Question

我是实体框架核心的新手，我想在asp.net核心中使用实体框架核心。但是，当我添加迁移firstMigration时，它总是显示以下错误：

D：\ OwnLearnings \ EFCore \ AspNetCore_EFCore_001 \ src \ AspNetCore_EFCore_001 \ project.json

中的无效JSON文件

Project.json：

 {
   "dependencies": {
   "Microsoft.ApplicationInsights.AspNetCore": "1.0.0",
   "Microsoft.AspNetCore.Diagnostics": "1.0.0",
   "Microsoft.AspNetCore.Mvc": "1.0.1",
   "Microsoft.AspNetCore.Razor.Tools": {
     "version": "1.0.0-preview2-final",
     "type": "build"
   },
   "Microsoft.AspNetCore.Routing": "1.0.1",
   "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
   "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
   "Microsoft.AspNetCore.StaticFiles": "1.0.0",

   "Microsoft.EntityFrameworkCore.SqlServer": "1.0.0",
   "Microsoft.EntityFrameworkCore.Tools": {
     "version": "1.0.0-preview2-final",
     "type": "build"
    },


    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
    "Microsoft.NETCore.App": {
      "version": "1.0.1",
      "type": "platform"
    },
     "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0"
    },

  "tools": {
    "BundlerMinifier.Core": "2.0.238",
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final",
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"
  },

 "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%" ]
}
   }

我无法找到错误。我第一次在实体框架中遇到这种问题。提前谢谢。

Answer 1

您是否缺少对依赖项中的Entity框架包的引用：

"Microsoft.EntityFrameworkCore": "1.0.0"

此外，您还需要EF Core的导入来执行迁移和更新（命令行）。这需要在工具seciton中（工具引用也需要像你所说的那样依赖于它，不要删除它）

"dependencies": {
...   
},
"tools": {
    ..,
    "Microsoft.EntityFrameworkCore.Tools": {
      "version": "1.0.0-preview2-final",
      "Imports": [
        "portable-net45+win8+dnxcore50",
        "portable-net45+win8"
      ]
    }
}...

无效的JSON文件project.json

1 个答案: