c# 多线程 双色球

学习记录。仅供参考。

知识点：

1. 多线程
2. Lock

环境：

1. Visual Studio 2017

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    public partial class Form1 : Form
    {
        private static readonly ConcurrentDictionary<int, bool> SourceDic = new ConcurrentDictionary<int, bool>(); //存放数字的字典 标记为True 表示已占用，不能再使用我

        private static readonly ConcurrentDictionary<int, int> ResultDic = new ConcurrentDictionary<int, int>(); //存放UI页面上次存放的数字 通过Label的Id 保存最后的结果值

        private static readonly Random Random = new Random(); //随机数

        private CancellationTokenSource _cts = new CancellationTokenSource(); //取消信号源

        private static readonly object LockObj = new object();//锁

        static Form1()//静态构造
        {
            foreach (var i in Enumerable.Range(1, 33))
            {
                SourceDic.TryAdd(i, false);
            }

            foreach (var i in Enumerable.Range(1, 7))
            {
                ResultDic.TryAdd(i, i); //1,2,3,4,5,6,7
            }
        }

        public Form1()//构造函数
        {
            InitializeComponent();
        }

        //开始按钮
        private void btnStart_Click(object sender, EventArgs e)
        {
            if (_cts.IsCancellationRequested)
            {
                _cts = new CancellationTokenSource(); //重新生成cts
            }

            btnStart.Enabled = false;
            btnEnd.Enabled = true;

            foreach (var i in Enumerable.Range(1, 7))
            {
                Task.Factory.StartNew(o =>
                {
                    var controlId = Convert.ToInt32(o);
                    while (!_cts.IsCancellationRequested)
                    {
                        if (controlId == 7)//==7表示是绿球
                        {
                            ResultDic.TryGetValue(7, out var value);
                            ResultDic.TryUpdate(7, Random.Next(1, 17), value);
                        }
                        else
                        {
                            var oldValueKey = ResultDic.GetOrAdd(controlId, controlId);
                            var newValueKey = GetNonDuplicate(oldValueKey); 
                            ResultDic.TryUpdate(controlId, newValueKey, oldValueKey);
                        }

                        UpdateLabel(controlId);
                        Thread.Sleep(Random.Next(1, 5));//1-5毫秒随机停顿
                    }
                }, i);
            }
        }

        //结束按钮
        private void btnEnd_Click(object sender, EventArgs e)
        {
            btnStart.Enabled = true;
            btnEnd.Enabled = false;

            _cts.Cancel();
        }

        //获取不重复数字
        private static int GetNonDuplicate(int oldKey)
        {
            int key;
            lock (LockObj)
            {
                do
                {
                    key = Random.Next(1, 34);
                } while (oldKey == key || SourceDic.GetOrAdd(key, true)); //true表示被占用 再次重新获取

                SourceDic.TryUpdate(oldKey, false, true); //清除占用
                SourceDic.TryUpdate(key, true, false); ////占用
            }

            return key;
        }

        //更新Label
        private void UpdateLabel(int controlId)
        {
            var action = new Action(() =>
            {
                if (this.Controls["label" + controlId] is Label label)
                {
                    label.Text = ResultDic[controlId].ToString();
                }

                //前6个数字有值相等 报异常
                if (ResultDic.Take(6).Select(x => x.Value).Distinct().Count() != 6)
                {
                    throw new Exception("前6位有重复值");
                }
            });

            this.Invoke(action);
        }
    }

---

效果如图：