如何使用EventToCommand与可编辑的Combobox绑定TextBoxBase.TextChanged与命令？ [英] How to use an EventToCommand with an editable Combobox to bind TextBoxBase.TextChanged with a command?

问题描述

我有一个可编辑的ComboBox。

I have an editable ComboBox.

<ComboBox IsEditable="True">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="SelectionChanged">
            <cmd:EventToCommand Command="{Binding CritereChangedCommand, Mode=OneWay}"/>
        </i:EventTrigger>
        <i:EventTrigger EventName="TextBoxBase.TextChanged">
            <cmd:EventToCommand Command="{Binding CritereChangedCommand, Mode=OneWay}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</ComboBox>

我使用GalaSoft.MvvmLight.Command.EventToCommand绑定SelectionChanged事件。

我也想绑定TextChanged事件，但它有点棘手：
此事件只能通过ComboBox TextBoxBase属性访问，我找不到正确的方式绑定此事件。 >
您可以看到我的一个失败的尝试：SelectionChanged绑定工作正常，但TextChanged绑定不。

I use GalaSoft.MvvmLight.Command.EventToCommand to bind the SelectionChanged event.
I also would like to bind the TextChanged event, but it is a little bit tricky: This event is only accessible by the ComboBox TextBoxBase property, and I can't find the proper way to bind this event.
You can see one of my unsuccessful attempt: SelectionChanged binding works fine, but TextChanged binding does not.

我也尝试过这种语法：

<ComboBox IsEditable="True">
    <TextBoxBase>
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="TextChanged">
                <cmd:EventToCommand Command="{Binding CritereChangedCommand, Mode=OneWay}" />
            </i:EventTrigger>
        </i:Interaction.Triggers>
    </TextBoxBase>
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="SelectionChanged">
            <cmd:EventToCommand Command="{Binding CritereChangedCommand, Mode=OneWay}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</ComboBox>

但这不会编译。我在TextBoxBase标签上得到一个错误可以实例化的类型。

But this won't even compile. I get an error "Type that can be instantiated expected" on the TextBoxBase tag.

任何想法？

推荐答案

我找到了解决这个问题的方法：

我创建一个不可见的TextBox，绑定到ComboBox，并绑定到TextChanged事件的命令文本框。
它不漂亮，但它工作...

I have found a way to work around the problem:
I create an invisible TextBox, bound to the ComboBox, and I bind the command on the TextChanged event of the TextBox. It's not pretty, but it works...

<ComboBox Name="CbRubrique" IsEditable="True">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="SelectionChanged">
            <cmd:EventToCommand Command="{Binding CritereChangedCommand, Mode=OneWay}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</ComboBox>
<TextBox Text="{Binding ElementName=CbRubrique, Path=Text, UpdateSourceTrigger=PropertyChanged}" Visibility="Collapsed">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="TextChanged">
            <cmd:EventToCommand Command="{Binding CritereChangedCommand, Mode=OneWay}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</TextBox>

这篇关于如何使用EventToCommand与可编辑的Combobox绑定TextBoxBase.TextChanged与命令？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！