Updated IEnumerable<Assembly> to params

Author: joel-jeremy

Src/Xer.Cqrs.Extensions.Microsoft.DependencyInjection/ServiceCollectionExtensions.cs

@@ -6,12 +6,7 @@ namespace Microsoft.Extensions.DependencyInjection
 {
     public static class ServiceCollectionExtensions
     {
-        public static IServiceCollection AddCqrs(this IServiceCollection serviceCollection, Assembly assembly)
-        {
-            return AddCqrs(serviceCollection, new[] { assembly });
-        }
-
-        public static IServiceCollection AddCqrs(this IServiceCollection serviceCollection, IEnumerable<Assembly> assemblies)
+        public static IServiceCollection AddCqrs(this IServiceCollection serviceCollection, params Assembly[] assemblies)
         {
             AddCqrsCore(serviceCollection)
                 .AddCommandHandlers(select => 
@@ -26,6 +21,11 @@ public static IServiceCollection AddCqrs(this IServiceCollection serviceCollecti
 
         public static ICqrsBuilder AddCqrsCore(this IServiceCollection serviceCollection)
         {
+            if (serviceCollection == null)
+            {
+                throw new System.ArgumentNullException(nameof(serviceCollection));
+            }
+
             return new CqrsBuilder(serviceCollection);
         }
     }