Generic 和 cast 的 性能比较

public class Obj { Object _t; Object _u; public void run(Object u, Object t) { _u = u; _t = t; } } public class GenericClass<T,U> { T _t; U _u; public void run(U u, T t) { _u = u; _t = t; } } class Program { static void Main(string[] args) { GenericClass<int,float> gc1 = new GenericClass<int,float>(); Obj obj = new Obj(); int a = 10; float b = 11.1f; long start = System.DateTime.Now.Ticks; for (int i = 0; i < 10000; i++) { gc1.run(b,a); } Console.WriteLine("Generic have run {0} tickets", System.DateTime.Now.Ticks - start); start = System.DateTime.Now.Ticks; for (int i = 0; i < 10000; i++) { obj.run(b, a); } Console.WriteLine("obj have run {0} tickets", System.DateTime.Now.Ticks - start); Console.ReadKey(); }}

 

两个类，都有同一个方法，run，功能是将传进来的参数赋值给成员变量。

一个利用generic,另外一个应用cast进行参数转换。

对两个类的实例分别调用run() 10000次，统计得出tickets 数如下:

Generic have run 8102536 tickets.

obj have run 0 tickets.