是静态类成员寄托？ [英] Are static class members pinned?

问题描述

我有一个C＃类，有一个静态的ImageList对象。此图片名单将在我的应用程序的多个形式多样的ListView头（通过SendMessage函数... HDM_SETIMAGELIST）共享。

I have a C# class, having a static ImageList object. This image list will be shared with various ListView headers (via SendMessage... HDM_SETIMAGELIST) on several forms in my application.

虽然我明白，静态对象不符合垃圾收集，这是我不清楚，如果他们还没有资格获得搬迁（压缩）被垃圾收集器。难道我还需要这脚对象，因为它是与非托管代码共享，也就是说，使用GCHandle.Alloc？

Though I understand that static objects are not eligible for garbage collection, it is not clear to me if they are also ineligible for relocation (compaction) by the garbage collector. Do I also need to pin this object since it is shared with unmanaged code, say, using GCHandle.Alloc?

环境是VS 2008，Compact Framework的3.5。

Environment is VS 2008, Compact Framework 3.5.

推荐答案

该实例本身也不是一成不变的。该参考。如果你空引用的实例就符合了GC。在内部，所有静态实例是通过一个固定手柄静态数组引用。即实例是隐式运行时固定。

The instance itself is not static. The reference is. If you null the reference the instance becomes eligible for GC. Internally, all static instances are references through a pinned handle to an array of statics. I.e. the instance is implicitly pinned by the runtime.

如果你看一下声明为静态成员实例的GCroot，你会看到这样的事情：

If you look at the GCroot of an instance declared as a static member, you'll see something like this:

HandleTable:
    008113ec (pinned handle)
    -> 032434c8 System.Object[]
    -> 022427b0 System.Collections.Generic.List`1[[System.String, mscorlib]]

如果您空静态参考固定阵列中的相应项置空为好。

If you null the static reference the corresponding entry in the pinned array is nulled as well.

现在，这些都是明显的实施细则，使他们有可能改变。

Now, these are obviously implementation details so they could potentially change.

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