Blazor Server App and IDbContextFactory not disposing

December 13, 2021

I have a blazor server application that needs to indirectly connect to a EF core DB context.

None of the blazor components will directly inject an instance of the dbcontext. I am using mediator which will handle all business operations.

The documentation that I have seen so far recommends using IDbContextFactory. I gave it a try but I am not seeing the DbContext created by the factory being disposed. The services that inject IDbContext are not disposed on page changes nor at any other time.

public class QueryHandler : IQueryHandler<Query, Entity>, IDisposable
{
    private readonly DbContext dbContext;

    public QueryHandler(IDbContextFactory factory)
    {
        dbContext = factory.CreateDbContext();
    }

    public Task Handle(Query query)
    {
       /// do whatever needs to be done.
    }
  
    public void Dispose()
    {
        dbContext.Dispose(); // <-- Dispose never gets called.
    }
}

Am I missing something?

>Solution :

The purpose of using a DbContextFactory is to have a DbContext per method.
Exactly because Blazor doesn’t offer useful Scopes to handle this.

public class QueryHandler : IQueryHandler<Query, Entity> //, IDisposable
{
    ...

    public QueryHandler(IDbContextFactory factory)
    {
        _factory = factory;
    }

    public Task Handle(Query query)
    {
       using dbContext = _factory.CreateDbContext();

       /// do whatever needs to be done.
    }
  
    //public void Dispose() { }

}