Comments (4)
IEvangelist
commented on June 26, 2024
Show me what you're trying to do? If you could provide the code that you have, I might be able to help.
from docs.
zabpetrus
commented on June 26, 2024
Hello again! I am facing a runtime issue when trying to instantiate an
implementation for the 'API.Application.Interfaces.IContatoAppService'
interface. The specific error is as follows:
System.ArgumentException: 'Cannot instantiate implementation type
'API.Application.Interfaces.IContatoAppService' for service type
'API.Application.Interfaces.IContatoAppService'.' In the Builder I called:
builder.Services.AddScoped<IContatoAppService, IContatoAppService>() and I
tried other ways too: they all threw an exception.
I'm finding it difficult to solve this problem, as it's not clear where
exactly the error is (Sorry for the inconvenience, but I've got a project
in progress, and from what I know, dependency injection works with Scoped,
Singleton and others - but there is another way, which I couldn't identify,
but which generates the error ) It would be nice if you could provide more
detailed error messages or suggestions about what could be causing this
problem, as the error is pointed out in the builder (very generic). Thank
you in advance for your assistance!
Em qua., 29 de mai. de 2024 às 16:24, David Pine ***@***.***>
escreveu:
… Show me what you're trying to do? If you could provide the code that you
have, I might be able to help.
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IEvangelist
commented on June 26, 2024
Got it, thank you for the added context, that's very helpful! Ok, I see the issue. When you call:
builder.Services.AddScoped<IContatoAppService, IContatoAppService>();That's registering a scoped IContatoAppService type with a corresponding implementation of the interface. That's not going to work, since it cannot instantiate an interface, nothing can. Instead, you need to register (or map) the corresponding implementation.
Consider this:
builder.Services.AddScoped<IContatoAppService, DefaultContatoAppService>();In this example, the implemenation is the DefaultContatoAppService. It has to be defined somewhere:
public class DefaultContatoAppService : IContatoAppService
{
// TODO: Implement members.
}Does that make more sense now? Then for unit tests, you could mock the interface and use that.
from docs.
zabpetrus
commented on June 26, 2024
Thank you for responding.
I think you'd better see my project to get an idea. I put AddScoped on (and
tried the others) but it was the same thing as nothing. I don't know...
I've been trying for weeks. It might help me know where I'm going wrong!
https://github.com/zabpetrus/bazartemtudo/tree/main/BazarTemTudo
Actually... trying to make dependency injection work. Until now, I'm forced
to use new()...
Thanks!
Em qua., 29 de mai. de 2024 às 20:09, David Pine ***@***.***>
escreveu:
… Got it, thank you for the added context, that's very helpful! Ok, I see
the issue. When you call:
builder.Services.AddScoped<IContatoAppService, IContatoAppService>();
That's registering a scoped IContatoAppService type with a corresponding
implementation of the interface. That's not going to work, since it cannot
instantiate an interface, nothing can. Instead, you need to register (or
map) the corresponding implementation.
Consider this:
builder.Services.AddScoped<IContatoAppService, DefaultContatoAppService>();
In this example, the implemenation is the DefaultContatoAppService. It
has to be defined somewhere:
public class DefaultContatoAppService : IContatoAppService{
// TODO: Implement members.}
Does that make more sense now? Then for unit tests, you could mock the
interface and use that.
—
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