C# 直接调用vs 委托vs动态调用vs动态类型vs反射,最佳性能测试

懒得解释,自己看代码

测试结果:

Direct call:00:00:00.0742191
Delegate Direct:00:00:00.0687487
Method Factory(IL):00:00:00.2015243
Direct IL:00:00:00.1980190
New Type:00:00:00.0860233
Reflection:00:00:02.4178550

using System.Reflection;
using System.Reflection.Emit;
using MoeCard.Emit;
using MoeCard.Reflection;

namespace MoeCard.TestConsole
{
	public class Program
	{
		public static void DoSomeThing()
		{

		}
		private static void Main(string[] args)
		{
			const int loops = 10000000;

			Stopwatch sw = new Stopwatch();

			//General delegation
			Action action1 = new Action(DoSomeThing);

			//Dynamic method
			MethodFactory<Action> method = MethodFactory.Create<Action>();//自己写的一个动态方法封装类,不必追究其原理
			method.CallMethod(action1).Return();
			Action action2 = method.Delegation;

			//Reflection
			MethodInfo doSomething = action1.Method;

			//Standard Dynamic method
			DynamicMethod method2 = new DynamicMethod("DoSomeThing", null, null);
			ILGenerator generator = method2.GetILGenerator();
			generator.Emit(OpCodes.Call, doSomething);
			generator.Emit(OpCodes.Ret);
			Action action3 = method2.CreateDelegate(typeof (Action)) as Action;

			//Type Builder

			AssemblyName assemblyName = Assembly.GetExecutingAssembly().GetName();//最后这玩意儿胜出
			AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave);
			ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("DynamicClassModule");
			TypeBuilder newTypeBuilder = moduleBuilder.DefineType("NewType");
			MethodBuilder methodBuilder = newTypeBuilder.DefineMethod("DoSomeThing", MethodAttributes.Public | MethodAttributes.Static);
			generator = methodBuilder.GetILGenerator();
			generator.Emit(OpCodes.Call, doSomething);
			generator.Emit(OpCodes.Ret);
			Type newType = newTypeBuilder.CreateType();
			Action action4 = Delegate.CreateDelegate(typeof (Action), newType.GetMethod("DoSomeThing")) as Action;

			assemblyBuilder.Save("DynamicAssembly.dll");

			sw.Restart();
			for (int i = loops; i != 0; i--)
			{
				DoSomeThing();
			}
			sw.Stop();
			Console.WriteLine("Direct call:" + sw.Elapsed);

			action1();
			sw.Restart();
			for (int i = loops; i != 0; i--)
			{
				action1();
			}
			sw.Stop();
			Console.WriteLine("Delegate Direct:" + sw.Elapsed);

			action2();
			sw.Restart();
			for (int i = loops; i != 0; i--)
			{
				action2();
			}
			sw.Stop();
			Console.WriteLine("Method Factory(IL):" + sw.Elapsed);

			action3();
			sw.Restart();
			for (int i = loops; i != 0; i--)
			{
				action3();
			}
			sw.Stop();
			Console.WriteLine("Direct IL:" + sw.Elapsed);

			action4();
			sw.Restart();
			for (int i = loops; i != 0; i--)
			{
				action4();
			}
			sw.Stop();
			Console.WriteLine("New Type:" + sw.Elapsed);

			sw.Restart();
			for (int i = loops; i != 0; i--)
			{
				doSomething.Invoke(null, null);
			}
			sw.Stop();
			Console.WriteLine("Reflection:" + sw.Elapsed);

			Console.ReadLine();
		}
	}
}