“网格版”的答案：
（参见下面的列表版本）
由于问题已经改变（澄清），我正在添加一个新答案。第一个对于那些只想要列表的人仍然有用，所以我会把它留在那里。
要对网格做类似的事情，您不要公开模板因为数据网格列没有模板化（它们是控件列表，可以单独模板化）。
相反，您将左侧网格和右侧网格列集合作为属性公开，并且只需在父页面中设置控件的 LeftColumns 和 RightColumns 属性。唯一的技巧是数据网格列集合没有设置器，因此您需要从新的属性集合更新网格集合项：
代码隐藏现在是：
using System.Collections.ObjectModel;
using System.Windows.Controls;
namespace SilverlightApplication1
{
public partial class GridSelectionControl : UserControl
{
public GridSelectionControl()
{
InitializeComponent();
}
public ObservableCollection<DataGridColumn> LeftColumns
{
get
{
return leftDataGrid.Columns;
}
set
{
leftDataGrid.Columns.Clear();
foreach (var col in value)
{
leftDataGrid.Columns.Add(col);
}
}
}
public ObservableCollection<DataGridColumn> RightColumns
{
get
{
return rightDataGrid.Columns;
}
set
{
rightDataGrid.Columns.Clear();
foreach (var col in value)
{
rightDataGrid.Columns.Add(col);
}
}
}
}
}
控件的 Xaml 现在是：
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" x:Class="SilverlightApplication1.GridSelectionControl"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<sdk:DataGrid x:Name="leftDataGrid" Margin="10" AutoGenerateColumns="False"/>
<sdk:DataGrid x:Name="rightDataGrid" Margin="10" Grid.Column="2" AutoGenerateColumns="False"/>
<StackPanel Grid.Column="1" Orientation="Vertical">
<Button Content="Add >" Height="23" HorizontalAlignment="Left" Width="75" Margin="10" />
<Button Content="< Remove" Height="23" HorizontalAlignment="Left" Width="75" Margin="10" />
</StackPanel>
</Grid>
</UserControl>
测试页面（定义列）的 Xaml 现在是：
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:SilverlightApplication1" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
mc:Ignorable="d"
x:Class="SilverlightApplication1.TestGridSelectionControl"
d:DesignWidth="640" d:DesignHeight="480">
<Grid x:Name="LayoutRoot">
<local:GridSelectionControl x:Name="SelectionControl">
<local:GridSelectionControl.LeftColumns>
<sdk:DataGridCheckBoxColumn Header="Machine?" Binding="{Binding IsMachine}"/>
<sdk:DataGridTextColumn Header="First Name" Binding="{Binding FirstName}"/>
<sdk:DataGridTextColumn Header="Last Name" Binding="{Binding LastName}"/>
</local:GridSelectionControl.LeftColumns>
<local:GridSelectionControl.RightColumns>
<sdk:DataGridCheckBoxColumn Header="Machine?" Binding="{Binding IsMachine}"/>
<sdk:DataGridTextColumn Header="First Name" Binding="{Binding FirstName}"/>
<sdk:DataGridTextColumn Header="Last Name" Binding="{Binding LastName}"/>
</local:GridSelectionControl.RightColumns>
</local:GridSelectionControl>
</Grid>
</UserControl>
测试代码隐藏现在是：
using System.Collections.ObjectModel;
using System.Windows.Controls;
namespace SilverlightApplication1
{
public partial class TestGridSelectionControl : UserControl
{
public TestGridSelectionControl()
{
// Required to initialize variables
InitializeComponent();
SelectionControl.leftDataGrid.ItemsSource = Person.People;
SelectionControl.rightDataGrid.ItemsSource = Person.Machines;
}
public class Person
{
public string FirstName { get; set; }
public string LastName { get; set; }
public bool IsMachine { get; set; }
public Person(string firstname, string lastname, bool robot)
{
this.FirstName = firstname;
this.LastName = lastname;
this.IsMachine = robot;
}
public static ObservableCollection<Person> People = new ObservableCollection<Person>()
{
new Person("Tom", "Jones", false),
new Person("Elis", "Presley", false),
new Person("Joe", "Blogs", false)
};
public static ObservableCollection<Person> Machines = new ObservableCollection<Person>()
{
new Person("Marvin", "Android", true),
new Person("Hal", "9000", true),
new Person("B", "9", true)
};
}
}
}