绑定converterParameter值 [英] Binding a converterParameter value

问题描述

大家好，

我有以下xaml代码，我试图绑定converterParameter值：

Hi all,
I have following xaml code where I am trying to bind converterParameter value:

<Window.Resources>
    <ResourceDictionary>
        <local:ExpandedCategoryConverter x:Key="ExpandConverter"/>
        <Style TargetType="{x:Type propgrid:PropertyGridDataAccessorItem}">
            <Style.Triggers>
                <Trigger Property="DataAccessorType" Value="Category">
                    <Setter Property="IsExpanded">
                        <Setter.Value>
                            <MultiBinding Converter="{StaticResource ExpandConverter}">
                                <Binding Path="DisplayName"/>
                                <Binding Path="ExpandCategory"/>
                            </MultiBinding>
                        </Setter.Value>
                    </Setter>
                </Trigger>
            </Style.Triggers>
        </Style>  
    </ResourceDictionary>
</Window.Resources>

问题是我想绑定ExpandCategory不是来自 TargetType ={x：Type propgrid：PropertyGridDataAccessorItem}，而是来自我的viewModel。

我该怎么做？

Thnx提前

The problem is that I want to bind ExpandCategory not from TargetType="{x:Type propgrid:PropertyGridDataAccessorItem}", but from my viewModel.
How can I do that?
Thnx in advance

推荐答案

解决方案非常简单 - 我只是在Mode = FindAncestor中将RelativeSource添加到我的绑定中。

代码现在看起来如此：

The solution was very simple - I just added RelativeSource to my binding in Mode = FindAncestor.
Code looks now so:

<window.resources>
    <resourcedictionary>
        <style targettype="{x:Type propgrid:PropertyGridDataAccessorItem}">
            <style.triggers>
                <trigger property="DataAccessorType" value="Category">
                    <setter property="IsExpanded">
                        <setter.value>
                            <multibinding>
                                <multibinding.converter>
                                    <local:expandedcategoryconverter  />
                                </multibinding.converter>
                                <binding path="DisplayName" relativesource="{RelativeSource Self}" />
                                <binding path="ViewModel" relativesource="{RelativeSource Mode=FindAncestor, AncestorType=Window}" />
                            </multibinding>
                        </setter.value>
                    </setter>
                </trigger>
            </style.triggers>
        </style>  
    </resourcedictionary>
</window.resources>

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