WPF：消失的图标 [英] WPF: Disappearing icons

问题描述

我有几个在Window.Resources中声明的图标。它们在第一次出现时显示正常（例如：单击菜单，MenuItem图标有效），但在显示另一个菜单（例如：上下文菜单）后，原始图标消失且不返回。好像第一次使用该图标的最后一个元素就是保留它。

I have several icons which are declared in Window.Resources. They show up fine the first time they need to appear (eg: a Menu is clicked, the MenuItem icon works), but after another Menu (eg: a context menu) is shown, the original icon disappears and does not return. It's as though the last element which used the icon for the first time gets to keep it.

<Window.Resources>
    <Image x:Key="Chart_16"
           Source="pack://application:,,,/Resources/images/chart_16.png" />
    ...
<Window.Resources>

<MenuItem Header="Summary"
          Command="loc:AppCommands.ShowSummary"
          Icon="{StaticResource Chart_16}" />

我尝试将其保存为24位PNG，隔行扫描24位PNG和8位PNG但是同样的事情发生了这不仅仅是一个，在多个地方使用的每个图标都是这样的。

I've tried saving it as a 24bit PNG, an interlaced 24bit PNG and an 8bit PNG but the same thing happens. It's not just one, every icon which is used in more than one place behaves this way.

推荐答案

那是因为你的资源是一个 Image ，这是 Control 。 控制 s只能有一个父级，因此它可以动态地在每个 MenuItem 中重新设置父级。

That's because your resource is an Image, which is a Control. Controls can only have one parent so it's effectively being re-parented in each MenuItem on the fly.

您的选择是：

1. 不要使用 Image 而是使用 ImageSource 或甚至包含图像URI的字符串。


2. 使用 x：Shared XAML属性将资源设置为非共享。这将根据需要创建多个图像控件。

1. Don't use Image and instead use ImageSource or even a string containing the URI of the image.
2. Set the resource to non-shared with the x:Shared XAML attribute. This will create multiple Image controls as needed.

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