通用接口(C#编程指南) [英] Generic Interfaces (C# Programming Guide)

问题描述

你好

我正在浏览通用接口(C#编程指南)上的主题，该主题的链接为

I was going through the topic on Generic Interfaces (C# Programming Guide) whose link is

http://msdn.microsoft.com/en-us/library/kwtft8ak.aspx 我遇到了语句"

http://msdn.microsoft.com/en-us/library/kwtft8ak.aspx  I came across the statement "When an interface is specified as a constraint on a type parameter, only types that implement the interface can be used" . I tried to understand but could not. Please help. The code as below.

致谢

Manoj Gokhale

Manoj Gokhale

// Statement => When an interface is specified as a constraint 
// on a type parameter, only types that implement 
// the interface can be used
namespace ConsoleApplication1
{
    public interface I1<T>
    {
         void m1(int aa);
    }

    // interface is specified as a constraint 
    // on a type parameter
    public class genclass<T> where T : I1<T>
    {
        public void m1(int x){}
        public void m2(){}
    }
    // genclass1<T> does implement the interface I1<T>
    public class genclass1<T> : I1<T>
    {
        public void m1(int yy){}
        public void m3(){}
    }
    // class2<T> does not implement the interface I1<T>
    public class class2<T>
    {
        public void m4(){}
    }

    class TestGenericList
    {
        static void Main()
        {
            genclass1<int> xx = new genclass1<int>();
            // No compile error
            xx.m3();
            class2<int> yy = new class2<int>();
            yy.m4();
        }
        
    }
}

推荐答案

我认为此评论引用的是以下课程

I think the comment is refereing to the following class

   公共类Person:System.IComparable< Person>

     public class Person : System.IComparable<Person>

您只能在"Person"上对以上课程进行排序

The above class your can only sort on 'Person'

普通班使用此类

     公共类SortedList< T> :GenericList< T>其中T:System.IComparable< T>

       public class SortedList<T> : GenericList<T> where T : System.IComparable<T>

上面的类将对任何类型的System.IComparable< T>

The above class will sort on any type of System.IComparable<T>

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