泛型约束（值类型和引用类型）

来源：互联网发布：ubuntu翻墙上google 编辑：程序博客网时间：2024/06/03 20:35

public class People{    public int Id { get; set; }    public string Name { get; set; }    public void SayHi()    {        Console.WriteLine("morning!");    }} public class GenericConstrint{   public static void Show<T>(T tValue) where T : People   {       tValue.SayHi();   }   /// <summary>   /// 值类型约束   /// </summary>   /// <typeparam name="T"></typeparam>   /// <param name="t"></param>   public static T GetValue<T>(T t) where T : struct   {            return default(T);   }   /// <summary>   /// 引用类型约束   /// </summary>   /// <typeparam name="T"></typeparam>   /// <param name="t"></param>   public static T GetRef<T>(T t) where T : class   {       return null;//引用类型，所以可以返回null   }}

使用代码：

GenericConstrint.GetValue<decimal>(100m);GenericConstrint.GetValue<int>(100);GenericConstrint.GetValue<float>(100f);GenericConstrint.GetRef<string>("1234");GenericConstrint.GetRef<People>(p);

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