“WPF XAML”组合框宽度

我无法重现你所描述的行为。我做了以下测试:

<Window x:Class="ComboWidthSample.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Grid>
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" Height="20">
            <ComboBox ItemsSource="{Binding}" Width="30" />
            <ComboBox ItemsSource="{Binding}" Width="50" />
            <ComboBox ItemsSource="{Binding}" Width="200" />
        </StackPanel>
    </Grid>
</Window>

using System.Linq;

namespace ComboWidthSample
{
    public partial class Window1
    {
        public Window1()
        {
            InitializeComponent();
            DataContext = Enumerable.Range(1, 10).Select(i => "My ComboBox Item " + i).ToList();
        }
    }
}

你在做什么不同的事情吗?也许是数据绑定到width属性,或者设计组合框的样式?