Service Fabric Stateful Service with Asp.net Core Dependency Injection

Question

I use Asp.net core DI correctly in my Stateless service since is basically a normal WebApi application with controllers.

I can't figure out how to use Dependency Injection in Stateful Services. This is the default constructor for the Stateful service:

 public MyService(StatefulServiceContext context): base(context)
        {            
        }

And is called in Program.cs by

ServiceRuntime.RegisterServiceAsync("MyStatefulType",context => new MyService(context)).GetAwaiter().GetResult();

I would like to use something like this in the Stateful service:

  private readonly IHelpers _storageHelpers;
        public MyService(IHelpers storageHelpers)
        {
            _storageHelpers = storageHelpers;
        }

I already registered it in the Configuration section of the Stateful service, but if I try to use the code above I have the error:

StatefulService does not contain a constructor that takes 0 arguments

How to make it work?

score 2 · Accepted Answer · answered Dec 05 '16 at 08:20

The error is about the constructor of StatefulService, it requires at least a ServiceContext parameter. Your code only supplies the Storagehelper.

This would be the simplest way to make it work:

Service:

private readonly IHelpers _storageHelpers;
public MyService(StatefulServiceContext context, IHelpers storageHelpers) 
            : base(context)
{
            _storageHelpers = storageHelpers;
}

Program:

ServiceRuntime.RegisterServiceAsync("MyStatefulType",context => new MyService(context, new StorageHelper())).GetAwaiter().GetResult();

In 'program' you could also use the IOC container to get the Storage helper instance.

If he had an injection for IStorageHelper how would he go about getting the service instance to use in place of newing up a StorageHelper? — jKlaus, Mar 08 '17 at 18:47

Service Fabric Stateful Service with Asp.net Core Dependency Injection

1 Answers1