C#,反射和直接調用的效率差別

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反射時,由於編譯器要判斷許可權,身份等操作,所以比直接操作要慢

 

測試代碼:

            const int NUM = 1000000;            Stopwatch sw = new Stopwatch();            sw.Start();            for (int i = 0; i < NUM; i++)            {                ReflectTest rt = new ReflectTest();                rt.CountSomething();            }            sw.Stop();            Console.WriteLine(sw.ElapsedTicks);            sw.Reset();            sw.Start();            for (int i = 0; i < NUM; i++)            {                Assembly assembly = Assembly.GetExecutingAssembly();                Type t = assembly.GetType("ConsoleApplication1.ReflectTest");                ConstructorInfo constructorInfo = t.GetConstructors().OrderBy(c => c.GetParameters().Length).FirstOrDefault();                object obj = constructorInfo.Invoke(new object[constructorInfo.GetParameters().Length]);                //object obj = Activator.CreateInstance(t);                MethodInfo methodInfo = t.GetMethod("CountSomething");                methodInfo.Invoke(obj,new object[methodInfo.GetParameters().Length]);            }            sw.Stop();            Console.WriteLine(sw.ElapsedTicks);            Console.ReadKey();

 

 

結果:

 

 

反射用時是直接調用的2到3倍,所以非特殊需求,項目中就不要用反射吧。。。

C#,反射和直接調用的效率差別

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