小编Tim*_*ler的帖子

我正在尝试从XAML设置同一usercontrol的几个实例的fill属性,以便区分它们.我在控件的C#代码隐藏中使用依赖属性,并在实例化控件时引用XAML中的依赖属性.这是我尝试过的简化示例,首先是用户控件的XAML:

<UserControl x:Class="RectangleFillUserControlTest.RectangleFillTest"
             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" 
             d:DesignHeight="50" d:DesignWidth="150">
    <Grid>
        <Rectangle x:Name="rect" HorizontalAlignment="Left" Height="50" Stroke="Black" VerticalAlignment="Top" Width="150"/>
    </Grid>
</UserControl>

现在代码隐藏:

namespace RectangleFillUserControlTest
{
    public partial class RectangleFillTest : UserControl
    {
        SolidColorBrush fillBrush;

        public static readonly DependencyProperty FillColourProperty = DependencyProperty.Register
            ("FillColour", typeof(string), typeof(RectangleFillTest), new PropertyMetadata(string.Empty));

        public string FillColour
        {
            get { return (string)GetValue(FillColourProperty); }

            set
            {
                SetValue(FillColourProperty, value);
                if (value == "red") fillBrush = new SolidColorBrush(Colors.Red);
                else fillBrush = new SolidColorBrush(Colors.Green);
                rect.Fill = fillBrush;
            }
        }

        public RectangleFillTest()
        {
            InitializeComponent(); …

这是一个展示我遇到问题的行为的示例。我有一个数据网格，它绑定到视图模型中的可观察记录集合。在数据网格中，我有一个 DataGridTemplateColumn 包含一个组合框，该组合框是从视图模型中的列表填充的。数据网格还包含文本列。窗口底部有一些文本框来显示记录内容​​。

<Window x:Class="Customer.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:Customer"
    Title="MainWindow" Height="350" Width="525">

    <Window.Resources>
        <local:SelectedRowConverter x:Key="selectedRowConverter"/>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="8*"/>
            <RowDefinition Height="3*"/>
        </Grid.RowDefinitions>
        <DataGrid x:Name="dgCustomers" AutoGenerateColumns="False"
                  ItemsSource="{Binding customers}" SelectedItem="{Binding SelectedRow,
                    Converter={StaticResource selectedRowConverter}, Mode=TwoWay}"
                  CanUserAddRows="True" Grid.Row="0" >
            <DataGrid.Columns>
                <DataGridTemplateColumn Width="Auto" Header="Country">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox x:Name="cmbCountry" ItemsSource="{Binding DataContext.countries,
                                RelativeSource={RelativeSource AncestorType={x:Type Window}}}"
                                      DisplayMemberPath="name" SelectedValuePath="name" Margin="5"
                                      SelectedItem="{Binding DataContext.SelectedCountry,
                                RelativeSource={RelativeSource AncestorType={x:Type Window}}, Mode=TwoWay,
                                UpdateSourceTrigger=PropertyChanged}" SelectionChanged="cmbCountry_SelectionChanged" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTextColumn Header="Name" Binding="{Binding name}" Width="1*"/>
                <DataGridTextColumn Header="Phone" Binding="{Binding phone}" Width="1*"/>
            </DataGrid.Columns>
        </DataGrid>

        <Grid x:Name="grdDisplay" DataContext="{Binding ElementName=dgCustomers}" Grid.Row="1"> …