选择组合框项时启用文本框 [英] Enable text box when combobox item is selected

问题描述

我想在选择 comboboxitem 时启用文本框.请注意组合框项目未定义，而是我在组合框中使用项目源来获取组合框项目列表.我想在选择组合框项目时更改文本框的属性.

I want to enable the text box when comboboxitem is selected . note the combobox item is not defined but rather i have used item source in combox to get the list of combo box items.i want to change the property of a text box when the combox item is selected .

(评论粘贴到原始问题)

(Comment pasted to original question)

<DataTrigger Binding="{Binding ElementName=cmbInstrumentType,
              Path=SelectedIndex}" 
              Value="1" >
    <Setter Property="IsEnabled" Value="true" />
    <Setter Property="Background" Value="White" /> 
 </DataTrigger>

我只希望它在 XAML 中，而不是在后面的代码中.我不想为每个索引值重复这一点 -

I want it in XAML only not in code behind. I dont want to repeat that for every index value –

推荐答案

尽管 更好 的方法是使用 MVVM 模式并绑定到 ViewModel 中的属性(如 Dabblenl 建议的那样)，我想你可以像这样实现你想要的:

Although the better way to do this is to use the MVVM pattern and bind to a property in your ViewModel (as Dabblenl suggested), I think you can achieve what you want like this:

    <StackPanel>
        <ComboBox ItemsSource="{Binding Items}" Name="cmbInstrumentType"/>
        <TextBox>
            <TextBox.Style>
                <Style TargetType="TextBox">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding ElementName=cmbInstrumentType, Path=SelectedItem}" Value="{x:Null}">
                            <Setter Property="IsEnabled" Value="False"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </TextBox.Style>
        </TextBox>
    </StackPanel>

如果在组合框中没有选择任何项目，这将禁用文本框.

This will disable the textbox if no item is selected in the combobox.

扩展的代码片段

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