在用户控件上设置绑定到主窗口的ViewModel

debugcn 发表于 Dev

夜行者

我有以下用户控制

<UserControl x:Class="Station.Controls.FilterTraceDataControl"
             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">
            <TextBox x:Name="PartNumbTextBox" Width="120" VerticalAlignment="Bottom" HorizontalAlignment="Left" Margin="5,0,0,0" Height="25"/>
</UserControl>

我在主窗口中使用它：

<Window
        xmlns:controls="clr-namespace:Station.Controls"
        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"


        mc:Ignorable="d" 
        x:Class="Station.MainWindow"
        Title="{Binding ApplicationTitle}" MinHeight="550" MinWidth="850" Height="650" Width="900"
        DataContext="{Binding Main, Source={StaticResource Locator}}">

        <controls:FilterTraceDataControl  Grid.Row="1" Visibility="{Binding FilterBarVisible ,Converter={StaticResource BooleanToVisibilityConverter}, Mode=TwoWay}"/>

</Window>

Window的Mainview具有以下属性：

public string SelectedRefDesFilter
{
    get { return _selectedRefDesFilter; }
    set
    {
        _selectedRefDesFilter = value;
        RaisePropertyChanged("SelectedRefDesFilter");

    }
}

如何将“ PartNumbTextBox”从UserControl数据绑定到此属性。

谢谢。

阿尔穆洛

在您的UserControl的代码隐藏（FilterTraceDataControl.xaml.cs）上，添加一个DependencyProperty，如下所示：

public string Text
{
    get { return (string)this.GetValue(TextProperty); }
    set { this.SetValue(TextProperty, value); } 
}

public static readonly DependencyProperty TextProperty = DependencyProperty.Register(
    "Text", typeof(string), typeof(FilterTraceDataControl),new PropertyMetadata(null));

然后通过RelativeSource或ElementName将UserControl的TextBox绑定到它：

<TextBox x:Name="PartNumbTextBox" Width="120" VerticalAlignment="Bottom" HorizontalAlignment="Left" Margin="5,0,0,0" Height="25"
         Text="{Binding Text, RelativeSource={RelativeSource AncestorType={x:Type controls:FilterTraceDataControl}}}" />

在您看来，只需将此新的Text属性绑定到您现有的SelectedRefDesFilter属性即可。

<controls:FilterTraceDataControl Grid.Row="1" Visibility="{Binding FilterBarVisible ,Converter={StaticResource BooleanToVisibilityConverter}, Mode=TwoWay}"
                                 Text="{Binding SelectedRefDesFilter, Mode=TwoWay}" />

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