好的,我知道.这已经被问了一百万次,但我还是不明白.对不起,

任务：实现最简单的依赖属性,可以在xaml中使用：

@H_502_3@<uc:MyUserControl1 MyTextProperty="{Binding Text}"/>

我认为this的回答是相当接近的.为了更好的可读性,我将所有的代码复制到这里(主要是从上面的答案).

@H_502_3@<UserControl x:Class="Test.UserControls.MyUserControl1" 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" DataContext="{Binding RelativeSource={RelativeSource Self}}"> <Grid> <!-- Text is being bound to outward representative property; Note the DataContext of the UserControl --> <TextBox Text="{Binding MyTextProperty}"/> </Grid> </UserControl>

和

@H_502_3@public partial class MyUserControl1 : UserControl { // The dependency property which will be accessible on the UserControl public static readonly DependencyProperty MyTextPropertyProperty = DependencyProperty.Register("MyTextProperty",typeof(string),typeof(MyUserControl1),new UIPropertyMetadata(String.Empty)); public string MyTextProperty { get { return (string)GetValue(MyTextPropertyProperty); } set { SetValue(MyTextPropertyProperty,value); } } public MyUserControl1() { InitializeComponent(); } }

这是我的MainWindow.xaml

@H_502_3@<Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:uc="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525"> <StackPanel Orientation="Vertical"> <uc:MyUserControl1 MyTextProperty="my text goes here"/> <Button Click="ButtonBase_OnClick" Content="click"/> </StackPanel> </Window>

到目前为止,一切都奏效.但是,我觉得这不是很有用.我需要的是

@H_502_3@<uc:MyUserControl1 MyTextProperty="{Binding Text}"/>

并且可以通过设置DataContext来更改(如通常在MVVM中所做的那样)

所以我替换上面的行,并添加我的代码如下：

@H_502_3@public partial class MainWindow : Window,INotifyPropertyChanged { public MainWindow() { InitializeComponent(); Text = "Initial Text"; DataContext = this; } private string _Text; public string Text { get { return _Text; } set { if (value != _Text) { _Text = value; NotifyPropertyChanged("Text"); } } } private void ButtonBase_OnClick(object sender,RoutedEventArgs e) { Text = "clicked"; } public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(String info) { if (PropertyChanged != null) { PropertyChanged(this,new PropertyChangedEventArgs(info)); } } }

永远都不会显示“初始文本”和“点击”.所以我的问题是如何实施一个部门.属性正确使用

@H_502_3@<uc:MyUserControl1 MyTextProperty="{Binding Text}"/>

？感谢您帮助我