UIAutomation，AutomationFocusChangedEventHandler和Mozilla Thunderbird 5.0的内存泄漏

问题描述

 

很抱歉在这里提出Thunderbird，但我的C#4.0客户端框架示例应用程序存在问题，只是使用System.Windows.Automation.Automation注册了AutomationFocusChangedEventHandler.

sorry for coming up with Thunderbird here but I have a problem with my C# 4.0 client framework sample application just registering an AutomationFocusChangedEventHandler using System.Windows.Automation.Automation.

当我现在启动Mozilla Thunderbird 5.0并选择一封电子邮件时，每选择一封电子邮件，C#应用程序的非托管堆都会增长大约300kB.如果我大约每秒按下一次光标键以选择其他电子邮件，则堆会增长，并且成长和 永远不会再释放.

When I now start Mozilla Thunderbird 5.0 and select an email, the C# application's unmanaged heap grows about 300kB with each selected email. If I press the cursor key down about once a second for selecting other emails, the heap grows and grows and is never freed again.

我验证了在任务管理器的内存(私有工作集)"列中，转储了垃圾收集器的堆大小并使用SciTech .NET内存分析器对其进行了概要分析.

I verified that in task manager's column 'Memory (Private Working Set)', dumping the garbage collectors heap size and profiling it using SciTech .NET memory profiler.

 

这里是示例代码:

 

using System;
using System.Runtime.CompilerServices;
using System.Windows.Automation;
using System.Windows.Forms;

namespace MySimpleApp
{
 public class UiFocusHandler : ApplicationContext
 {
 public UiFocusHandler()
 {
 AddAutomationFocusChangedEventHandler();
 }

 [MethodImplAttribute(MethodImplOptions.NoInlining)]
 private void AddAutomationFocusChangedEventHandler()
 {
 Automation.AddAutomationFocusChangedEventHandler(
 new AutomationFocusChangedEventHandler(OnFocusChange));
 }

 [MethodImplAttribute(MethodImplOptions.NoInlining)]
 private void OnFocusChange(object src, AutomationFocusChangedEventArgs e)
 {
 }
 }

 static class Program
 {
 [STAThread]
 static void Main()
 {
 Application.Run(new UiFocusHandler());
 }
 }
}

推荐答案

 

IUIAutomationCacheRequest cacheRequest = _automation.CreateCacheRequest();
cacheRequest.AddProperty(_propertyIdName);
cacheRequest.AddProperty(_propertyIdBoundingRectangle);

IUIAutomationCacheRequest cacheRequest = _automation.CreateCacheRequest();
cacheRequest.AddProperty(_propertyIdName);
cacheRequest.AddProperty(_propertyIdBoundingRectangle);

//以上属性是我们所需要的，因此我们不需要引用
//接收到事件时的源元素.
cacheRequest.AutomationElementMode = AutomationElementMode.AutomationElementMode_None;

// The above properties are all we'll need, so we have have no need for a reference
// to the source element when we receive the event.
cacheRequest.AutomationElementMode = AutomationElementMode.AutomationElementMode_None;

//现在设置事件处理程序.
_automation.AddFocusChangedEventHandler(cacheRequest，this);

// Now set up the event handler.
_automation.AddFocusChangedEventHandler(cacheRequest, this);

 

作为测试，您可以尝试将此示例应用程序与电子邮件应用程序一起使用，以查看其是否存在相同的内存问题.
 
谢谢
 
盖伊

As a test, you might try using this sample app with the e-mail app and see if it exhibits the same memory issues.
 
Thanks,
 
Guy

 

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