XAML和WindowsFormsHost的内存泄漏 [英] Memory leak with XAML and WindowsFormsHost

问题描述

首先，我向您展示我所拥有的，然后再解释我的问题.
我有一个代码，可以根据属性布局"在样式之间进行切换，可以是"Layout1"或"Layout2".

First I show you what I have and than I explain my problem.
I have a code where I can switch between styles depending on the property "Layout", which can be "Layout1" or "Layout2".

<Grid>
    <ContentControl Style="{Binding Layout}">
    </ContentControl>
</Grid>

以下是样式定义:

Here are the Style definitions:

 <Style x:Key="Layout1" TargetType="{x:Type ContentControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ContentControl}">
                .....
                <ContentControl Style="{StaticResource myWindow}">
                </ContentControl>
                .....
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

 <Style x:Key="Layout2" TargetType="{x:Type ContentControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ContentControl}">
                .....
                <ContentControl Style="{StaticResource myWindow}">
                </ContentControl>
                .....
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

每个样式都使用静态资源"myWindow".在myWindow中，一个类myControl和myControl使用WindowsFormsControl myControl5.

Each Style use the static ressource "myWindow". In myWindow is a class myControl and myControl use a WindowsFormsControl myControl5.

<Style x:Key="myWindow" TargetType="{x:Type ContentControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ContentControl}">
                <Grid >
                    <local:myControl Margin="0,0,0,0"
                    </local:myControl>
                </Grid>
             </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<Style TargetType="{x:Type local:myControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:myControl}">
                <WindowsFormsHost x:Name="PART_WindowsFormsHost">
                    <cbh:myControl5></cbh:myControl5>
                </WindowsFormsHost>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

在myControl类中，我获得了myControl5的句柄，因此可以使用它来添加事件处理程序.

In the class myControl I get the handle to myControl5 so I can use it to adding event handler.

public class myControl : Control
{
    public override void OnApplyTemplate ()
    {
        base.OnApplyTemplate ();
        this.windowsFormsHost = GetTemplateChild ("PART_WindowsFormsHost") as WindowsFormsHost;
        myControl5 mc5 = this.InnerControl;
        mc5.GotFocus += new EventHandler(InnerControl_GotFocus);
        .....
    }
}

现在我的问题是:
每次更改样式布局时，我都会看到WPF创建了一个新的myControl，但从未发布过.因此，内存使用量每次都会增加.
我希望说明如此有用，您可以说"Natch，您忘记了……"或类似的内容.

Now my problem:
Each time the Style Layout change, I see that WPF creates a new myControl but never release it. So the memory usage increase each time.
I hope the explaining is so useful, that you can say "Natch, you forgot ..." or something like that.

推荐答案

mc5.GotFocus += new EventHandler(InnerControl_GotFocus);

此事件与本地上下文相关，我想您不会释放此引用.请删除此钩子以及所有其他存在的钩子，如下所示.

进行全局引用并在下次调用Apply模板时取消挂接事件.

This event is hooked with in the local context, and I guess you dont release this reference. Please remove this hook and any others if exists as follows.

make a global reference and unhook the event the next time apply template is invoked.

        myControl5 mc5 = null;
public override void OnApplyTemplate ()
    {
        if(mc5!=null)
          mc5.GotFocus += new EventHandler(InnerControl_GotFocus);

        base.OnApplyTemplate ();
        this.windowsFormsHost = GetTemplateChild ("PART_WindowsFormsHost") as WindowsFormsHost;
        mc5 = this.InnerControl;
        mc5.GotFocus += new EventHandler(InnerControl_GotFocus);
    }

希望对您有帮助！

Hope it helps!!!

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