Entry point not found in assembly 'Microsoft.EntityFrameworkCore.Design - dotnet.exe crashes

问题

Please look below for the data given in Package Manager Console. I can't do a Add-Migration. When I do the dotnet.exe crashes.

PM> Add-Migration 1
Unhandled Exception: System.MissingMethodException: Entry point not found in assembly 'Microsoft.EntityFrameworkCore.Design, Version=1.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
PM> dotnet --info
.NET Command Line Tools (1.0.0-preview2-003131)

Product Information:
 Version:            1.0.0-preview2-003131
 Commit SHA-1 hash:  635cf40e58

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.14393
 OS Platform: Windows
 RID:         win10-x64

回答1:

I solved this by removing the Design reference and only using the tools reference.

edit:

Over time gave me another error, from what I can tell the problem is that Microsoft updated their design package but not their tool package, so both don't work together, since if you follow their tutorial it should get the latest package you get an error by following it.

I solved it by forcing both packages to the 1.0.0-preview2-final. My updated project.json:

{
  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },
  "dependencies": {
    "Microsoft.AspNetCore.Session": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.1",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Logging": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.Extensions.Logging.Debug": "1.0.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
    "Microsoft.NETCore.App": "1.0.1",
    "System.Runtime": "4.1.0",
    "Newtonsoft.Json": "9.0.1",
    "DataAccess": "1.0.0-*",
    "Entities": "1.0.0-*",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.0.1",
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
    "Microsoft.EntityFrameworkCore.Design": "1.0.0-preview2-final"
  },
  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    }
  },
  "publishOptions": {
    "include": [
      "wwwroot",
      "appsettings.json",
      "web.config"
    ]
  },
  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },
  "runtimes": {
    "win10-x64": {},
    "win8-x64": {},
    "win7-x64": {}
  },
  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  },
  "tools": {
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  }
}

来源：https://stackoverflow.com/questions/40377865/entry-point-not-found-in-assembly-microsoft-entityframeworkcore-design-dotnet