后台代码：

namespace MyWpf
{
    /// <summary>
    /// DataTemplateTest.xaml 的交互逻辑
    /// </summary>
    public partial class DataTemplateTest : UserControl
    {
        public DataTemplateTest()
        {
            InitializeComponent();
            List<Student> students = new List<Student>() { new Student() { Name = "张三", Sex = "男" },
            new Student() { Name = "李四", Sex = "男" } };
           // this.DataContext = students;
            combox.ItemsSource = students;
        }
    }

    public class Student
    {
        public string Name { get; set; }
        public string Sex { get; set; }
    }
}

 xaml：

<UserControl x:Class="MyWpf.DataTemplateTest"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:MyWpf"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="500">
    <Grid>
        <ComboBox x:Name="combox"  Height="60" Width="200"  >
            <!--ItemTemplate：combox中每一项的数据模板-->
            <ComboBox.ItemTemplate>
                <!--数据模板-->
                <DataTemplate>
                    <!--放置一个StackPanel布局面板控件-->
                    <StackPanel Orientation="Horizontal">
                        <TextBlock  Text="{Binding Name}"></TextBlock>
                        <TextBlock  Text="--"></TextBlock>
                        <TextBlock  Text="{Binding Sex}"></TextBlock>
                    </StackPanel>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
    </Grid>
</UserControl>

显示：