The term "Add-Migration" is not recognized

Question

Just install Microsoft.EntityFrameworkCore.Tools package from nuget:

Install-Package Microsoft.EntityFrameworkCore.Tools -Version 5.0.7

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

.NET CLI command:

dotnet add package Microsoft.EntityFrameworkCore.Tools

If the problem still persists, try restarting Visual Studio.

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

From Asp.Net Core 5.0 perspective

In the Migrations project Install the following:

• Add a reference to Data Access Layer (DAL) project (ex: if there is reference to Auth models)

In the Startup/Api project Install the following:

• Add a reference to your Migrations project.
• Add a reference to the Data Access Layer (DAL) project if you have one.

Ensure that you have added DbContext derived type to the services collection by using following line of code in Startup.ConfigureServices(IServiceCollection services):

services.AddDbContext<YourDbContext>(options => 
                  options.UseSqlServer(Configuration.GetConnectionString("YourDb"),
                                      x=>x.MigrationsAssembly("Your.Migrations")));

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.