="5.0.2">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\BCC_PurchasingAuthDB\BCC_PurchasingAuthDB.csproj" />
  </ItemGroup>

</Project>

这些是我看过的资源：

https://docs.microsoft.com/en-us/aspnet/core/data/ef-rp/intro?view=aspnetcore-5.0&tabs=visual-studio

完全公开：我的解决方案包含两个项目。我使用 EF Core Power Tools 将我的数据库逆向工程为 class 库项目。我的页面在一个单独的应用程序项目中。

这是 class 库的 .csproj 文件：

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

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

  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="5.0.2">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="5.0.2" />
  </ItemGroup>

</Project>

让我知道还有哪些其他信息对此类错误有用，我会添加。

Answer 1

您需要将您的 class 库.csproj file 更改为关注

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

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

<ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.1.11">
        <PrivateAssets>all</PrivateAssets>
        <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.11" />
</ItemGroup>

还有你的 .csproj 文件：

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

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <StartupObject>BCC_PurchasingAuth.Program</StartupObject>
    <ApplicationIcon></ApplicationIcon>
    <OutputType>Exe</OutputType>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Ardalis.GuardClauses" Version="3.0.1" />
    <PackageReference Include="AutoMapper.Collection.EntityFrameworkCore" Version="7.0.1" />
    <PackageReference Include="AutoMapper.Extensions.Microsoft.DependencyInjection" Version="8.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="3.1.11" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.11" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.1.11">
        <PrivateAssets>all</PrivateAssets>
        <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.4" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\BCC_PurchasingAuthDB\BCC_PurchasingAuthDB.csproj" />
  </ItemGroup>

</Project>

Entity Framework 核心不让我脚手架

Entity Framework Core won't let me scaffold

c#

entity-framework-core

asp.net-core

razor-pages

asp.net-core-3.1