[WPF]WPF 自定义依赖属性

WPF 自定义依赖属性

为一个UserControl自定义一个依赖属性MyColor改变UserControl的前景色

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
 
 
namespace DependencyPropertyTest
{
    /// <summary>
    /// MyDependencyProperty.xaml 的交互逻辑
    /// </summary>
    public partial class MyDependencyProperty : UserControl
    {
        public MyDependencyProperty()
        {
            InitializeComponent();
        }
 
        //1、声明依赖属性变量  
        //2、在属性系统中进行注册
        public static readonly DependencyProperty MyColorProperty = DependencyProperty.Register("MyColor", typeof(string), typeof(MyDependencyProperty),
                new PropertyMetadata("Red", (s, e) =>
                {
                    var mdp = s as MyDependencyProperty;
                    if (mdp != null)
                    {
                        try
                        {
                            var color = (Color)ColorConverter.ConvertFromString(e.NewValue.ToString());
                            mdp.Foreground = new SolidColorBrush(color);
                        }
                        catch
                        {
                            mdp.Foreground = new SolidColorBrush(Colors.Black);
                        }
                    }
                }));
 
        //3、使用.NET属性包装依赖属性:属性名称与注册时候的名称必须一致，
        //即属性名MyColor对应注册时的MyColor
        public string MyColor
        {
            get
            {
                return (string)GetValue(MyColorProperty);
            }
            set
            {
                SetValue(MyColorProperty, value);
            }
        }
    }
}