Asp.net核心EF选项.UseInMemoryDatabase System.TypeLoadException

Question

我在Asp.net Core中使用了EF,但是在下面的代码中出现了以下错误:

public class TodoContext : DbContext
{
    public TodoContext(DbContextOptions<TodoContext> options)
        : base(options)
    {

    }
    public DbSet<TodoItem> TodoItems { get; set; }

}

错误信息:

Microsoft.EntityFrameworkCore.dll中出现"System.TypeLoadException"类型的异常,但未在用户代码中处理

附加信息:无法从程序集"Microsoft.Extensions.DependencyInjection.Abstractions,Version = 1.1.0.0,Culture = neutral,PublicKeyToken = adb9793829ddae60"加载类型"Microsoft.Extensions.DependencyInjection.Extensions.ServiceCollectionExtensions".

这是我的Project.json

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.1",
      "type": "platform"
    },
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",

    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    //Dependence for MVC
    "Microsoft.AspNetCore.Mvc": "1.1.1",
    "Microsoft.AspNetCore.StaticFiles": "1.1.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.1.0",
    "Microsoft.Extensions.Configuration.Json": "1.1.0",
    //Dependence for EF
    "Microsoft.EntityFrameworkCore": "1.1.0",
    "Microsoft.EntityFrameworkCore.InMemory": "1.0.0-rc2-final"
    //Dependence for EF with SQL, this is avalible under VS 2017 RC
    //"Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
    //Entity Framework commands to maintain the database
    //"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview4-final"
  },

  "tools": {
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    //used for Razor pages which are compiled at runtime,and the compiler needs access to reference assemblies,
    //to make sure it compiles correctly
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config"
    ]
  },

  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

任何帮助,将不胜感激.
老师,
爱德华

Answer 1

尝试后,我将"1.0.0-rc2-final"更改为"1.1.0",我已经尝试了,但我发现有一个警告,"依赖冲突.CoreMVCWebAPI 1.0.0期望Microsoft.EntityFrameworkCore.InMemory> = 1.1.0但收到了1.0.0-rc2-final",手动安装此软件包后,而不是仅更改project.json,它现在可以正常工作.

Install-Package Microsoft.EntityFrameworkCore.InMemory