当数据可用时,Comboxbox会自动选择第一项

Question

我正在寻找在数据可用时选择第一项的方法.但如果源中没有数据,则不要选择.怎么做 ？我是WPF的新手.

<ComboBox Grid.Row="5" Grid.Column="1"
          IsEditable="False"
          ItemsSource="{Binding Source={x:Static l:DirectXResolution.Resolutions}}"
          ToolTip="Resolutions">
    <ComboBox.Resources>
        <l:ResolutionConverter x:Key="resolutionConverter"/>
    </ComboBox.Resources>
    <ComboBox.Text>
        <MultiBinding Converter="{StaticResource resolutionConverter}">
            <Binding Path="GameWidth" Mode="OneWayToSource"/>
            <Binding Path="GameHeight" Mode="OneWayToSource"/>
        </MultiBinding>
    </ComboBox.Text>
</ComboBox>

Answer 1

最简单的方法是使用SelectedIndex.请检查下面的代码.

<ComboBox Grid.Row="5" Grid.Column="1"
          IsEditable="False"
          ItemsSource="{Binding Source={x:Static l:DirectXResolution.Resolutions}}"
          ToolTip="Resolutions"
          SelectedIndex="0">
....