Question

我有自定义缓存依赖

class MyCacheDependency : CacheDependency
{
    private const int PoolInterval = 5000;
    private readonly Timer _timer;
    private readonly string _readedContent;

    public MyCacheDependency()
    {
        _timer = new Timer(CheckDependencyCallback, this, PoolInterval, PoolInterval);
        _readedContent = ReadContentFromFile();
    }

    private void CheckDependencyCallback(object sender)
    {
        lock (_timer)
        {
            if (_readedContent != ReadContentFromFile())
            {
                NotifyDependencyChanged(sender, EventArgs.Empty);
            }
        }
    }

    private static string ReadContentFromFile()
    {
        return File.ReadAllText(@"C:\file.txt");
    }

    protected override void DependencyDispose()
    {
        if (_timer != null) _timer.Dispose();

        base.DependencyDispose();
    }
}

它完美无缺，但我想知道如何一次刷新所有对象。在这里我放入缓存2个对象

Cache.Insert（“c1”，“var1”，new MyCacheDependency（））;

Cache.Insert（“c2”，“vae2”，new MyCacheDependency（））;

很好，但是当c1会检测到更改时如何强制c2不要等待5秒来检查但我想在c1执行时调用自己的DependencyDispose。

换句话说，如果c1检测到变化，c2也应该调用DependencyDispose

Answer 1

也许你可以在CheckDependencyCallback（）方法中添加一个静态事件。在MyCacheDependency的构造函数中，您将附加一个事件处理程序。当事件被触发时，你可以从那里调用NotifyDependencyChanged或DependencyDispose。这样，所有MyCacheDependency对象都会对更改做出反应。

class MyCacheDependency : CacheDependency
{
    private const int PoolInterval = 5000;
    private readonly Timer _timer;
    private readonly string _readedContent;

    public static event EventHandler MyEvent;

    public MyCacheDependency()
    {
        _timer = new Timer(CheckDependencyCallback, this, PoolInterval, PoolInterval);
        _readedContent = ReadContentFromFile();
        MyEvent += new EventHandler(MyEventHandler);
    }

   protected void MyEventHandler(object sender, EventArgs e) {
    NotifyDependencyChanged(sender, e);
   }

    private void CheckDependencyCallback(object sender)
    {
        lock (_timer)
        {
            if (_readedContent != ReadContentFromFile())
            {
                if(MyEvent!=null)
                    MyEvent(sender, EventArgs.Empty);
            }
        }
    }

    private static string ReadContentFromFile()
    {
        return File.ReadAllText(@"C:\file.txt");
    }

    protected override void DependencyDispose()
    {
        if (_timer != null) _timer.Dispose();

        base.DependencyDispose();
    }
}

asp.net自定义缓存依赖项，一次刷新所有内容

1 个答案: