WindowsPhone8中的UserControl绑定MVVM

本文关键字:MVVM 绑定 UserControl 中的 WindowsPhone8 | 更新日期: 2023-09-27 18:00:21

我有一个带有文本框的简单用户控件

XAML:

<UserControl x:Name="myTextBox" x:Class="Views.UserControls.myTextBox"
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"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}" d:DesignWidth="480" Height="92">
<StackPanel>
    <StackPanel Margin="25,0,0,0" Orientation="Horizontal">
        <TextBlock TextWrapping="Wrap" Text="Title" FontSize="16" HorizontalAlignment="Left"/>
    </StackPanel>
    <TextBox x:Name="textbox" TextWrapping="Wrap" Text="{Binding Text, Mode=TwoWay}" VerticalAlignment="Top"/>
</StackPanel>

代码背后:

public partial class LabeledTextBox : UserControl
{
    public LabeledTextBox()
    {
        InitializeComponent();
        DataContext = this;
    }
    public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(String), typeof(LabeledTextBox), new PropertyMetadata(default(String)));

    public String Text
    {
        get { return (String)GetValue(TextProperty); }
        set { SetValue(TextProperty, value); }
    }
}

}

还有一页:

<phone:PhoneApplicationPage
[...]
>
<phone:PhoneApplicationPage.DataContext>
    <viewmodel:myViewModel/>
</phone:PhoneApplicationPage.DataContext>
<StackPannel>
    <TextBlock Text="{Binding Text, ElementName=myusertextbox}"/>
    <usercontrols:myTextBox x:Name="myusertextbox" Text="{Binding myText, Mode=TwoWay}"/>
</StackPannel>

在我的视图模型中:

private String mytext;
public String myText
{
   get { return myText; }
   set { NotifyPropertyChanged(ref myText, value); }
}

文本块是一个很好的值,我可以让文本做这样的事情:myusertextbox。文本

但我想用用户控件中文本框的值自动设置myText。

我试了一整天,但还是没用。。。

我错过了什么?提前谢谢。

编辑:

public abstract class ANotifyPropertyChanged : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    public void NotifyPropertyChanged(string nomPropriete)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(nomPropriete));
    }
    public bool NotifyPropertyChanged<T>(ref T variable, T valeur, [CallerMemberName] string nomPropriete = null)
    {
        if (object.Equals(variable, valeur))
            return false;
        variable = valeur;
        NotifyPropertyChanged(nomPropriete);
        return true;
    }
}

WindowsPhone8中的UserControl绑定MVVM

private String mytext;
public String myText
{
   get { return myText; }
   set { NotifyPropertyChanged(ref myText, value); }
}

您使用什么样的框架来实现INotifyPropertyChanged接口?您甚至没有在此处设置您的私人字段的值。这在我看来很奇怪。它似乎没有遵循get-set-notify的路线。

它被认为是类似于:

private String mytext;
public String myText
{
   get { return myText; }
   set 
 { 
   mytext = value;
   NotifyPropertyChanged("myText"); 
 }
}