added binding syntax extension method for defining a named binding corresponding with a GetXYZ factory method

Author: ursenzler

src/Ninject.Extensions.Factory.Test/FactoryTests.cs

@@ -82,6 +82,25 @@ public void NamedBinding()
             weapon.Should().BeOfType<Sword>();
         }
 
+        [Fact]
+        public void NamedLikeFactoryMethod()
+        {
+            this.kernel.Bind<IWeapon>().To<Sword>().NamedLikeFactoryMethod((IWeaponFactory f) => f.GetSword());
+            this.kernel.Bind<IWeaponFactory>().ToFactory();
+
+            var weapon = this.kernel.Get<IWeaponFactory>().GetSword();
+
+            weapon.Should().BeOfType<Sword>();
+        }
+
+        [Fact]
+        public void NamedLikeFactoryMethodThrowsExceptionWhenNotAGetFactoryMethod()
+        {
+            Action action = () => this.kernel.Bind<IWeapon>().To<Sword>().NamedLikeFactoryMethod((IWeaponFactory f) => f.CreateWeapon());
+
+            action.ShouldThrow<ArgumentException>();
+        }
+
         [Fact]
         public void GetFallback()
         {
@@ -250,7 +269,7 @@ public void GenericFactoryMethodsAreSupported()
             handlers.Should().HaveCount(1);
             handlers.Single().Should().BeOfType<IntMessageHandler>();
         }
-        
+
         private class CustomInstanceProvider : StandardInstanceProvider
         {
             protected override string GetName(System.Reflection.MethodInfo methodInfo, object[] arguments)

src/Ninject.Extensions.Factory/BindToExtensions.cs

@@ -23,6 +23,8 @@
 namespace Ninject.Extensions.Factory
 {
     using System;
+    using System.Linq.Expressions;
+
     using Castle.DynamicProxy;
     using Ninject.Activation;
     using Ninject.Syntax;
@@ -86,6 +88,37 @@ public static IBindingWhenInNamedWithOrOnSyntax<object> ToFactory(this IBindingT
             return ToFactory(syntax, ctx => instanceProvider(), factoryType);
         }
 
+        /// <summary>
+        /// Defines a named binding with the name taken from the factory method used to create instances.
+        /// </summary>
+        /// <typeparam name="TInterface">The type of the interface.</typeparam>
+        /// <typeparam name="TFactory">¨The type of the factory.</typeparam>
+        /// <param name="syntax">The syntax.</param>
+        /// <param name="action">Expression defining the factory method used to get the binding name from.</param>
+        /// <returns>
+        /// The <see cref="IBindingWithOrOnSyntax{TInterface}"/> to configure more things for the binding.
+        /// </returns>
+        public static IBindingWithOrOnSyntax<TInterface> NamedLikeFactoryMethod<TInterface, TFactory>(this IBindingNamedSyntax<TInterface> syntax, Expression<Action<TFactory>> action)
+        {
+            var methodCallExpression = action.Body as MethodCallExpression;
+
+            if (methodCallExpression == null)
+            {
+                throw new ArgumentException("expected factory method instead of " + action, "action");
+            }
+
+            var methodName = methodCallExpression.Method.Name;
+
+            if (!methodName.StartsWith("Get"))
+            {
+                throw new ArgumentException("expected factory 'Get' method instead of " + action, "action");
+            }
+
+            var bindingName = methodName.Substring(3);
+
+            return syntax.Named(bindingName);
+        }
+
         /// <summary>
         /// Defines that the interface shall be bound to an automatically created factory proxy.
         /// </summary>