当数据可用时，Comboxbox 自动选择第一项 [英] Comboxbox auto select first item when data is available

问题描述

我正在寻找在数据可用时选择第一项的方法.但是如果源中没有数据，则不要选择.怎么做 ?我对 WPF 很陌生.

I am looking for way to select the first item when data became available. But if no data in the source , then do not select. How to do it ? I am very new to WPF.

<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>

推荐答案

最简单的方法是使用 SelectedIndex.请检查下面的代码.

The easiest way is to use SelectedIndex. Please, check the code below.

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

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