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(, ))
             {
                 SourceDic.TryAdd(i, false);
             }

             foreach (var i in Enumerable.Range(, ))
             {
                 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(, ))
             {
                 Task.Factory.StartNew(o =>
                 {
                     var controlId = Convert.ToInt32(o);
                     while (!_cts.IsCancellationRequested)
                     {
                         if (controlId == )//==7表示是绿球
                         {
                             ResultDic.TryGetValue(, out var value);
                             ResultDic.TryUpdate(, Random.Next(, ), 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(, );
                 } 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().Select(x => x.Value).Distinct().Count() != )
                 {
                     throw new Exception("前6位有重复值");
                 }
             });

             this.Invoke(action);
         }
     }

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效果如图：