C#类自动增量ID

本文介绍了C#类自动增量ID的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在用C#创建一个称为机器人"的类，每个机器人都需要一个唯一的ID属性，该属性为其赋予一个标识.

I am creating a class in C# called "Robot", and each robot requires a unique ID property which gives themselves an identity.

是否可以为每个新的类对象创建自动增量ID?因此，如果我创建了5个新机器人，则它们的ID分别为1、2、3、4、5.如果我随后销毁机器人2并在以后创建一个新机器人，则其ID为2.如果我添加一个第六，它的ID为6，依此类推.

Is there any way of creating an auto incremental ID for each new class object? So, If i created 5 new robots, their IDs respectively will be 1, 2, 3, 4, 5. If I then destroy robot 2 and create a new robot later, it will have the ID of 2. And if I add a 6th it will have the ID of 6 and so on..

谢谢.

推荐答案

这将达到目的，并以一种不错的线程安全方式进行操作.当然，这取决于您自己处置机器人，等等.显然，对于许多机器人来说，这样做效率不高，但是有很多方法可以解决该问题.

This will do the trick, and operate in a nice threadsafe way. Of course it is up to you to dispose the robots yourself, etc. Obviously it won't be efficient for a large number of robots, but there are tons of ways to deal with that.

public class Robot : IDisposable { private static List<bool> UsedCounter = new List<bool>(); private static object Lock = new object(); public int ID { get; private set; } public Robot() { lock (Lock) { int nextIndex = GetAvailableIndex(); if (nextIndex == -1) { nextIndex = UsedCounter.Count; UsedCounter.Add(true); } ID = nextIndex; } } public void Dispose() { lock (Lock) { UsedCounter[ID] = false; } } private int GetAvailableIndex() { for (int i = 0; i < UsedCounter.Count; i++) { if (UsedCounter[i] == false) { return i; } } // Nothing available. return -1; }

还有一些很好的测试代码.

And some test code for good measure.

[Test] public void CanUseRobots() { Robot robot1 = new Robot(); Robot robot2 = new Robot(); Robot robot3 = new Robot(); Assert.AreEqual(0, robot1.ID); Assert.AreEqual(1, robot2.ID); Assert.AreEqual(2, robot3.ID); int expected = robot2.ID; robot2.Dispose(); Robot robot4 = new Robot(); Assert.AreEqual(expected, robot4.ID); }