Error : Cannot execute this command because Microsoft.EntityFrameworkCore.Design is not installed
c# entity-framework entity-framework-core
Question
I am trying to follow this tutorial: https://docs.efproject.net/en/latest/platforms/aspnetcore/existing-db.html
When I try to run :
Scaffold-DbContext "Server=myserver1;Database=mydb;Trusted_Connection=True;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models
I get this error :
Cannot execute this command because Microsoft.EntityFrameworkCore.Design is not installed. Install the version of that package that matches the installed version of Microsoft.EntityFrameworkCore and try again.
This is part of my project.json
"tools": {
"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
Any ideas?
Peter
Popular Answer
I had a similar issue I could not run add-migration from package manager console; it produced the same error. In my case lacking "type": "platform" for .netcore.app was the issue. I had to change
"Microsoft.NETCore.App": "1.1.0",
"Microsoft.EntityFrameworkCore.Design": "1.1.0",
"Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final"
to
"Microsoft.NETCore.App":
{
"version": "1.1.0",
"type": "platform"
},
"Microsoft.EntityFrameworkCore.Design": "1.1.0",
"Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final"
Then add to tools section
"tools": {
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.1.0-preview4-final",
"Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final"
},
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