如何在XAML中使用选定的值制作简单的组合框？

Question

在纯XAML中选择具有值(而不是索引)的组合框项目的正确语法是什么？

不起作用:

<StackPanel>
    <ComboBox SelectedValue="CA">
        <ComboBoxItem Tag="CO">Colorado</ComboBoxItem>
        <ComboBoxItem Tag="CA">California</ComboBoxItem>
        <ComboBoxItem Tag="NM">New Mexico</ComboBoxItem>
    </ComboBox>
</StackPanel>

不起作用:

<StackPanel>
    <ComboBox SelectedValue="CA">
        <ComboBoxItem Value="CO">Colorado</ComboBoxItem>
        <ComboBoxItem Value="CA">California</ComboBoxItem>
        <ComboBoxItem Value="NM">New Mexico</ComboBoxItem>
    </ComboBox>
</StackPanel>

即便这样也行不通:

<ComboBox SelectedValue="Colorado">
    <ComboBoxItem Tag="CO">Colorado</ComboBoxItem>
    <ComboBoxItem Tag="CA">California</ComboBoxItem>
    <ComboBoxItem Tag="NM">New Mexico</ComboBoxItem>
</ComboBox>

这不起作用:

<StackPanel>
    <ComboBox SelectedItem="CA">
        <ComboBoxItem Tag="CO">Colorado</ComboBoxItem>
        <ComboBoxItem Tag="CA">California</ComboBoxItem>
        <ComboBoxItem Tag="NM">New Mexico</ComboBoxItem>
    </ComboBox>
</StackPanel>

Answer 1

我认为这应该有效.试试.

<StackPanel>
    <ComboBox>
        <ComboBoxItem Tag="CO">Colorado</ComboBoxItem>
        <ComboBoxItem Tag="CA" IsSelected="True">California</ComboBoxItem>
        <ComboBoxItem Tag="NM">New Mexico</ComboBoxItem>
    </ComboBox>
</StackPanel>

Answer 2

<ComboBox SelectedValuePath="Content" SelectedValue="{Binding Source="...", Path="..."}">
   <ComboBoxItem Content="..." isSelected="true"/>
   <ComboBoxItem Content="..." />
   <ComboBoxItem Content="..." />
</ComboBox>

它应该与内容,标签......或您想要绑定的任何其他属性一起使用.