当前运行时目标框架与项目不兼容

Question

在将Entity Framework 7添加到我的Asp.Net 5项目后，我正在尝试执行初始迁移。我正在遵循此文档。

在我的project.json中，我指定了：

  "commands": {
    "web": "Microsoft.AspNet.Server.Kestrel",
    "ef": "EntityFramework.Commands"
  },
  "frameworks": {
    "dnxcore50": { }
  }

我正试图通过命令提示符在项目目录中执行以下命令：

dnx ef migrations add MyFirstMigration

但我得到以下错误：

System.InvalidOperationException：当前运行时目标框架与ProjectName不兼容。当前运行时目标framework:'DNX，Version=v4.5.1（dnx451）请确保运行时匹配project.json.中指定的框架

奇怪的是，我的project.json肯定是针对dnxcore50的。我还检查了global.json:

{
  "projects": [ "src", "test" ],
  "sdk": {
    "version": "1.0.0-beta8",
    "architecture": "x86",
    "runtime": "coreclr"
  }
}

和我的包依赖所有参考beta8:

  "dependencies": {
    "EntityFramework.Commands": "7.0.0-beta8",
    "EntityFramework.Core": "7.0.0-beta8",
    "EntityFramework.SqlServer": "7.0.0-beta8",
    "Hl7.Fhir.DSTU2": "0.90.2",
    "Microsoft.AspNet.Authentication.Cookies": "1.0.0-beta8",
    "Microsoft.AspNet.Authentication.OpenIdConnect": "1.0.0-beta8",
    "Microsoft.AspNet.Diagnostics": "1.0.0-beta8",
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-beta8",
    "Microsoft.AspNet.Mvc": "6.0.0-beta8",
    "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-beta8",
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-beta8",
    "Microsoft.AspNet.StaticFiles": "1.0.0-beta8",
    "Microsoft.AspNet.Tooling.Razor": "1.0.0-beta8",
    "Microsoft.Dnx.Runtime": "1.0.0-beta8",
    "Microsoft.Framework.Configuration.Json": "1.0.0-beta8",
    "Microsoft.Framework.Configuration.UserSecrets": "1.0.0-beta8",
    "Microsoft.Framework.Logging": "1.0.0-beta8",
    "Microsoft.Framework.Logging.Console": "1.0.0-beta8",
    "Microsoft.Framework.Logging.Debug": "1.0.0-beta8",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-beta8"
  }

Answer 1

您需要将dnx451添加到项目支持的框架中，或者切换到.NET Core版本。

  "frameworks": {
    "dnxcore50": { },
    "dnx451": { }
  }

或者运行：

dnvm install latest -r coreclr

或

dnvm use default -r coreclr