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

问题描述

您好我有一个WPF组合框，显示枚举的列表。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"/> 

不过，鉴于被加载时，它显示在列表中的第一个枚举，但我想它显示请选择'，所以有XAML做到这一点（C＃中的视图如果需要的话..）

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..)

感谢

推荐答案

这已提供的所有很好的答案，但我用以下解决我的问题。

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>

感谢大家谁帮助！

Thanks for everyone who has helped!

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