C#创建自定义泛型举例

用自定义泛型实现交换任意类型的两个变量。

class Program
    {
        static void Main(string[] args)
        {
            int a = 10, b = 90;
            Console.WriteLine("Before swap: {0}, {1}", a, b);
            Swap<int>(ref a, ref b);
            Console.WriteLine("After swap: {0}, {1}", a, b);
            Console.WriteLine("---------------------");

            string s1 = "Hello", s2 = "World";
            Console.WriteLine("Before swap: {0}  {1}", s1, s2);
            Swap<string>(ref s1, ref s2);
            Console.WriteLine("After swap: {0}  {1}", s1, s2);
            Console.WriteLine("---------------------");

            bool b1 = true, b2 = false;
            Console.WriteLine("Before swap: {0} , {1}", b1, b2);
            Swap<bool>(ref b1, ref b2);
            Console.WriteLine("After swap: {0}  , {1}", b1, b2);
            Console.WriteLine("---------------------");

            DisplayBaseClass<int>();
            DisplayBaseClass<string>();

            Console.ReadLine();
        }

        static void Swap<T>(ref T a, ref T b)
        {
            Console.WriteLine("You sent the Swap() method a {0}", typeof(T));
            T temp;
            temp = a;
            a = b;
            b = temp;
        }

        static void DisplayBaseClass<T>()
        {
            Console.WriteLine("Base class of {0} is : {1}", typeof(T), typeof(T).BaseType);
        }

注：引用自 《Por C# 2010 and the .NET 4 Platform》