public static readonly DependencyProperty OpenZoomProperty = DependencyProperty.Register(//name    要注册的依赖项对象的名称"IsOpenZoom",//propertyType    该属性的类型，作为类型参考typeof(bool),//ownerType    正在注册依赖项属性的所有者类型，作为类型参考typeof(UserControl),//defaultMetadata    属性元数据实例。这可以包含一个 PropertyChangedCallback 实现引用。            //  都一个参数：元数据，第二个数据是反调函数【没有函数会自动注册一个】           new PropertyMetadata(false, new PropertyChangedCallback(OnChang))

            );

  //这个是ScrollViewer的是否开启放大效果
private static void OnChang(DependencyObject d, DependencyPropertyChangedEventArgs e){if (e.NewValue != null){SetPhoto setphoto = (SetPhoto)d;switch ((bool)e.NewValue){case true:setphoto.scrollViewer.ZoomMode = ZoomMode.Enabled;break;case false:setphoto.scrollViewer.ZoomMode = ZoomMode.Disabled;break;}                              }}

public bool IsOpenZoom{
//get，获取值并且转换其boolget { return (bool)GetValue(OpenZoomProperty); }
//或者值 并存储到上面说的依赖属性中set { SetValue(OpenZoomProperty, value); }}

<UserControl x:Class="水印添加M2.SetPhoto"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="using:水印添加M2"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"mc:Ignorable="d"d:DesignHeight="300"d:DesignWidth="400"><Grid><ScrollViewer x:Name="scrollViewer"  HorizontalScrollBarVisibility="Auto" ><Image x:Name="image"/></ScrollViewer></Grid>
</UserControl>

namespace Mode
{public sealed partial class SetPhoto : UserControl{public SetPhoto(){this.InitializeComponent();}public static readonly DependencyProperty OpenZoomProperty = DependencyProperty.Register(//name    要注册的依赖项对象的名称"IsOpenZoom",//propertyType    该属性的类型，作为类型参考typeof(bool),//ownerType    正在注册依赖项属性的所有者类型，作为类型参考typeof(UserControl),//defaultMetadata    属性元数据实例。这可以包含一个 PropertyChangedCallback 实现引用。new PropertyMetadata(false, new PropertyChangedCallback(OnChang)));public static readonly DependencyProperty SetImageProperty = DependencyProperty.Register("ImageSource", typeof(ImageSource), typeof(UserControl), new PropertyMetadata(null, new PropertyChangedCallback(ImageChange)));public static readonly DependencyProperty ViewChangeProperty = DependencyProperty.Register("ViewChang", typeof(float), typeof(UserControl), new PropertyMetadata(null, new PropertyChangedCallback(ViewChang)));private static void ViewChang(DependencyObject d, DependencyPropertyChangedEventArgs e){SetPhoto s = (SetPhoto)d;//第一个参数 最大倍数//第二个参数 最小倍数//第三个参数 放大倍数s.scrollViewer.ChangeView(10, 0, (float)e.NewValue);}private static void ImageChange(DependencyObject d, DependencyPropertyChangedEventArgs e){SetPhoto s = (SetPhoto)d;
          // 标准Image的Source的类型 方便s.image.Source = (ImageSource)e.NewValue;}private static void OnChang(DependencyObject d, DependencyPropertyChangedEventArgs e){if (e.NewValue != null){SetPhoto setphoto = (SetPhoto)d;switch ((bool)e.NewValue){case true:setphoto.scrollViewer.ZoomMode = ZoomMode.Enabled;break;case false:setphoto.scrollViewer.ZoomMode = ZoomMode.Disabled;break;}                              }}/// <summary>/// 图片/// </summary>public ImageSource ImageSource{get { return (ImageSource)GetValue(SetImageProperty); }set { SetValue(SetImageProperty, value); }}public bool IsOpenZoom{get { return (bool)GetValue(OpenZoomProperty); }set { SetValue(OpenZoomProperty, value); }}public float ViewChange{get { return (float)GetValue(ViewChangeProperty); }set { SetValue(ViewChangeProperty, value); }}}
}

<local:SetPhoto  Grid.Row="1" x:Name="U" IsOpenZoom="True" />

//实例化
SetPhoto setP=new SetPhoto();