主要是要设置HorizontalContentAlignment的值,而不是HorizontalAlignment
<ListBox x:Name="xxx"><ListBox.ItemContainerStyle><Style TargetType="ListBoxItem"><Setter Property="HorizontalContentAlignment" Value="Stretch"/></Style></ListBox.ItemContainerStyle><ListBox.ItemTemplate><DataTemplate><StackPanel><Grid><TextBlock Text="www.tech-" HorizontalAlignment="Left"/><TextBlock Text="维思实验室" HorizontalAlignment="Right"/></Grid></StackPanel></DataTemplate></ListBox.ItemTemplate></ListBox>
@thl 2月14日 13:55:24