Register AspNetCore 2.1 Identity system with DbContext interface

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By default, when you call AddDbContext, you register a scoped DbContext instance. This means that anywhere within the handling of a single request, requesting said DbContext via DI will give you the same instance. With the double registration you have, the DI system will give you a different instance depending upon whether you ask for an IMyDbContext or a MyDbContext.

To instruct the DI system to give you the same instance for both types, use the following approach:

services.AddDbContext<MyDbContext>();
services.AddScoped<IMyDbContext>(sp => sp.GetRequiredService<MyDbContext>());

The first call registers MyDbContext and the second simply forwards requests for IMyDbContext to that same scoped MyDbContext instance.

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