Blazor Scaffolding is broken due to regression

[coderdnewbie]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

1. I created a brand new Blazor App with Identity and Interactive Auto, using the Web App template.

2. I added the movie.cs file from Microsoft learning https://www.youtube.com/watch?v=ZN-CcfEY3Z8 and added scaffolding.

3. I did migrations and and update database using connected services

4. Fixed some scaffolding errors. Tried to go to localhost movies page. Got the following Exception:

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

The fix in program.cs, is to change builder.Services.AddDbContext<...>to builder.Services.AddDbContextFactory<...>and then it works as expected.

The issue is that the scaffolding pages are injecting:

@Inject IDbContextFactory<BlazorAppId.Data.ApplicationDbContext> DbFactory

but the program.cs is set as builder.Services.AddDbContext<...>

This is a regression as this used to work in .Net 8.0.

@Danoth, Please can you test https://www.youtube.com/watch?v=ZN-CcfEY3Z8 scaffolding again? I suspect it will not work with dotnet 9.0 and be a source of frustration to people trying to learn Blazor.

Expected Behavior

The regression is fixed so scaffolding works like .Net 8.0 where builder.Services.AddDbContextFactory<...> was used.

Steps To Reproduce

1. I created a brand new Blazor App with Identity and Interactive Auto, using the Web App template.

2. I added the movie.cs file from Microsoft learning https://www.youtube.com/watch?v=ZN-CcfEY3Z8 and added scaffolding.

3. I did migrations and and update database using connected services

4. Fixed some scaffolding errors. Tried to go to localhost movies page. Got the following Exception:

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

The fix in program.cs, is to change builder.Services.AddDbContext<...>to builder.Services.AddDbContextFactory<...>and then it works as expected.

Exceptions (if any)

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

.NET Version

.Net 9.0

Anything else?

No response