您将如何简化进入和退出 ReaderWriterLock?

问题描述

这对我来说似乎很吵.五行开销实在是太大了.

This seems very noisy to me. Five lines of overhead is just too much.

m_Lock.EnterReadLock()
Try
    Return m_List.Count
Finally
    m_Lock.ExitReadLock()
End Try

那么你会如何简单地做到这一点?

So how would you simply this?

推荐答案

我也是这么想的，但是在 C# 中；-p

I was thinking the same, but in C# ;-p

using System;
using System.Threading;

class Program
{
    static void Main()
    {
        ReaderWriterLockSlim sync = new ReaderWriterLockSlim();

        using (sync.Read())
        {
           // etc
        }
    }


}
public static class ReaderWriterExt
{
    sealed class ReadLockToken : IDisposable
    {
        private ReaderWriterLockSlim sync;
        public ReadLockToken(ReaderWriterLockSlim sync)
        {
            this.sync = sync;
            sync.EnterReadLock();
        }
        public void Dispose()
        {
            if (sync != null)
            {
                sync.ExitReadLock();
                sync = null;
            }
        }
    }
    public static IDisposable Read(this ReaderWriterLockSlim obj)
    {
        return new ReadLockToken(obj);
    }
}

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