How to fix 'Add-Migration : A parameter cannot be found that matches parameter name 'ContextTypeName' '

Question

I have two DbContext in my project, i am trying to run EF Add-Migration pointing to a specific DbContext, but i have being encountering the below error.

Add-Migration Initial -ContextTypeName System.BLL.Contexts.TenantDbContext


Add-Migration : A parameter cannot be found that matches parameter name 'ContextTypeName'.
At line:1 char:23
+ Add-Migration InitialCreation -ContextTypeName System.BLL.Contexts.TenantDbCo ...
+                       ~~~~~~~~~~~~~~~~
   + CategoryInfo          : InvalidArgument: (:) [Add-Migration], ParameterBindingException
   + FullyQualifiedErrorId : NamedParameterNotFound,Add-Migration

I also specified the Default Project from the drop-down.

Ground

No, i meant EF6. You can create a .net core project that will target .net framework, so that i can still make use of .net framework libraries. – Ground

Well, I'm only able to find a ContextTypeName parameter in the Enable-Migrations command. From where did you get that? – Pleasant

Like i said @Camilo, i am making use of two DbContext, so i have to specify which DbContext i am adding a migration to. – Ground

So you need the -Context parameter. – Neurologist

If you have your dbcontexts on different projects select your project from dropdown menu in the same powershell window, otherwise you have to include the -project too :) – Chiquita

Have you installed EntityFramework? Or, do you used EntityFrameworkCore? ContextTypeName is used in Enable-Migrations. Does Add-Migration work for the only one DbContext? Is there any specific reason you need EntityFramework instead of EntityFrameworkCore. – Dalmatian

Try to follow Make EF NuGet package / migrations and EF Tools work with new csproj format #231 – Dalmatian

Answer 1

You are using the parameters for EF Core, but attempting to run the command against EF 6. Context is not a valid parameter for Add-Migrations in EF6. According to multiple tutorials, the valid parameters are:

• Name
• Force
• ProjectName
• StartUpProjectName
• ConfigurationTypeName
• ConnectionStringName
• IgnoreChanges
• AppDomainBaseDirectory
• (CommonParameters: e.g., -Debug, -Verbose)

I've found a couple sites online that both document the parameters:

• https://coding.abel.nu/2012/03/ef-migrations-command-reference
• https://www.entityframeworktutorial.net/code-first/code-based-migration-in-code-first.aspx

Hastings