处置WPF用户控件 [英] Disposing WPF User Controls

问题描述

我已创建自定义WPF用户控制，其目的是用于由第三方。我控制了这是一次性的私有成员，我想，以确保其Dispose方法总是会被调用一次，包含窗口/关闭应用程序。但是，用户控件不是一次性的。我试图实现IDisposable接口和订阅卸载的事件，但没有得到主机的应用程序关闭时调用。如果可能的话，我不想依靠消费者我的控制记住调用特定的Dispose方法。

 公共部分类MyWpfControl：用户控件
 {
     SomeDisposableObject X;

     //其中，这是否code去了？
     无效某处（）
     {
         如果（X！= NULL）
         {
             x.Dispose（）;
             X =零;
         }

     }
 }
 

我已经发现迄今唯一的解决办法是订阅分派器的ShutdownStarted事件。这是一个合理的方法？

  this.Dispatcher.ShutdownStarted + = Dispatcher_ShutdownStarted;
 

解决方案

在这里有趣的博客文章：

<一个href="http://geekswithblogs.net/cskardon/archive/2008/06/23/dispose-of-a-wpf-usercontrol-ish.aspx">http://geekswithblogs.net/cskardon/archive/2008/06/23/dispose-of-a-wpf-usercontrol-ish.aspx

它提到订阅<一个href="http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher.shutdownstarted.aspx">Dispatcher_ShutDownStarted处置你的资源。

I have created a custom WPF user control which is intended to be used by a third party. My control has a private member which is disposable, and I would like to ensure that its dispose method will always get called once the containing window/application is closed. However, UserControl is not disposable. I tried implementing the IDisposable interface and subscribing to the Unloaded event but neither get called when the host application closes. If at all possible, I don't want to rely on consumers of my control remembering to call a specific Dispose method.

 public partial class MyWpfControl : UserControl
 {
     SomeDisposableObject x;

     // where does this code go?
     void Somewhere() 
     {
         if (x != null)
         {
             x.Dispose();
             x = null;
         }

     }
 }

The only solution I have found so far is to subscribe to the Dispatcher's ShutdownStarted event. Is this a reasonable approach?

this.Dispatcher.ShutdownStarted += Dispatcher_ShutdownStarted;

解决方案

Interesting blog post here:

http://geekswithblogs.net/cskardon/archive/2008/06/23/dispose-of-a-wpf-usercontrol-ish.aspx

It mentions subscribing to Dispatcher_ShutDownStarted to dispose of your resources.

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