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  2. The term “Add-Migration” is not recognized

The term “Add-Migration” is not recognized

由 那年仲夏 提交于 2019-12-03 09:19:28

Try the following steps:

1) Open project.json file and Remove all Microsoft.EntityFrameworkCore.Tools references from dependencies and tools sections.

2) Close Package Manager Console (PMC) and restart Visual Studio

3) Add under dependencies section:

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

4) Add under tools section

"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"

5) Restart again Visual Studio 2015

6) Open the PMC and type

Add-Migration $Your_First_Migration_Name$

This happen because the PMC recognize the tools when Visual Studio is starting.

Ensure Microsoft.EntityFrameworkCore.Tools is referenced in the dependencies section of your project.json. NuGet won't load the Package Manager Commands from the tools section. (See NuGet/Home#3023)

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

same issue...resolved by dong the following

1.) close pm manager 2.) close Visual Studio 3.) Open Visual Studio 4.) Open pm manager

seems the trick is to close PM Manager before closing VS

Nasir Jafarzadeh

It's so simple.

Just install Microsoft.EntityFrameworkCore.Tools package from nuget:

Install-Package Microsoft.EntityFrameworkCore.Tools -Version 2.1.3

You can also use this link to install the latest version: Nuget package link

I just had this problem too. I closed and opened VS2015 and it "fixed" the issue...

You have to know what is your Entity-Framework version. Also after that you have to check project.json and control these sections:

In Dependencies

check:

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

This section:

"version": "1.0.0-preview2-final",

is related with version of your Entity-Framework and you have to change this with that.

After that the second section of the proj.json is here, In the Tools section of JSON you have:

"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",

Also this part of code is related with your Entity-Framework and last part of code in Dependencies section.

Note: After do this issues you should to close CMD and restart visual studio.

I had this problem in Visual Studio 2013. I reinstalled NuGet Package Manager:

https://marketplace.visualstudio.com/items?itemName=NuGetTeam.NuGetPackageManagerforVisualStudio2013

​What I had to do...

1) Tools -> Nuget Package Manger -> Package Manager Settings

2) General Tab

3) Clear All NuGet Cache(s)

4) Restart Visual Studio

Just try init Microsoft.EntityFrameworkCore.Tools. In PM execute 

C:\Users\<username>\.nuget\packages\Microsoft.EntityFrameworkCore.Tools\1.0.0-preview2-final\tools\init.ps1.

It helped me with the same problem. A version of the tools might be different. It`s depended of what you use in your project.

I had the same problem and found that it was a Visual Studio versioning problem in the Solution file.

I was targeting:

VisualStudioVersion = 14.0.25123.0

But I needed to target:

VisualStudioVersion = 14.0.25420.1

After making that change directly to the Solution file, EF Core cmdlets started working in the Package Manager Console.

I ran into the same issue. Most of my projects had the same thing in tools.

"tools": {
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"
}

This worked fine on all but one project. I changed the entry in tools to

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

And then ran dotnet restore. After the restore completed, Add-Migration worked normally.

I had this problem and none of the previous solutions helped me. My problem was actually due to an outdated version of powershell on my Windows 7 machine - once I updated to powershell 5 it started working.

These are the steps I followed and it solved the problem

1)Upgraded my Power shell from version 2 to 3

2)Closed the PM Console

3)Restarted Visual Studio

4)Ran the below command in PM Console dotnet restore

5)Add-Migration InitialMigration

It worked !!!

Go to package manager console(in visual studio) and execute below command

C:\Users\<YOUR_USER>\.nuget\packages\Microsoft.EntityFrameworkCore.Tools\<YOUR_INSTALLED_VERSION>\tools\init.ps1

I think the answer needs updating in 2017, as MS have made some (breaking) changes that is detailed here.

https://github.com/aspnet/EntityFramework/issues/7053

To summarise, you will now need a reference to EntityFrameWorkCore.Tools.DotNet in the Tools Section as below

"Microsoft.EntityFrameworkCore.Tools.DotNet": "1.0.0"

I have also posted a working project.json file below in case some one runs in problems.

{
  "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",
    "Microsoft.AspNetCore.Razor.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.1",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.0.1",
    "Microsoft.Extensions.Configuration.Json": "1.0.1",
    "Microsoft.EntityFrameworkCore.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    }
  },

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

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

  "buildOptions": {
    "emitEntryPoint": true,
    "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%" ]
  }
}

I tried doing all the above and no luck. I downloaded the latest .net core 2.0 package and ran the commands again and it worked.

标签
visual-studio-2015
asp.net-core
entity-framework-core
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