Fix:Unable to create an object of type DbContext For the different patterns supported at design time

Unable to create an object of type DbContext For the different patterns supported at design time

[victoriabarros]

in Program.cs add "var app = builder.Build();" this line after builder.Services.AddDbContex

[logeshb]

cannot create a dbset because this type is not included in the model context..
How to fix this?

[muhamedkarajic]

There might be an issue for the user that they have the configuration using the DI, also reinsure you have or (Tools will also add Design so both is fine) in your main project where the configuration is or.

In that case they just need to either:
1. Provide a default constructor to the DerivedDbContext.
2. Specifing the assembly reference inside the DI configuration using .MigrationsAssembly, like:
=> optionsBuilder

.UseSqlServer(_configuration.GetConnectionString("MulticheckDatabase"), options=>options.MigrationsAssembly("DB_CONTEXT_PROJECT_NAME"))

[codefactory]

If you are getting this error set your startup project to the API or WebApp project in my case my startup project name is API


if you are using the CLI is the startup flag -s ProjectName

[DiscipleW]

Put the below flags to point your persistence project and Startup project while in the root folder and it should work
dotnet ef migrations add InitialMigration -p Persistence/ -s API/

[eswar]

not working ..already I am using the same thing AddTransient

[edimilsonjosedasilvajunior]

This solution doesn't work for me, but thanks for sharing your knowledge.

[maroinecherif]

can u create a video 'invoice management system' with asp .net core 3.1

[ioniernestina]

But I need to use Scoped dbContext pool

[aplb]

Didn't work in console application