The locker in C#
2017-02-20 13:31:00 #C#

同步锁

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private int _value;
private readonly object locker = new object();
private void Increment()
{
    lock (locker)
    {
        _value += 1;
    }
}

异步锁

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private int _value;
private readonly SemaphoreSlim slim = new SemaphoreSlim(1);
public async Task DelayAndIncrementAsync()
{
    await slim.WaitAsync();
    try
    {
        var oldValue = _value;
        await Task.Delay(TimeSpan.FromSeconds(5));
        _value = oldValue + 1;
    }
    catch (Exception)
    {
        throw;
    }
    finally
    {
        slim.Release();
    }
}

区别

  1. 同步锁中不能使用异步操作
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2017-02-20 13:31:00 #C#
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