在程序集中找不到上下文类型 - “ApplicationDbContext”类型不是从 DbContext 继承的

Question

When I am trying to update the database It is throwing the following error. Please note that update-database cmd used to work fine with me before.

No migrations configuration type was found in the assembly 'Tycoon'. (In Visual Studio you can use the Enable-Migrations command from Package Manager Console to add a migrations configuration).

I have tried Enable-Migrations but when I do that I get the following error.

No context type was found in the assembly 'Tycoon'.

And then I tried this

Enable-Migrations -ProjectName <YOUR_PROJECT_NAME> -ContextTypeName <YOUR_CONTEXT_NAME>

but got the following error.

The type 'ApplicationDbContext' does not inherit from DbContext. The DbMigrationsConfiguration.ContextType property must be set to a type that inherits from DbContext

I am building MVC application with Individual User accounts hence ApplicationDbContext class was created by default which is inherited from IdentityDbContext .

Please note that I was able to do migrations before but I am not sure why is it throwing errors now.

Answer 1

如果您的上下文文件的名称是 ApplicationDbContext，请尝试从基类 DbContext 派生它，如下所示：

public class ApplicationDbContext : DbContext