如何在此 C# 示例中避免 while(true)

Question

我正在寻找一种方法来用更高效的东西（例如事件驱动代码）替换此 while 循环。

While(true)\ must constantly monitor units
{ 
  if(units.count< 10)
  {    
    \ launch units    
  }

  thread.sleep(100); \ to avoid 100% CPU usage
}

单元可以在其他线程中删除，它们在线程安全的concurrentDictionary 中。

如果您提出更好地实施此代码的建议，我将不胜感激。

谢谢

Answer 1

您可以使用计时器摆脱 while 和 thread.sleep，同时摆脱主线程上的阻塞：

private static void OnTimedEvent(object source, System.Timers.ElapsedEventArgs e)
{
    if(unitsCount < 10)
    {    
        //launch Units
    }
 }

public static void Main (string[] args) 
{
    System.Timers.Timer aTimer = new System.Timers.Timer();
    aTimer.Elapsed+=new System.Timers.ElapsedEventHandler(OnTimedEvent);

    aTimer.Interval=100;
    aTimer.Enabled=true;
}

工作示例：fiddle

Timer Documentation

Related Answer

Answer 2

这是我使用事件创建的示例，它显然不完整，但您应该能够向其中添加您需要的内容以按照您的需要获得它。

当从字典中删除键时检查字典的计数，然后如果计数小于指定的数字则触发事件。

注意：我不知道这是否是线程安全的，我不熟悉使用线程，我希望 ConcurrentDictionary 能解决这个问题。

public static partial class Program 
{
    static void Main(string[] args)
    {
        DictionaryCount<int, string> dict = new DictionaryCount<int, string>();
        dict.CountLessThan += dict_TryRemove;
        dict.CountToFireOn = 1;
        dict.TryAdd(1, "hello");
        dict.TryAdd(2, "world");
        dict.TryAdd(3, "!");
        string outValue;
        dict.TryRemove(2, out outValue);
        dict.TryRemove(1, out outValue);
        Console.ReadKey(true);
    }

    private static void dict_TryRemove(object sender, CountEventArgs e)
    {
        DictionaryCount<int, string> dict = sender as DictionaryCount<int, string>;
        Console.WriteLine(dict.Count);
        Console.WriteLine("Count less than 2!");
    }

    public class DictionaryCount<TKey, TValue> : ConcurrentDictionary<TKey, TValue>
    {
        public int CountToFireOn { get; set; }

        public DictionaryCount() : base() { }

        public delegate void CountEventHandler(object sender, CountEventArgs e);
        public event CountEventHandler CountLessThan;

        public new bool TryRemove(TKey key, out TValue value)
        {
            bool retVal = base.TryRemove(key, out value);
            if (this.Count <= CountToFireOn)
            {
                CountEventArgs args = new CountEventArgs(this.Count);
                CountLessThan(this, args);
            }
            return retVal;
        }
    }

    public class CountEventArgs
    {
        public int Count { get; set; }

        public CountEventArgs(int count)
        {
            this.Count = count;
        }
    }
}

如何在此 C# 示例中避免 while(true)

How to avoid while(true) in this C# example

c#

events

multithreading

monitor