CODEWITHSUNDEEP
c#visual-studio-2015asp.net-coreentity-framework-core
nam
nam

Reputation: 23749

ASP.NET Core EF Add-Migration command not working

Following this Microsoft Tutorial when I run the PM> Add-Migration MyFirstMigration command in VS2015 project created from the same tutorial I get the following error that I can't resolve:

More than one DbContext was found. Specify which one to use.
Use the '-Context' parameter for PowerShell commands and the '--context' parameter for dotnet commands.

Point to note

  1. I'm using the above tutorial with the exception that I'm using Individual User Account authentication instead of No Authentication used in the tutorial.
  2. I've latest release of ASP.NeT Core 1.0 and VS2015-Update 3 on windows 8.1
  3. This is a freshly created project. No other DbContext was manually installed

Upvotes: 56

Views: 89125

Answers (7)

Arshman Saleem
Arshman Saleem

Reputation: 205

[--context]

The DbContext class to use. Class name only or fully qualified with namespaces. If this option is omitted, EF Core will find the context class. If there are multiple context classes, this option is required.

Add-Migration MyMigration -context DataContextName

Upvotes: 1

Harichandra Sagar
Harichandra Sagar

Reputation: 21

Use below to commands:

PM> Add-Migration MyFirstMigration -Context YourDbContext

PM> update-database -Context YourDbContext

Upvotes: 1

nam
nam

Reputation: 23749

Running the following command (obtained from this article) and a response from @Maverik (from StackOverflow here) and a suggestion from @doctor above helped me resolved the issue. Thank you all for your help:

PM> Add-Migration MyFirstMigration -Context BloggingContext

Upvotes: 77

Mohsen.bakhtiyariha
Mohsen.bakhtiyariha

Reputation: 73

Add-Migration MyFirstMigration -Context DbContextName

It does work in my project.

Upvotes: 2

Diego Venâncio
Diego Venâncio

Reputation: 6007

If you need only update a identity schema existent, try it:

update-database -Context ApplicationDbContext

ApplicationDbContext = your identity context

Upvotes: 16

John
John

Reputation: 433

The error clearly explains to mention --context with db Context name if more than one DbContext. So try by mentioning your DbContext name.

dotnet ef migrations add Initial --context SampleDbContext

Hope this helps.

Upvotes: 19

Mohammad Al Safra
Mohammad Al Safra

Reputation: 114

that because you have two DbContext in your solution. First is default created when you creating project(ApplicationDbContext) and second your EF DbContext. Solution is described in error message just specify your EF DbContext

Upvotes: 4

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