依赖属性继承_如何继承依赖属性-优快云博客

本文链接：https://blog.youkuaiyun.com/ajian11/article/details/82505762

本文介绍了一个WPF应用程序中如何通过自定义控件实现依赖属性的继承。通过创建自定义的MyStackPanel和MyCustomButton控件，并设置FrameworkPropertyMetadataOptions.Inherits选项来实现属性的继承。

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public class MyCustomButton : Button
{
static MyCustomButton()
     {
//通过MyStackPanel依赖属性MinDateProperty的AddOwner方式实现继承，注意FrameworkPropertyMetadataOptions的值为Inherits
MinDateProperty = MyStackPanel.MinDateProperty.AddOwner(typeof(MyCustomButton),
new FrameworkPropertyMetadata(DateTime.MinValue, FrameworkPropertyMetadataOptions.Inherits));
     }

public static readonly DependencyProperty MinDateProperty;

public DateTime MinDate
     {
get { return (DateTime)GetValue(MinDateProperty); }
set { SetValue(MinDateProperty, value); }
     }
 }


public class MyStackPanel : StackPanel
{
static MyStackPanel()
     {
//我们在MyStackPanel里面注册了MinDate，注意FrameworkPropertyMetadataOptions的值为Inherits
MinDateProperty = DependencyProperty.Register("MinDate",
typeof(DateTime),
typeof(MyStackPanel),
new FrameworkPropertyMetadata(DateTime.MinValue, FrameworkPropertyMetadataOptions.Inherits));
     }

public static readonly DependencyProperty MinDateProperty;

public DateTime MinDate
     {
get { return (DateTime)GetValue(MinDateProperty); }
set { SetValue(MinDateProperty, value); }
     }
 }

<Window x:Class="Custom_Inherited_DPs.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Custom_Inherited_DPs" 
xmlns:sys="clr-namespace:System;assembly=mscorlib"   
WindowStartupLocation="CenterScreen" 
Title="使用自动以依赖属性继承" Height="300" Width="300">
    <Grid>
        <local:MyStackPanel x:Name="myStackPanel" MinDate="{x:Static sys:DateTime.Now}">
<!-- myStackPanel的依赖属性 -->
<ContentPresenter Content="{Binding Path=MinDate, ElementName=myStackPanel}"/>
<!-- 继承自myStackPanel的依赖属性 -->
<local:MyCustomButton 
Content="{Binding RelativeSource={x:Static RelativeSource.Self},
Path=MinDate}" 
Height="20"/>
        </local:MyStackPanel>
   </Grid>
</Window>