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请让我知道我做错了什么

XAMLUserControl我在哪里使用我的孩子UserControl的依赖属性

ComboBoxSelectedItem将更新SelectedEmployee，

这SelectedEmployee进一步与我的子控件CardView:uEmployeeCardViewModel 属性绑定

<ComboBox  Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2"
           Style="{StaticResource UiComboBox}"
           ItemsSource="{Binding TB_EMPLOYEEList}"
           SelectedItem="{Binding SelectedEmployee,
                          Mode=TwoWay,
                          UpdateSourceTrigger=PropertyChanged}"
           SelectedValuePath="ID"
           SelectedValue="{Binding CurrentTB_RECIEPT.REFRENCEID}"
           ItemTemplate="{StaticResource ComboEmployeeTemplate}"/>

<CardView:uEmployeeCard  ViewModel="{Binding Path=SelectedEmployee}"
                         Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" 
                         Grid.RowSpan="3" VerticalAlignment="Top"/>

依赖属性代码，uEmployeeCard文件后面的代码：

public  uEmployeeCard()
{
    InitializeComponent();
    this.DataContext = this;
}

public static readonly DependencyProperty ViewModelProperty = 
    DependencyProperty.Register("ViewModel",
        typeof(TB_EMPLOYEE),
        typeof(uEmployeeCard), new FrameworkPropertyMetadata
            {
                BindsTwoWayByDefault = true,
                DefaultUpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
            });

[Bindable(true)]
public  TB_EMPLOYEE ViewModel
{
    get { return (TB_EMPLOYEE)GetValue(ViewModelProperty); } //do NOT modify anything in here
    set { SetValue(ViewModelProperty, value);  } //...or here
}

uEmployeeCard 的 Xaml 文件（儿童用户控制）：

<StackPanel Grid.Column="0" Grid.Row="0" Orientation="Horizontal">
    <TextBlock Style="{StaticResource UiTextBlock}"
               Text="{Binding Path=ViewModel.TITLE}"/>
    <TextBlock Style="{StaticResource UiTextBlock}"
               Text="{Binding Path=ViewModel.FIRSTNAME}"/>
    <TextBlock Style="{StaticResource UiTextBlock}"
               Text="{Binding Path=ViewModel.FIRSTNAME}"/>
</StackPanel>
<StackPanel Grid.Column="0" Grid.Row="1" Orientation="Vertical" Grid.RowSpan="2">
    <TextBlock Style="{StaticResource UiTextBlock}"
               Text="{Binding Path=ViewModel.NATNO}"/>
</StackPanel>

我设置了断点来检查依赖属性是否在父用户控件上的 ComboBox 更新时受到影响。但不是...

4

1 回答 1

1

您是否已经尝试使用以下内容进行PropertyBinding编辑ChildControl：

"Mode=TwoWay, UpdateSourceTrigger=PropertyChanged"

你也可以尝试给你ComboBox一个名字并将你绑定ChildControl到它：

ViewModel="{Binding ElementName=NamedComboBox, Path=SelectedItem}"
于 2013-10-01T11:24:42.460 回答