这个冒号 (:) 是什么意思? [英] What does this colon (:) mean?

问题描述

this 关键字之前是一个冒号.任何人都可以解释冒号在这种情况下的含义吗?我不相信这是继承.

Before the this keyword is a colon. Can anyone explain what the colon means in this context? I don't believe this is inhertance.

谢谢

using System;

namespace LinkedListLibrary
{
    class ListNode
    {
        private object data;
        private ListNode next;

        public ListNode(object dataValue)
            : this(dataValue, null)
        {
        }

        public ListNode(object dataValue, ListNode nextNode)
        {
            data = dataValue;
            next = nextNode;
        }

        public ListNode Next
        {
            get
            {
                return next;
            }
            set
            {
                next = value;
            }
        }
        public object Data
        {
            get
            {
                return data;
            }
        }


    }
}

推荐答案

它(连同 this 关键字)指示构造函数在它自己执行之前调用同一类型中的另一个构造函数.

It (along with the this keyword) is instructing the constructor to call another constructor within the same type before it, itself executes.

因此:

public ListNode(object dataValue)
    : this(dataValue, null)
{
}

实际上变成:

public ListNode(object dataValue)
{
    data = dataValue;
    next = null;
}

请注意，您可以使用 base 而不是 this 来指示构造函数调用基类中的构造函数.

Note that you can use base instead of this to instruct the constructor to call a constructor in the base class.

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