Question

是否有人知道如何将我的属性（在ViewModel中）与我的依赖属性同步，这些属性在视图中？

我正在尝试创建一个UserControl，然后由WPF-Window（MainWindow.xaml）托管。 UserControl有一个自己的ViewModel，它包含ICommands和属性。

问题是，我还必须将某些属性返回到MainWindow（.xaml）并设置它们。

目前我的课程看起来像这样：

MainWindow.xaml

<TextBox Name="tbInput" VerticalAlignment="Top" HorizontalAlignment="Stretch" Grid.Row="0"></TextBox>
    <local:View x:Name="appEntryView" Pfad="{Binding ElementName=tbInput, Path=Text}" Grid.Row="1" Margin="10"/>

View.xaml

<UserControl x:Class="DependencyProperties.Test"
         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" 
         xmlns:local="clr-namespace:DependencyProperties_Intro"
         x:Name="obj"
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">

<Grid>
    <TextBlock Text="{Binding ElementName=obj, Path=Pfad}"/>
</Grid>

View.xaml.cs

public partial class View: UserControl, INotifyPropertyChanged
{

    public String Pfad
    {
        get { return (String)GetValue(PfadProperty); }
        set { SetValue(PfadProperty, value); OnNotifyPropertyChanged("Pfad"); }
    }

    // Using a DependencyProperty as the backing store for Path.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty PfadProperty =
        DependencyProperty.Register("Pfad", typeof(String), typeof(GraphSharpTest), new PropertyMetadata(default(string)));

    public View()
    {
        InitializeComponent();
        this.DataContext = new ViewModel();
        var name = "Pfad";
        var binding = new Binding(name) { Mode = BindingMode.TwoWay };
        this.SetBinding(PfadProperty, binding);
    }
}

ViewModel.cs

public class ViewModel: INotifyPropertyChanged
{
    private String m_Pfad;

    public String Pfad
    {
        get { return m_Pfad; }
        set { m_Pfad = value; OnNotifyPropertyChanged("Pfad"); }
    }


    public void OnNotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(info));
    }

    public event PropertyChangedEventHandler PropertyChanged;
}

依赖属性工作正常，但ViewModel中的“Pfad”的setter方法根本不会被调用。

提前致谢！

将依赖项属性（视图）与属性同步（ViewModel）

0 个答案: