c# - .Net 中的控制台问题

Question

我刚刚学习如何使用 C# 中的线程机制。我从 msdn 上拿了一个例子，并对其进行了修改，设计了一个像这样的简单游戏。但问题是 DoWork 方法中的 while 循环甚至在从主程序调用 DoWork 方法之前就读取键。IE。当您在屏幕上出现“Go:”之前运行程序时，如果您在 DoWork 方法中循环读取键时键入一些内容。但是在屏幕上打印“Go:”后，控制应该传递给 while 循环，对。有人可以解释一下为什么会这样吗？谢谢。

 public class Worker    
{
  ConsoleKeyInfo cki;  
  StringBuilder sb = new StringBuilder();
  bool f = true;

// This method will be called when the thread is started.
public void DoWork()
{
    Console.SetCursorPosition(49, 8);
    Console.Write("Go:");
    Console.SetCursorPosition(53, 8);

    while (!_shouldStop)
    {         
       cki = Console.ReadKey(true);
       if (f == true && (65 <= Convert.ToInt32(cki.Key) && Convert.ToInt32(cki.Key) <= 90))
       {
           Console.Write(cki.Key.ToString());               
           sb.Append(cki.Key.ToString());
       }  
    }
    while (true)
    {
        if (cki.Key.ToString() == "Enter") break;
        cki = Console.ReadKey(true);
        if (cki.Key.ToString() == "Enter") break;
    }
}
public void RequestStop(string word)
{
    _shouldStop = true;
    f =false;
    Console.WriteLine();
    Console.SetCursorPosition(44, 10);
    Console.WriteLine("- TIME OUT -");
    Console.SetCursorPosition(46, 12);
    if (sb.ToString() == word.ToUpper())
    {
        Console.WriteLine("CORRECT !");
        Console.SetCursorPosition(42, 13);
        Console.WriteLine("CONGRATULATIONS");
    }
    else { Console.SetCursorPosition(47, 12); Console.WriteLine("WRONG !"); }
    Console.SetCursorPosition(40, 15);
    Console.WriteLine("Press [Enter] to quit");
    Console.CursorVisible = false;
}

 private volatile bool _shouldStop;

}

public class WordPlay
{
  static void Main()
  {
    Console.SetBufferSize(100,50);
    Console.SetWindowSize(100,50);
    string[] words = { "angstrom", "abacinate", "abactinal", "abandoned", "Babesiidae", "babirussa", "Babylonian", "bacchantic", "cabassous", "cableway" };
    string word="";      
    Random randObj = new Random(0);
    Console.SetCursorPosition(40, 6);
    Console.WriteLine("Your String:");
    Console.WriteLine();       
    for (int j = 0; j < 20; j++)
    { 
       System.Threading.Thread.Sleep(150); Console.SetCursorPosition(53, 6); 
       Console.Write(words[randObj.Next(words.Length - 1)].ToUpper() + "     ");  
    }

    word = words[randObj.Next(words.Length - 1)].ToUpper();
    Console.SetCursorPosition(53, 6);
    Console.Write( word+"    ");
    Console.WriteLine();

    // Create the thread object. This does not start the thread.
    Worker workerObject = new Worker();
    Thread workerThread = new Thread(workerObject.DoWork);

    // Start the worker thread.
    workerThread.Start();

    // Loop until worker thread activates.
    while (!workerThread.IsAlive);

    // Put the main thread to sleep for 1 millisecond to
    // allow the worker thread to do some work:

    Thread.Sleep(3000);
    // Request that the worker thread stop itself:

    workerObject.RequestStop(word);

    // Use the Join method to block the current thread 
    // until the object's thread terminates.

    workerThread.Join();      
}

Answer 1

乔·阿尔巴哈里的 free ebook on threading是一个很好的介绍。