Program.cs

using System;
using Microsoft.Extensions.DependencyInjection;
using WorkflowCore.Interface;

namespace WorkflowCore.Sample17
{
    class Program
    {
        static void Main(string[] args)
        {
            var serviceProvider = ConfigureServices();

            //start the workflow host
            var host = serviceProvider.GetService<IWorkflowHost>();
            host.RegisterWorkflow<CompensatingWorkflow>();
            host.Start();

            Console.WriteLine("Starting workflow...");
            var workflowId = host.StartWorkflow("compensate-sample").Result;

            Console.ReadLine();
            host.Stop();
        }

        private static IServiceProvider ConfigureServices()
        {
            //setup dependency injection
            IServiceCollection services = new ServiceCollection();
            services.AddLogging();
            services.AddWorkflow();
            //services.AddWorkflow(x => x.UseMongoDB(@"mongodb://localhost:27017", "workflow"));
            //services.AddWorkflow(x => x.UseSqlServer(@"Server=.;Database=WorkflowCore;Trusted_Connection=True;", true, true));
            //services.AddWorkflow(x => x.UsePostgreSQL(@"Server=127.0.0.1;Port=5432;Database=workflow;User Id=postgres;", true, true));

            var serviceProvider = services.BuildServiceProvider();                        
            return serviceProvider;
        }
    }
}