WPF 组合框默认值(请选择) [英] WPF Combobox DefaultValue (Please Select)

问题描述

我有一个 WPF 组合框，它显示了枚举列表.代码如下.

Hi I have a WPF Combobox which shows a list of Enums. Code is below.

    <ComboBox HorizontalAlignment="Left" 
              Margin="139,299,0,0" 
              VerticalAlignment="Top" 
              ItemsSource="{Binding Source={StaticResource Enum}}"
              Width="78"/> 

但是，当视图加载时，它显示列表中的第一个枚举，但我希望它显示请选择"，所以是否有 XAML 来执行此操作(如果需要，视图中的 C# ..)

However, when the view is loaded, it shows the first enum in the list, but I would like it to show 'Please Select', so is there XAML to do this (C# in the view if needs be..)

谢谢

推荐答案

已提供所有好的答案，但我使用以下方法解决了我的问题

All good answers that has been supplied, but I used the following to solve my problem

<ComboBox SelectedIndex="0">
    <ComboBox.ItemsSource>
        <CompositeCollection>
            <ListBoxItem>Please Select</ListBoxItem>
            <CollectionContainer Collection="{Binding Source={StaticResource YOURDATASOURCE}}" />
        </CompositeCollection>
    </ComboBox.ItemsSource>
</ComboBox>

感谢所有帮助过的人！

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