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WPF/AttachedProperty.md

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+# 释义
+
+本不属于某个对象的属性，在被需要的时候后来附加;在特定环境下，对象才具有的属性，如当一个控件在Grid中时，会附加Grid.Column属性等
+
+本质上是依赖属性
+用clr属性包装时不同，是采用两个方法
+
+```csharp
+public static int GetMyProperty(DependencyObject obj)
+        {
+            return (int)obj.GetValue(MyPropertyProperty);
+        }
+
+        public static void SetMyProperty(DependencyObject obj, int value)
+        {
+            obj.SetValue(MyPropertyProperty, value);
+        }
+
+        // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...
+        public static readonly DependencyProperty MyPropertyProperty =
+            DependencyProperty.RegisterAttached("MyProperty", typeof(int), typeof(ownerclass), new PropertyMetadata(0));
+```
+
+把年级附加属性附加给人
+
+```csharp
+class Human:DependencyObject
+{
+
+}
+Human human=new Human()
+School.SetMyProperty(human,6)//设置属性
+int grade=School.GetMyProperty(human)//得到属性值
+```