泛型类 class<T> 语法简单测试

class Program
{
    static void Main(string[] args)
    {
        SaySomeThing<Hi> saySomeThing_Hi = new SaySomeThing<Hi>();
        Console.WriteLine(saySomeThing_Hi.GetObj().Content);

        SaySomeThing<Hello> saySomeThing_Hello = new SaySomeThing<Hello>();
        Hello hello = saySomeThing_Hello.GetObj();
        Console.WriteLine(hello.Title + "\r\n" + hello.Content);

        Console.ReadKey();
    }
}

class SaySomeThing<T> where T : Hi
{
    public T GetObj()
    {
        return Activator.CreateInstance<T>();
    }
}

class Hi
{
    public string Content { get; set; } = "窗前明月光，疑是地上霜。";
}

class Hello : Hi
{
    public string Title { get; set; } = "静夜思";
}

输出：

窗前明月光，疑是地上霜。
静夜思
窗前明月光，疑是地上霜。