使用ItemsSource将预定义项添加到ComboBox [英] Adding predefined item to a ComboBox with ItemsSource

问题描述

我试图添加一个预定义的ComboBoxItem到我已经有一个ItemsSource属性设置的ComboBox。示例：

I'm trying to add a predefined ComboBoxItem into my ComboBox which already has a ItemsSource property set. example:

(Select item)
Item 1
Item 2
Item 3

可以在不修改原始项目集合的情况下这样做？

It's possible to do this without modifying the original items collection?

推荐答案

下面是来自MSDN的一些示例代码，显示了CompositeCollection的用法：

Here is some sample code from MSDN that shows the usage of CompositeCollection:

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

以下是一些参考资料，显示了CompositeCollection的用法：

Here are some references to show you the usage of CompositeCollection:

1- http：// msdn .microsoft.com / en-us / library / system.windows.data.compositecollection.aspx

2- http://robertbouillon.com/2010/04/17/adding-items -to-a-data-bound-wpf-combobox /

3- 如何转换ComboBox以使用绑定的CompositeCollection？

这篇关于使用ItemsSource将预定义项添加到ComboBox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！