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c# - 无法加载类型

问题描述

首先，我感谢您抽出宝贵的时间，我希望您能理解我的意思，即使英语如此糟糕：

无法从程序集“Microsoft.EntityFrameworkCore, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60”加载类型“Microsoft.EntityFrameworkCore.Infrastructure.IDbContextOptionsExtensionWithDebugInfo”

尝试重新安装所有软件包，手动放置引用，重新启动 PC，重新启动 VS2019 甚至启动新项目，但仍然再次出现错误。

我来过这里，但没有帮助。

services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(


Configuration.GetConnectionString("DefaultConnection")));

--.csproj

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

  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <UserSecretsId>aspnet-ZavrsniRad01-F04B6A7E-6450-4254-8092-F42843F4615A</UserSecretsId>
  </PropertyGroup>


  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="3.0.0-preview6.19307.2" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="3.0.0-preview6.19307.2" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.UI" Version="3.0.0-preview6.19307.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.0.0-preview.18572.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.0.0-preview6.19304.10" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="3.0.0-preview6.19304.6" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.0.0-preview6-19319-03" />
  </ItemGroup>

</Project>

标签： c#sqlasp.net-mvc

解决方案

显然我必须安装 EntityFrameworkCore.SqlServer preview6 来解决这个错误

Install-Package Microsoft.EntityFrameworkCore.SqlServer -Version 3.0.0-preview6.19304.10

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