WPF显示/隐藏带有触发器的控件 [英] WPF Showing / Hiding a control with triggers

问题描述

我是WPF的新手，我试图创建xaml逻辑来基于ViewModel上的AllowMiscTitle的值来显示/隐藏控件。 xaml由两个字段组成，当选择其他时，我希望文本框显示标准瓷砖的组合框（先生，夫人，...，其他）。

I'm new to WPF and I trying to create xaml logic to show / hide a control based on the value of the AllowMiscTitle on the ViewModel. The xaml consist of two fields a combobox of the standard tiles ("Mr", "Mrs", ..., "Other") when "Other" is selected I want the textbox to display.

我创建了以下xaml：

I've created the follow xaml:

                <DockPanel Validation.Error="Validation_Error" HorizontalAlignment="Stretch">
                <ComboBox ItemsSource="{Binding Path=Titles, Mode=OneTime}" 
                      Text="{Binding Path=Title}"/>
                <TextBox x:Name="TxtBxTitle" Margin="5,5" Visibility="Visible">
                    <TextBox.Style>
                        <Style>
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding Path=AllowMiscTitle}" Value="false">
                                    <Setter Property="TextBox.Visibility" Value="Hidden"/>
                                </DataTrigger>
                            </Style.Triggers>
                        </Style>
                    </TextBox.Style>
                </TextBox>

            </DockPanel>

推荐答案

该触发不起作用，因为您已在 TextBox

That Trigger won't work because you have set Visibility property explicitly in TextBox

这样做：

<TextBox x:Name="TxtBxTitle" Margin="5,5">
    <TextBox.Style>
        <Style>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=AllowMiscTitle}" Value="false">
                      <Setter Property="TextBox.Visibility" Value="Hidden"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBox.Style>
</TextBox>

原因是相关性属性值优先级。

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