Add DbContext Diagram fault in Blazor app

Hi,

I’m currently developing a Blazor Server-side app. I’ve encountered an issue with the tool for adding the DB Context diagram. I can survive without the diagram, but I figured I’d report the issue as anyone with a similar setup would likely face it too.

Essentially the crux of it is: my solution has two projects - one is the actual web app and the other is my datalibrary. When I attempt to add the DB context diagram, I am met with the following exception:

Parameter name: processResult at async Task EFCorePowerTools.Handlers.ModelAnalyzerHandler.GenerateAsync(string outputPath, Project project, GenerationType generationType) System.ArgumentException: Error: Microsoft.EntityFrameworkCore.Design.OperationException: Unable to create an object of type ‘FIS2_DbContext’. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728 —> System.InvalidOperationException: Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptions1[DataLibrary.Models.FIS2_FranklinContext_AutoGenerated]' while attempting to activate 'DataLibrary.Models.FIS2_DbContext'. at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.ConstructorMatcher.CreateInstance(IServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.CreateInstance(IServiceProvider provider, Type instanceType, Object[] parameters) at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetServiceOrCreateInstance(IServiceProvider provider, Type type) at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass21_4.<FindContextTypes>b__13() --- End of inner exception stack trace --- at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass21_4.<FindContextTypes>b__13() at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(Func1 factory) at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(String contextType) at Modelling.EfCoreModelBuilder.BuildResult(String outputPath, String startupOutputPath, Boolean generateDdl) in C:\Code\EFCorePowerTools\src\GUI\efpt30.core\EFCoreModelBuilder.cs:line 39 at Modelling.Program.Main(String[] args) in C:\Code\EFCorePowerTools\src\GUI\efpt30.core\Program.cs:line 57

Parameter name: processResult at async Task EFCorePowerTools.Handlers.ModelAnalyzerHandler.GenerateAsync(string outputPath, Project project, GenerationType generationType)

I think this is because FIS2_DbContext is a partial class that adds some bolt-ons to the auto-generated dbContext?

[Andy-Corrigan]

I’m slightly confused as to how that works, but it worked. I would’ve thought that the DbContext diagram would go in the project that has the DbContext, not the other one.

[ErikEJ]

As I said: try: right click the Blazor project