C# 的 Func Action Predicate

void Demo_Func_Action( ) { Func<double, double, double> func = UseByFunc; Action<double, double> action = UseByAction; Predicate<double> predicate = UseByPredicate; Console.WriteLine("Func 返回：{0}", UseByFunc(10, 20)); Console.WriteLine("Predicate 返回：{0}", predicate(1)); } // 将会给Func用，由于Func是能够返回结果的
        public double UseByFunc(double x, double y) { return x + y; } //给Action用，由于Action是不返回的
        public void UseByAction(double x, double y) { Console.WriteLine("Action 内部结果:{0}",x-y); } public bool UseByPredicate(double a) { return true; }