IL

public static Func<int, int, int, int> CreateCalculateMethod()
        {
            DynamicMethod calculateDynamicMethod = new DynamicMethod("Calculate", IntegerType, new[] { IntegerType, IntegerType, IntegerType });

            ILGenerator iLGenerator = calculateDynamicMethod.GetILGenerator();
            iLGenerator.DeclareLocal(IntegerType);
            iLGenerator.Emit(OpCodes.Ldarg_0);
            iLGenerator.Emit(OpCodes.Ldarg_1);
            iLGenerator.Emit(OpCodes.Mul);
            iLGenerator.Emit(OpCodes.Stloc_0);
            iLGenerator.Emit(OpCodes.Ldloc_0);
            iLGenerator.Emit(OpCodes.Ldarg_2);
            iLGenerator.Emit(OpCodes.Sub);
            iLGenerator.Emit(OpCodes.Ret);

            return (Func<int, int, int, int>)calculateDynamicMethod.CreateDelegate(typeof(Func<int, int, int, int>));
        }

        public static int Calculate(int a, int b, int c)
        {
            int result = a * b;

            return result - c;
        }