Move IContainer extension methods

src/Umbraco.Core/Composing/ContainerExtensions.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Collections.Generic;
+
+namespace Umbraco.Core.Composing
+{
+    /// <summary>
+    /// Provides extension methods to the <see cref="IContainer"/> class.
+    /// </summary>
+    public static class ContainerExtensions
+    {
+        /// <summary>
+        /// Gets an instance.
+        /// </summary>
+        /// <typeparam name="T">The type of the instance.</typeparam>
+        /// <param name="container">The container.</param>
+        /// <returns>An instance of the specified type.</returns>
+        /// <remarks>Throws an exception if the container failed to get an instance of the specified type.</remarks>
+        public static T GetInstance<T>(this IContainer container)
+            => (T) container.GetInstance(typeof(T));
+
+        /// <summary>
+        /// Gets an instance with arguments.
+        /// </summary>
+        /// <typeparam name="T">The type of the instance.</typeparam>
+        /// <param name="container">The container.</param>
+        /// <param name="args">Arguments.</param>
+        /// <returns>An instance of the specified type.</returns>
+        /// <remarks>
+        /// <para>Throws an exception if the container failed to get an instance of the specified type.</para>
+        /// <para>The arguments are used as dependencies by the container.</para>
+        /// </remarks>
+        public static T GetInstance<T>(this IContainer container, object[] args)
+            => (T) container.GetInstance(typeof(T), args);
+
+        /// <summary>
+        /// Tries to get an instance.
+        /// </summary>
+        /// <typeparam name="T">The type of the instance.</typeparam>
+        /// <returns>An instance of the specified type, or null.</returns>
+        /// <remarks>Returns null if the container does not know how to get an instance
+        /// of the specified type. Throws an exception if the container does know how
+        /// to get an instance of the specified type, but failed to do so.</remarks>
+        public static T TryGetInstance<T>(this IContainer container)
+            => (T) container.TryGetInstance(typeof(T));
+
+        // fixme - document all these
+
+        public static IEnumerable<Registration> GetRegistered<TService>(this IContainer container)
+            => container.GetRegistered(typeof(TService));
+
+        public static void Register<TService, TImplementing>(this IContainer container, Lifetime lifetime = Lifetime.Transient)
+            => container.Register(typeof(TService), typeof(TImplementing), lifetime);
+
+        public static void Register<TService, TImplementing>(this IContainer container, string name, Lifetime lifetime = Lifetime.Transient)
+            => container.Register(typeof(TService), typeof(TImplementing), name, lifetime);
+
+        public static void Register<TService>(this IContainer container, Lifetime lifetime = Lifetime.Transient)
+            => container.Register(typeof(TService), lifetime);
+
+        public static void RegisterSingleton<TService>(this IContainer container)
+            => container.Register(typeof(TService), Lifetime.Singleton);
+
+        public static void RegisterSingleton<TService, TImplementing>(this IContainer container)
+            => container.Register(typeof(TService), typeof(TImplementing), Lifetime.Singleton);
+
+        public static void RegisterSingleton<TService>(this IContainer container, Func<IContainer, TService> factory)
+            => container.Register(factory, Lifetime.Singleton);
+
+        public static void RegisterInstance<TService>(this IContainer container, TService instance)
+            => container.RegisterInstance(typeof(TService), instance);
+
+        public static void RegisterAuto<TServiceBase>(this IContainer container)
+            => container.RegisterAuto(typeof(TServiceBase));
+    }
+}