C#中使用lock和using语法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace ExitGames.Threading
{
[StructLayout(LayoutKind.Sequential)]
public struct Lock : IDisposable
{
private readonly object lockObject;
private Lock(object obj)
{
this.lockObject = obj;
Monitor.TryEnter(obj);
}

private Lock(object obj, int timeout)
{
this.lockObject = obj;
if (!Monitor.TryEnter(obj, timeout))
{
throw new LockTimeoutException();
}
}

public static IDisposable Enter(object syncObject)
{
return new Lock(syncObject);
}

public static IDisposable TryEnter(object syncObject, int millisecondsTimeout)
{
return new Lock(syncObject, millisecondsTimeout);
}

public void Dispose()
{
Monitor.Exit(this.lockObject);
}
}

}