您的控件可以公开自己的属性，您可以在代码隐藏中声明这些属性。
如果您需要单个DataTemplate，则可以公开DataTemplate 类型的属性。当用户在 XAML 中声明您的控件类型时，她可以提供模板：
<ns:YourControl>
<ns:YourControl.DataTemplate>
<DataTemplate>
…
</DataTemplate>
</ns:YourControl.DataTemplate>
</ns:YourControl>
在您自己的控件中，您可以通过绑定到DataTemplate 属性来使用它。请务必在您的Binding 中引用控件本身，而不是DataContext。如果用户未指定DataTemplate，您可能需要默认的DataTemplate 或抛出有用的Exception。
如果您公开 DataTemplateSelector 类型的属性，然后将其应用于您的项目，如果数据类型不同或用户可能在不同情况下需要不同的模板，您可以为用户提供一些额外的灵活性。
示例
MyControl.xaml
<UserControl x:Class="MyNamespace.MyControl"
x:Name="ThisControl">
<ItemsControl ItemTemplate="{Binding ItemTemplate, ElementName=ThisControl}" />
</UserControl>
MyControl.xaml.cs
public partial class MyControl : UserControl
{
public MyControl()
{
InitializeComponent();
}
public static readonly DependencyProperty ItemTemplateProperty
= DependencyProperty.Register("ItemTemplate", typeof (DataTemplate),
typeof (MyControl), new PropertyMetadata(default(DataTemplate)));
public DataTemplate ItemTemplate
{
get { return (DataTemplate) GetValue(ItemTemplateProperty); }
set { SetValue(ItemTemplateProperty, value); }
}
// Other dependency properties (ItemsSource, SelectedItem, etc.)
}
消费者：
<Grid>
<ns:MyControl ItemsSource="{Binding Items}"
SelectedItem="{Binding SelectedItem}">
<ns:MyControl.ItemTemplate>
<DataTemplate>
<Border BorderThickness="2"
BorderBrush="Black">
<TextBlock Foreground="DarkGray"
Text="{Binding Name}"
Margin="4" />
</Border>
</DataTemplate>
</ns:MyControl.ItemTemplate>
</ns:MyControl>
</Grid>
更新
好的，这是填充Grid 和使用DataTemplate 的工作示例。
MyControl 公开了一个属性ItemsSource，它允许消费者绑定到她的视图模型中的集合。 MyControl 还公开了一个属性 ItemTemplate，它允许消费者指定如何显示这些项目（同样，您也可以允许用户指定 DataTemplateSelector）。
在代码隐藏中，当源集合发生变化时，我们
- 为每个项目创建一个
ColumnDefinition，
- 将每个项目包装在另一个公开
Row 和 Column 属性的类中，并且
- 将每个包装的项目添加到私有集合中，这是我们在控件中实际绑定的。
首先，XAML：
<UserControl x:Class="WpfApplication1.MyControl"
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"
mc:Ignorable="d"
x:Name="ThisControl"
d:DesignHeight="300" d:DesignWidth="300">
<ItemsControl x:Name="ItemsControl"
ItemsSource="{Binding BindableItems, ElementName=ThisControl, Mode=OneWay}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Grid IsItemsHost="True" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemContainerStyle>
<Style TargetType="{x:Type ContentPresenter}">
<Setter Property="Grid.Row" Value="{Binding Row}" />
<Setter Property="Grid.Column" Value="{Binding Column}" />
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<ContentPresenter Content="{Binding Content}"
ContentTemplate="{Binding ItemTemplate, ElementName=ThisControl}" />
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</ItemsControl.ItemContainerStyle>
</ItemsControl>
</UserControl>
还有代码隐藏：
using System.Collections;
using System.Collections.ObjectModel;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
namespace WpfApplication1
{
public partial class MyControl : UserControl
{
public MyControl()
{
InitializeComponent();
}
public static readonly DependencyProperty ItemsSourceProperty = DependencyProperty.Register(
"ItemsSource", typeof (IEnumerable), typeof (MyControl),
new PropertyMetadata(default(IEnumerable), OnItemsSourceChanged));
public IEnumerable ItemsSource
{
get { return (IEnumerable) GetValue(ItemsSourceProperty); }
set { SetValue(ItemsSourceProperty, value); }
}
// This is the DataTemplate that the consumer of your control specifies
public static readonly DependencyProperty ItemTemplateProperty = DependencyProperty.Register(
"ItemTemplate", typeof (DataTemplate), typeof (MyControl), new PropertyMetadata(default(DataTemplate)));
public DataTemplate ItemTemplate
{
get { return (DataTemplate) GetValue(ItemTemplateProperty); }
set { SetValue(ItemTemplateProperty, value); }
}
// This is declared private, because it is only to be consumed by this control
private static readonly DependencyProperty BindableItemsProperty = DependencyProperty.Register(
"BindableItems", typeof (ObservableCollection<object>), typeof (MyControl), new PropertyMetadata(new ObservableCollection<object>()));
private ObservableCollection<object> BindableItems
{
get { return (ObservableCollection<object>) GetValue(BindableItemsProperty); }
set { SetValue(BindableItemsProperty, value); }
}
private static void OnItemsSourceChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
{
var myControl = dependencyObject as MyControl;
if (myControl == null)
{
return;
}
// Get reference to the Grid using reflection. You could also walk the tree.
var grid = (Grid) typeof (ItemsControl).InvokeMember("ItemsHost",
BindingFlags.NonPublic | BindingFlags.GetProperty | BindingFlags.Instance,
null, myControl.ItemsControl, null);
var columns = grid.ColumnDefinitions;
columns.Clear();
myControl.BindableItems.Clear();
var items = args.NewValue as IEnumerable;
if (items != null)
{
var columnIndex = 0;
foreach (var item in items)
{
columns.Add(new ColumnDefinition{ Width = GridLength.Auto });
var container = new MyItem
{
Row = columnIndex,
Column = columnIndex++,
Content = item
};
myControl.BindableItems.Add(container);
}
}
}
}
public class MyItem
{
public object Content { get; set; }
public int Row { get; set; }
public int Column { get; set; }
}
}