When adding blazor scaffolding AddDBContext overwrites AddDBContextFactory and so cause app not to build

[coderdnewbie]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I created an interactive Server Blazor Web app with Identity.

The program.cs correctly had:

builder.Services.AddDbContextFactory(options =>
options.UseSqlServer(connectionString));

I then added the movie.cs example from Dan Roth using Blazor scaffolding. The program.cs got overwritten to

builder.Services.AddDbContext(options =>
options.UseSqlServer(connectionString));

This caused the following error:

An unhandled exception occurred while processing the request.

InvalidOperationException: Cannot provide a value for property 'DbFactory' on type 'BlazorAppMovieTest.Components.Pages.MoviePages.Index'. There is no registered service of type 'Microsoft.EntityFrameworkCore.IDbContextFactory`1[BlazorAppMovieTest.Data.ApplicationDbContext]'.

To fix this issue, I had to manually change AddDbContext back to AddDbContextFactory, and then it worked as expected.

Expected Behavior

Using Blazor CRUD scaffolding does not break the application

Steps To Reproduce

I created an interactive Server Blazor Web app with Identity.

The program.cs correctly had:

builder.Services.AddDbContextFactory(options =>
options.UseSqlServer(connectionString));

I then added the movie.cs example from Dan Roth using Blazor scaffolding. The program.cs got overwritten to

builder.Services.AddDbContext(options =>
options.UseSqlServer(connectionString));

This caused the following error:

An unhandled exception occurred while processing the request.

InvalidOperationException: Cannot provide a value for property 'DbFactory' on type 'BlazorAppMovieTest.Components.Pages.MoviePages.Index'. There is no registered service of type 'Microsoft.EntityFrameworkCore.IDbContextFactory`1[BlazorAppMovieTest.Data.ApplicationDbContext]'.

To fix this issue, I had to manually change AddDbContext back to AddDbContextFactory, and then it worked as expected.

Exceptions (if any)

An unhandled exception occurred while processing the request.

InvalidOperationException: Cannot provide a value for property 'DbFactory' on type 'BlazorAppMovieTest.Components.Pages.MoviePages.Index'. There is no registered service of type 'Microsoft.EntityFrameworkCore.IDbContextFactory`1[BlazorAppMovieTest.Data.ApplicationDbContext]'.

.NET Version

dotnet 9.0

Anything else?

No response

[coderdnewbie]

I will try to recreate this again, it is doing AddDbContext everywhere now

[juliomartinezcarrasco]

I had same issue and same solution already explained works.