C# 在程序集'中找不到入口点；Microsoft.EntityFrameworkCore.Design，版本=1.1.0.0

我在这篇文章中遇到了一个类似的问题：

我创建了一个Asp.Net核心MVC应用程序，project.json如下所示：

{

  "dependencies": {
    "Microsoft.AspNetCore.Razor.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.EntityFrameworkCore.Tools": {
      "version": "1.1.0-preview4-final",
      "type": "build"
    },

    "Microsoft.EntityFrameworkCore.Design": {
      "version": "1.1.0",
      "type": "build"
    },

    "Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.VisualStudio.Web.CodeGenerators.Mvc": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "RealEstateCoreApplication.DB": "1.0.0-*",
    "Microsoft.AspNetCore.Authentication.Cookies": "1.1.0",
    "Microsoft.AspNetCore.Diagnostics": "1.1.0",
    "Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.1.0",
    "Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.1.0",
    "Microsoft.AspNetCore.Mvc": "1.1.1",
    "Microsoft.AspNetCore.Routing": "1.1.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.AspNetCore.StaticFiles": "1.1.0",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
    "Microsoft.EntityFrameworkCore.SqlServer.Design": "1.1.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.0",
    "Microsoft.Extensions.Configuration.Json": "1.1.0",
    "Microsoft.Extensions.Configuration.UserSecrets": "1.1.0",
    "Microsoft.Extensions.Logging": "1.1.0",
    "Microsoft.Extensions.Logging.Console": "1.1.0",
    "Microsoft.Extensions.Logging.Debug": "1.1.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0",
    "Microsoft.NETCore.App": "1.1.0",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.1.0",
    "BundlerMinifier.Core": "2.3.327"
  },

  "tools": {
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final",
    "Microsoft.EntityFrameworkCore.Tools": {
      "version": "1.0.0-preview2-final",
      "imports": [
        "portable-net45+win8+dnxcore50",
        "portable-net45+win8"
      ]
    },

    "Microsoft.Extensions.SecretManager.Tools": "1.0.0-preview2-final",
    "Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
      "version": "1.0.0-preview2-final",
      "imports": [
        "portable-net45+win8"
      ]
    }
  },

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

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

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

  "publishOptions": {
    "include": [
      "wwwroot",
      "**/*.cshtml",
      "appsettings.json",
      "web.config"
    ]
  },

  "scripts": {
    "prepublish": [ "bower install", "dotnet bundle" ],
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  },
  "runtimes": {
    "win7-x64": {}
  }
}

---

我尝试了很多方法，但无法将命令：“dotnet ef database update-c IdentityDb”设置为在命令窗口中工作（IdentityDb替换默认的应用程序上下文）。只是不停地说：在程序集“Microsoft.EntityFrameworkCore.Design，Version=1.1.0.0”中找不到入口点。我遇到了相同的问题，经过几次测试，我找到了解决方案。 这里是我的project.json

"dependencies": {
"Microsoft.AspNetCore.Authentication.Cookies": "1.1.1",
"Microsoft.AspNetCore.Diagnostics": "1.1.1",
"Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.1.1",
"Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.1.1",
"Microsoft.AspNetCore.Mvc": "1.1.2",
"Microsoft.AspNetCore.Routing": "1.1.1",
"Microsoft.AspNetCore.Server.IISIntegration": "1.1.1",
"Microsoft.AspNetCore.Server.Kestrel": "1.1.1",
"Microsoft.AspNetCore.StaticFiles": "1.1.1",
"Microsoft.EntityFrameworkCore.SqlServer": "1.1.1",
"Microsoft.EntityFrameworkCore.SqlServer.Design": "1.1.1",
"Microsoft.EntityFrameworkCore.Design": "1.1.1",
"Microsoft.EntityFrameworkCore.Tools.DotNet": "1.1.0-preview4-final",
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.1",
"Microsoft.Extensions.Configuration.Json": "1.1.1",
"Microsoft.Extensions.Configuration.UserSecrets": "1.1.1",
"Microsoft.Extensions.Logging": "1.1.1",
"Microsoft.Extensions.Logging.Console": "1.1.1",
"Microsoft.Extensions.Logging.Debug": "1.1.1",
"Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.1",
"Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.1.0",
"Microsoft.VisualStudio.Web.CodeGeneration.Tools": "1.1.0-preview4-final",
"Microsoft.VisualStudio.Web.CodeGenerators.Mvc": "1.1.0",
"Microsoft.NETCore.App": "1.1.1"},

"buildOptions": {
"emitEntryPoint": true,
"preserveCompilationContext": true},

"frameworks": {
"netcoreapp1.1": {
  "imports": [
    "dotnet5.6",
    "portable-net45+win8"]}},

"tools": {
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final",
"Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
  "version": "1.1.0-preview4-final",
  "imports": [
    "portable-net45+win8"
  ]
},
"Microsoft.EntityFrameworkCore.Tools.DotNet": "1.1.0-preview4-final"}

要解决此问题，您应该升级到.NET Core 1.1

在“依赖项”中将Microsoft.NETCore.App更改为1.1.1，在“框架”部分，netcoreapp1.0参考将需要更改为netcoreapp1.1

重要提示：工具包的名称已从Microsoft.EntityFrameworkCore.tools更改为Microsoft.EntityFrameworkCore.tools.Dotnet

请同时参阅此

我还将Nuget升级到了3.5版

我希望，这会对你有所帮助。

---

您好

您是否碰巧找到了解决此问题的方法？当我试着运行这个程序时，确实发生了这样的事情。