Completed PaymentServiceResolver

modules/EasyAbp.EShop.Payments/src/EasyAbp.EShop.Payments.Domain/FreePaymentServiceProvider.cs → modules/EasyAbp.EShop.Payments/src/EasyAbp.EShop.Payments.Domain/Payments/FreePaymentServiceProvider.cs

 using System.Collections.Generic;
 using System.Threading.Tasks;
-using EasyAbp.EShop.Payments.Payments;
 using Microsoft.Extensions.DependencyInjection;
 using Volo.Abp.DependencyInjection;
 
-namespace EasyAbp.EShop.Payments
+namespace EasyAbp.EShop.Payments.Payments
 {
     [Dependency(ServiceLifetime.Transient, TryRegister = true)]
     public class FreePaymentServiceProvider : IPaymentServiceProvider

modules/EasyAbp.EShop.Payments/src/EasyAbp.EShop.Payments.Domain/Payments/IPaymentServiceResolver.cs

+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace EasyAbp.EShop.Payments.Payments
+{
+    public interface IPaymentServiceResolver
+    {
+        Task<bool> TryRegisterProviderAsync(string paymentMethod, Type providerType);
+        
+        Task<List<string>> GetPaymentMethodsAsync();
+
+        Task<Type> GetProviderTypeOrDefaultAsync(string paymentMethod);
+    }
+}
\ No newline at end of file

modules/EasyAbp.EShop.Payments/src/EasyAbp.EShop.Payments.Domain/Payments/PaymentServiceResolver.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
+using Volo.Abp.DependencyInjection;
+
+namespace EasyAbp.EShop.Payments.Payments
+{
+    public class PaymentServiceResolver : IPaymentServiceResolver, ISingletonDependency
+    {
+        protected readonly Dictionary<string, Type> Providers = new Dictionary<string, Type>();
+        
+        private readonly IServiceProvider _serviceProvider;
+
+        public PaymentServiceResolver(IServiceProvider serviceProvider)
+        {
+            _serviceProvider = serviceProvider;
+        }
+        
+        public virtual Task<bool> TryRegisterProviderAsync(string paymentMethod, Type providerType)
+        {
+            if (Providers.ContainsKey(paymentMethod))
+            {
+                return Task.FromResult(false);
+            }
+
+            using (var scope = _serviceProvider.CreateScope())
+            {
+                if (scope.ServiceProvider.GetService(providerType) == null)
+                {
+                    return Task.FromResult(false);
+                }
+            }
+
+            Providers.Add(paymentMethod, providerType);
+
+            return Task.FromResult(true);
+        }
+
+        public virtual Task<List<string>> GetPaymentMethodsAsync()
+        {
+            return Task.FromResult(Providers.Keys.ToList());
+        }
+
+        public virtual Task<Type> GetProviderTypeOrDefaultAsync(string paymentMethod)
+        {
+            return Task.FromResult(Providers.GetOrDefault(paymentMethod));
+        }
+    }
+}
\ No newline at end of file