如何通过XAML为Enum的子类设置MenuItem的IsChecked属性? [英] How to set a MenuItem's IsChecked property for a child of type Enum via XAML?
问题描述
我使用此解决方案将MenuItem绑定到枚举。
I've bound a MenuItem to a Enum using this solution.
枚举值正确显示,但我似乎无法为MenuItem的子项目设置默认检查值。
The Enum Values are displayed correctly, yet I cannot seem to set a default checked value for the MenuItem's children items.
或者,我希望MenuItem在默认情况下检查其子项之一(我使用的枚举的值)。
Alternatively put, I would like the MenuItem to have one of its children items (the values of the enum I'm using) checked per default.
我尝试了以下代码,使用Style和触发Setter:
I've tried the following code, using a Style and a triggered Setter :
<ContextMenu>
<MenuItem Header="Some Setting" Name="SomeSettingMenu" DataContext="{Binding}"
ItemsSource="{Binding Source={StaticResource DisplayTypeValues}}"
Click="SomeSettingClicked">
<MenuItem.ItemContainerStyle>
<Style TargetType="MenuItem">
<Setter Property="MenuItem.IsCheckable" Value="True"/>
<Style.Triggers>
<Trigger Property="MenuItem.Header" Value="enums:AnEnum.ItemA" >
<Setter Property="MenuItem.IsChecked" Value="True"/>
</Trigger>
</Style.Triggers>
</Style>
</MenuItem.ItemContainerStyle>
</MenuItem>
</ContextMenu>
枚举包含值,如ItemA,我也尝试过 AnEnum。触发器值属性中的第一个
或 0
(如在这里回答),没有用。
The enum contains values such as ItemA, I've also tried AnEnum.First
or 0
in the Trigger Value attribute (as answered here), to no avail.
将一个 DataTrigger
是可取的吗?如果是这样,我怎么能在XAML中写?
或者我应该在 ItemTemplate
中为 MenuItem
使用 DataTemplate
code>?
Would a DataTrigger
be advisable ? If so, how can I write that in XAML ?
Or should I use an DataTemplate
within an ItemTemplate
for the MenuItem
?
我也试过用代码隐藏在 SomeSetting.Items
相关的方法,但大多数属性(如Current)是只读的。
I've also tried fiddling around in code-behind with SomeSetting.Items
-related methods, yet most of the properties (such as Current) are read-only.
我知道你可以写 SomeSettingMenu.ItemsSource = Enum.GetValues(typeof(....))
在代码隐藏中,但我又不知道如何通过编程方式在MenuItem中选择一个项目。
I am aware that you can write SomeSettingMenu.ItemsSource = Enum.GetValues(typeof(....))
in code-behind, but yet again I don't know how to select an Item within the MenuItem programmatically.
我也尝试过这个代码,不工作:
I've also tried this code, doesn't work as well :
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Header}" Value="enums:DisplayType.ItemA">
<Setter Property="IsChecked" Value="True" />
</DataTrigger>
</Style.Triggers>
枚举
是不同程序集的命名空间我正在使用。
enums
is a namespace from a different assembly I'm using.
任何想法都不胜感激,谢谢你提前!
Any thoughts would be appreciated, thank you in advance !
推荐答案
在您的解决方案中考虑更改
in your solution consider changing
<Trigger Property="MenuItem.Header" Value="enums:AnEnum.ItemA" >
至
<Trigger Property="MenuItem.Header" Value="{x:Static enums:AnEnum.ItemA}" >
< 不要枚举AnEnum会员ItemA。
in your example you check that header is equal to sting "enums:AnEnum.ItemA" not to enum AnEnum member ItemA.
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