wpf 绑定值作为 ConverterParameter
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Binding value as ConverterParameter
提问by Sasha
In my resourceDictionary I have a following style:
在我的 resourceDictionary 中，我有以下风格：
<Style TargetType="{x:Type propgrid:PropertyGridDataAccessorItem}" x:Key="{x:Type propgrid:PropertyGridDataAccessorItem}">
<Style.Triggers>
<Trigger Property="DataAccessorType" Value="Category">
<Setter Property="IsExpanded" Value="{Binding DisplayName, Converter={local:ExpandedCategoryConverter}}"/>
</Trigger>
</Style.Triggers>
</Style>
I need to bind a value from my viewModel to ConverterParameter, something like ConverterParameter = {Binding MyProperty}, but we can't bind to a ConverterParameter.
我需要将 viewModel 中的值绑定到 ConverterParameter，例如 ConverterParameter = {Binding MyProperty}，但我们无法绑定到 ConverterParameter。
How can I solve this issue?
我该如何解决这个问题？
Thnx in advance
提前谢谢
回答by Jon
As you have discovered, you cannot bind ConverterParameterbecause it's not a dependency property.
正如您所发现的，您无法绑定，ConverterParameter因为它不是依赖属性。
Most of the time the solution for this is to simply use a MultiBindingand a multi value converterinstead, for example:
大多数情况下，解决方案是简单地使用 aMultiBinding和多值转换器，例如：
<Trigger Property="DataAccessorType" Value="Category">
<Setter Property="IsExpanded">
<Setter.Value>
<MultiBinding Converter="{local:ExpandedCategoryConverter}">
<Binding Path="DisplayName"/>
<Binding Path="WhatYouWantToPassInAsConverterParameter"/>
</MultiBinding>
</Setter.Value>
</Setter>
</Trigger>
The converter would of course need to be updated appropriately.
转换器当然需要适当更新。
