WPF usercontrol 自定义依赖属性

1.依赖属性不同意一般属性，一般属性主要定义在对象中，而依赖属性是存在一个特殊的依赖属性表中。
2.当我们触发改变值时，需要通过SetValue这种方式进行触发。

UserControl1.xaml:

<UserControl x:Class="WpfApplication1.UserControl1"
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:WpfApplication1"
mc:Ignorable="d"  Name="myUserControl"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<TextBox Name="textBox" TextChanged="textBox_TextChanged"></TextBox>
</Grid>
</UserControl>

UserControl1.xml.cs:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication1
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window,INotifyPropertyChanged
{

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

private string myVar;

public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
public string MyValue
{
get { return myVar; }
set { myVar = value;
OnPropertyChanged("MyValue");
}
}
}
}

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