Question

我们有这个代码：

class student :IComparable , IComparable<student> 
{
    public string name = "";

    public override string ToString()
    {
        return name; 
    }

    #region IComparable Members

    public int CompareTo(object obj)
    {
        if (this.name.Equals(((student)obj).name ) )
            return 0 ; 
        else
            return -1 ; 
    }

    #endregion

    #region IComparable<student> Members

    public int CompareTo(student other)
    {
        if (this.name.Equals (other.name )) 
            return 0 ; 
        else
            return -1 ; 
    }

    #endregion
}

我在Main Like中创建了这个类的LinkedList：

LinkedList<student> list = new LinkedList<student>(); 
list.AddLast(new student { name="Farah"}); 
list.AddLast(new student { name="Noor"}); 
list.AddLast(new student { name="Reem"});

foreach (student s in list)
{
    Console.WriteLine(s);
}

它的印刷品：法拉努尔 REEM

但是当我尝试搜索任何没有找到它的元素时，例如：

Console.WriteLine(list.Contains(new student{ name="Noor"}));

这个打印假，虽然“学生”类实现“IComparable，IComparable”!!

我该怎么做才能工作？

Answer 1

问题，Contains不适用于IComparable接口。它使用Equals方法。所以覆盖它：

    public override bool Equals(object obj)
    {
        return this.CompareTo(((IComparable)obj)) == 0;
    }

Answer 2

为您的学生班实施Equals和GetHashCode。

Guidelines for Implementing Equals and the Equality Operator (==)

在LinkedList <t> </t>中搜索

2 个答案: