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Given following code: using System; using System.Reflection.Emit; using System.Diagnostics; using System.Reflection; namespace ConsoleApplication1 { class A { public int Do(int n) { return n; } } public delegate int DoDelegate(); class Program { public static void Main(string[] args) { A a = new A(); Stopwatch stopwatch = Stopwatch.StartNew(); int s = 0; for (int i = 0; i < 100000000; i++) { s += a.Do(i); } Console.WriteLine(stopwatch.ElapsedMilliseconds); Console.WriteLine(s); DynamicMethod dm = new DynamicMethod("Echo", typeof(int), new Type[] { typeof(int) }, true); ILGenerator il = dm.GetILGenerator(); il.Emit(OpCodes.Ldarg_0); il.Emit(OpCodes.Ret); DynamicMethod dm2 = new DynamicMethod("Test", typeof(int), new Type[0]); il = dm2.GetILGenerator(); Label loopStart = il.DefineLabel(); Label loopCond = il.DefineLabel(); il.DeclareLocal(typeof(int)); // i il.DeclareLocal(typeof(int)); // s // s = 0; il.Emit(OpCodes.Ldc_I4_0); il.Emit(OpCodes.Stloc_1); // i = 0; il.Emit(OpCodes.Ldc_I4_0); il.Emit(OpCodes.Stloc_0); il.Emit(OpCodes.Br_S, loopCond); il.MarkLabel(loopStart); // s += Echo(i); il.Emit(OpCodes.Ldloc_1); // Load s il.Emit(OpCodes.Ldloc_0); // Load i il.Emit(OpCodes.Call, dm); // Call echo method il.Emit(OpCodes.Add); il.Emit(OpCodes.Stloc_1); // i++ il.Emit(OpCodes.Ldloc_0); il.Emit(OpCodes.Ldc_I4_1); il.Emit(OpCodes.Add); il.Emit(OpCodes.Stloc_0); il.MarkLabel(loopCond);

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