我必须用我的WPF导航内存泄漏？ [英] Do I have a memory leak in my WPF Navigation?

问题描述

我期待通过WPF应用程序寻找一个内存泄漏（使用蚂蚁内存分析器5.1），我不断看到一些页面和控件占用内存时，他们不应该。

I'm looking through a WPF application looking for a memory leak (using ANTS Memory Profiler 5.1) and I keep seeing some pages and controls taking up memory when they shouldn't be.

所以我去的对象保持图表，看看是什么让他们过来，我总是看到这样的每一页：

So I go to the Object Retention Graph and to see what is keeping them around, and I keep seeing this for every page:

的事情是，我的KeepAlive设置为false每一页上，我不认为这样的属性存在，对用户的控制。

The thing is, I have KeepAlive set to false on every page, and I don't think such a property exists on the user controls.

谁能告诉我，我应该找谁？这甚至是内存泄漏或者是一个WPF应用程序这是正常的行为呢？

Can anyone tell me what I should be looking for? Is this even a memory leak or is this normal behaviour for a WPF application?

推荐答案

是的，根据您提供什么，你有内存泄漏。当你找到了引用链，它不是在你的code，走最简单的方法是...反射。

Yes, according to what you've provided, you have a memory leak. When you found the references chain, and it's not in your code, the easiest way to go would be... Reflector.

图片说： JournalEntryKeepAlive._keepAliveRoot 字段保存引用的对象。让我们在反射器，看看这家伙是如何迷上我们的目标。

Image says: JournalEntryKeepAlive._keepAliveRoot field holds a reference to the object. Let's go in Reflector and see how this guy is hooked with our object.

这一次，它是容易的，和所有的痕迹导致 NavigationService.MakeJournalEntry（）函数，然后到 NavigationService.IsContentKeepAlive（）。在这里，它是：

This time it was easy, and all traces lead to NavigationService.MakeJournalEntry() function and then to NavigationService.IsContentKeepAlive(). Here it is:

internal bool IsContentKeepAlive()
{
    bool keepAlive = true;
    DependencyObject dependencyObject = this._bp as DependencyObject;
    if (dependencyObject != null)
    {
        keepAlive = JournalEntry.GetKeepAlive(dependencyObject);
        if (!keepAlive)
        {
            PageFunctionBase base2 = dependencyObject as PageFunctionBase;
            bool flag2 = !this.CanReloadFromUri;
            if ((base2 == null) && flag2)
            {
                keepAlive = true;
            }
        }
    }
    return keepAlive;
}

现在你知道的规则。对象是保存在内存中，如果：

Now you know the rules. Object is kept in memory if:

• 这不是一个依赖对象;
• 在附加属性格式JournalEntry.KeepAlive是真实的;
• 这不是一个的PageFunction，它不能从乌里重新加载。

在本次调查也可能是值得一读更多关于<一个href="http://msdn.microsoft.com/en-us/library/system.windows.controls.page.keepalive.aspx">JournalEntry.KeepAlive物业MSDN上。

After this investigation it may be worth reading more about JournalEntry.KeepAlive property on MSDN.

此战略帮助我找到很多内存相关的昆虫。希望它可以帮助你太：）

This strategy helped me to find many memory-related insects. Hope it helps you too :).

PS：如果你跟上找到这个特殊的泄漏有问题，你可以粘贴最低code样品为我们重现它，给你更多的正确的答案

PS: If you keep having problem with finding this particular leak, you could paste minimal code sample for us to reproduce it and give you more proper answer.

干杯， Anvaka

Cheers, Anvaka

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