In this article, we will create interface which will enable ASP.NET core Web API and Azure Service App fabric to communicate. In Getting Started with Azure Service Fabric we created Service Fabric and in adding Web API in Service Fabric we added ASP.Net core Web API.

Step 1: Right click on Solution and click Add -> New Project

Step 2: Select Class Library from installed Visual C# project if you are planning to target for Windows only.

Step 3: Right click on the added class library and select Manage Nuget Package. Search “Microsoft.ServiceFabric.Services” and install the package in class library project.

ServiceProxy needs IService which is available in Microsoft.ServiceFabric.Services nugget package.

Step 4: Create an interface and name it MyStatefulWebAPIInterface,  add Microsoft.ServiceFabric.Services.Remoting namespace and create an interface ICounter with method GetCountAsync.

using System.Threading.Tasks;

using Microsoft.ServiceFabric.Services.Remoting;

namespace MyStatefulWebAPIInterface

{

    class MyStatefulAndWebAPIInterface

    {

        public interface ICounter : IService

        {

            Task<long> GetCountAsync();

        }

    }

}

Step 5: Build MyStatefulWebAPIInterface and add reference of MyStatefulWebAPIInterface in MyStateFulService project.

Step 6: Now open MyStateFulService.cs file in MyStateFulService project.

Inherit ICounter interface in MyStateFulService and implement GetCountAsync method.

        public async Task<long> GetCountAsync()

        {

            var myDictionary =

              await this.StateManager.GetOrAddAsync<IReliableDictionary<string, long>>("myDictionary");

            using (var tx = this.StateManager.CreateTransaction())

            {

                var result = await myDictionary.TryGetValueAsync(tx, "Counter");

                return result.HasValue ? result.Value : 0;

            }

        }

Step 7: Add namespace of Microsoft.ServiceFabric.Services.Remoting.Runtime in MyStateFulService.cs file. We need to add this namespace to create RPC endpoint using CreateServiceRemotingListener method which enables client to invoke using service proxy.

Now modify the existing CreateServiceReplicaListeners with below code.

protected override IEnumerable<ServiceReplicaListener> CreateServiceReplicaListeners()

        {

            return new List<ServiceReplicaListener>()

            {

                new ServiceReplicaListener(

                    (context) =>

                        this.CreateServiceRemotingListener(context))

            };

        }

Step 8: Now Add the reference of interface project in the web application.

Step 9: Open ValuesController.cs in Controllers folder of MyWebAPIService and below namespace.

using MyStatefulWebAPIInterface;

using Microsoft.ServiceFabric.Services.Remoting.Client;

using Microsoft.ServiceFabric.Services.Client;

Step 10: Modify the Get method with below code.

        public async Task<IEnumerable<string>> Get()

        {

            ICounter counter =  ServiceProxy.Create<ICounter>(new Uri("fabric:/MyServiceApplication/MyStateFulService"), new ServicePartitionKey(0));

            long count = await counter.GetCountAsync();

            return new string[] { count.ToString() };

        }

Step 11: Open configuration manage from build menu; configuration will be like below image.

Click on the AnyCPU dropdown of MyStatefulWebAPIInterface and Select New. Make New Platform as X64 and Copy Settings from to AnyCPU. Make sure Create new solution platforms is unchecked.

The new configuration should be like below image.

Step 12: Now run the application, the application will open in browser where you will see the number which will change on every refresh.

This ends the article of creating interface to communicate between Service App Fabric and ASP.NET Web API application.