Enable Migrations doesn't work in ASP MVC 5

Question

I am trying to enable migrations in my project but I always get this error :

More than one context type was found in the assembly 'CarManagement'.
To enable migrations for 'CarManagement.Models.CarManagementContext', use Enable-Migrations

-ContextTypeName CarManagement.Models.CarManagementContext.

To enable migrations for 'CarManagement.Models.ApplicationDbContext', use

Enable-Migrations -ContextTypeName CarManagement.Models.ApplicationDbContext

and when I try to use only one context it also does not work and this error appears:

Enable-Migrations: A positional parameter cannot be found that accepts argument 'CarManagement.Models.CarManagementContext.'.
At line:1 char:1
Enable-Migrations -ContextTypeName eManager CarManagement.Models.CarM ...
  + CategoryInfo          : InvalidArgument: (:) [Enable-Migrations], ParameterBindingException
  + FullyQualifiedErrorId : PositionalParameterNotFound,Enable-Migrations

screenshot of PM to embed

Show your entire commandline. I think you have a rogue "eManager" somewhere in it. — CodeCaster
– CodeCaster, Commented Aug 3, 2017 at 11:28
PM> Enable-Migrations More than one context type was found in the assembly 'CarManagement'. To enable migrations for 'CarManagement.Models.CarManagementContext', use Enable-Migrations -ContextTypeName CarManagement.Models.CarManagementContext. To enable migrations for 'CarManagement.Models.ApplicationDbContext', use Enable-Migrations -ContextTypeName CarManagement.Models.ApplicationDbContext. PM> Enable-Migrations -ContextTypeName eManager CarManagement.Models.CarManagementContext. Enable-Migrations : A positional parameter cannot be found that accepts .......... — Anouar
– Anouar, Commented Aug 3, 2017 at 11:33
Yeah that doesn't really help. Anyway remove the "eManager" from that. — CodeCaster
– CodeCaster, Commented Aug 3, 2017 at 11:33
Sorry I will try to take a screenshot, maybe you it will be more clear, what do you mean by eManager ? How can i remove it ? — Anouar
– Anouar, Commented Aug 3, 2017 at 11:37
You are using the commandline Enable-Migrations -ContextTypeName eManager CarManagement.Models.CarManagementContext. Remove the "eManager" from that. I don't know where it comes from, but you have typed it. — CodeCaster
– CodeCaster, Commented Aug 3, 2017 at 11:46

Sibeesh Venu · Accepted Answer · 2019-06-11 09:20:39Z

10

I was getting the same error when I was trying to add migration with Add-Migration.

The issue was, as I have had more than one DBContext, I had to specify which one to use. We can either use the '-Context' parameter for PowerShell commands or the '--context' parameter for dotnet commands.

I was using --context in my command instead of -Context as I was running the command in Package Manager Console.

Add-Migration "AddNameColumnFavorites" --context LearnraumDatabaseCon

To fix the issue, I had to change the command as preceding.

Add-Migration -Context LearnraumDatabaseContext "AddNameColumnFavorites"

Hope it helps.

answered Jun 11, 2019 at 9:20

Sibeesh Venu

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Francinaldo Portela · Accepted Answer · 2017-08-03 11:51:37Z

1

you're typing a dot at the end of command. Try just:

Enable-Migrations -ContextTypeName CarManagement.Models.ApplicationDbContext

answered Aug 3, 2017 at 11:51

Francinaldo Portela

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