我有这样的对象 preloadClient 它实现的IDisposable ，我要处理它，但经过异步方法完成他们的要求......这是不会发生

 私人无效preLOAD（SlideHandler幻灯片）
    {
        使用（preloadClient客户端=新的preloadClient（））
        {
             客户端preloadCompleted + = client_ preloadCompleted。
             。客户端preLOAD（幻灯片）;
        }
        //这里的客户端布置在紧靠
    }
    私人无效client_ preloadCompleted（对象发件人，幻灯preloadCompletedEventArgs E）
    {
     //此方法是经过一段时间被调用，
     //但错误抛出试图访问对象时的状态（字段，属性）
    }
 

因此​​，任何想法或变通??

解决方案

您不应使用使用结构，而是处理你的对象时，他们不再需要的：

  //保持强引用列表，以避免垃圾收集，
//和处置他们都在的情况下，我们正在处理的封装对象
私人只读表＆LT; preloadClient＆GT; _activeClients =新的名单，其中，preloadClient＆GT;（）;
私人无效preLOAD（SlideHandler幻灯片）
{
    preloadClient客户端=新的preloadClient（）;
    _activeClients.Add（客户端）;
    客户端preloadCompleted + = client_ preloadCompleted。
    。客户端preLOAD（幻灯片）;
}

私人无效client_ preloadCompleted（对象发件人，
     幻灯preloadCompletedEventArgs E）
{
    preloadClient客户端=发件人为preloadClient;

    //做的东西

    。客户端preloadCompleted  -  = client_ preloadCompleted;
    client.Dispose（）;
    _activeClients.Remove（客户端）;
}
 

在这种情况下，你必须在处理主类，以处理所有的客户端：

 保护覆盖的Dispose（BOOL处置）
{
    的foreach（在_activeClients preloadClient客户端）
    {
        。客户端preloadCompleted  -  = client_ preloadCompleted;
        client.Dispose（）;
    }
    _activeClients.Clear（）;
    base.Dispose（处置）;
}
 

注意，此实现不是线程安全的

访问 _activeClients 列表必须是的线程安全，作为你的 preloadCompleted 方法被调用从不同的线程 您的包含对象可以是客户端在事件之前处理。在这种情况下，做的东西应该什么都不做，所以这是另外一件事，你应该照顾。 这可能是使用一个好主意尝试 / 最后事件处理程序内部的块，以确保该对象被设置在所有情况下

I have this object PreloadClient which implements IDisposable, I want to dispose it, but after the asynchronous methods finish their call... which is not happening

    private void Preload(SlideHandler slide)
    {
        using(PreloadClient client = new PreloadClient())
        {                 
             client.PreloadCompleted += client_PreloadCompleted;
             client.Preload(slide);
        }
        // Here client is disposed immediately
    }
    private void client_PreloadCompleted(object sender, SlidePreloadCompletedEventArgs e)
    {
     // this is method is called after a while, 
     // but errors are thrown when trying to access object state (fields, properties)
    }

So, any ideas or work arounds ??

解决方案

You shouldn't use the using construct, but rather dispose your objects when they are no longer needed:

// keep a list of strong references to avoid garbage collection,
// and dispose them all in case we're disposing the encapsulating object
private readonly List<PreloadClient> _activeClients = new List<PreloadClient>();
private void Preload(SlideHandler slide)
{
    PreloadClient client = new PreloadClient();
    _activeClients.Add(client);
    client.PreloadCompleted += client_PreloadCompleted;
    client.Preload(slide);
}

private void client_PreloadCompleted(object sender,
     SlidePreloadCompletedEventArgs e)
{
    PreloadClient client = sender as PreloadClient;

    // do stuff

    client.PreloadCompleted -= client_PreloadCompleted;
    client.Dispose();
    _activeClients.Remove(client);
}

in this case, you have to dispose all clients when disposing the main class:

protected override Dispose(bool disposing)
{
    foreach (PreloadClient client in _activeClients)
    { 
        client.PreloadCompleted -= client_PreloadCompleted;
        client.Dispose();
    }
    _activeClients.Clear();
    base.Dispose(disposing);
}

Note that this implementation is not thread safe

Access to the _activeClients list must be made thread-safe, as your PreloadCompleted method is called from a different thread Your containing object may be disposed before a client fires the event. In that case "do stuff" should do nothing, so this is another thing you should take care of. It might be a good idea to use a try/finally block inside your event handler, to make sure that the object gets disposed in all cases