最近,我被要求实现一个类作为选择过程的一部分。我按要求做了这个节目。但是,我考试不及格。我真的很想知道我的解决方案出了什么问题。任何帮助都非常感谢。问题和我的解决方案如下

实现一个线程安全类,该类在构造过程中每秒触发一个事件。需要有一个函数来查找经过的秒数。这个类必须实现IDisposable,调用dispose后对seconds elapsed函数的任何调用都应该失败。

我的解决方案:

namespace TimeCounter

{

public delegate void SecondsElapsedHandler(object o, EventArgs e);

///

/// Summary description for SecondCounter

///

public class SecondCounter : IDisposable

{

private volatile int nSecondsElapsed;

Timer myTimer;

private readonly object EventLock = new object();

private SecondsElapsedHandler secondsHandler;

public SecondCounter()

{

nSecondsElapsed = 0;

myTimer = new Timer();

myTimer.Elapsed += new ElapsedEventHandler(OneSecondElapsed);

myTimer.Interval = 1000;

myTimer.AutoReset = false;

myTimer.Start();

}

public void OneSecondElapsed(object source, ElapsedEventArgs e)

{

try

{

SecondsElapsedHandler handlerCopy;

lock (EventLock)

{

handlerCopy = secondsHandler;

nSecondsElapsed++;

}

if (secondsHandler != null)

{

secondsHandler(this, e);

}

}

catch (Exception exp)

{

Console.WriteLine("Exception thrown from SecondCounter OneSecondElapsed " + exp.Message);

}

finally

{

if (myTimer != null)

{

myTimer.Enabled = true;

}

}

}

public event SecondsElapsedHandler AnotherSecondElapsed

{

add

{

lock (EventLock)

{

secondsHandler += value;

}

}

remove

{

lock (EventLock)

{

secondsHandler -= value;

}

}

}

public int SecondsElapsed()

{

if (this.IsDisposed)

{

throw new ObjectDisposedException("SecondCounter");

}

return nSecondsElapsed;

}

private bool IsDisposed = false;

public void Dispose()

{

Dispose(true);

GC.SuppressFinalize(this);

}

private void Dispose(bool Disposing)

{

if (!IsDisposed)

{

if (Disposing)

{

}

if (myTimer != null)

{

myTimer.Dispose();

}

}

secondsHandler = null;

IsDisposed = true;

}

~SecondCounter()

{

Dispose(false);

}

}

}