WPF自定义控件步骤

1 .在类库里面添加system.xaml的引用，给控件指定Name；

2.设计控件的外观，并将内部元素绑定到控件类的属性；此时即使没有在类中增加相关属性也不会报错，xaml类似html错误只是不显示而已；

3.定义静态的依赖项；

4.定义依赖项的包装属性；

5.在静态构造函数中注册依赖项属性，注意设置回调函数；

6.实现回调函数

7 定义路由事件并注册

8.定义路由事件的包装器

9.触发路由事件

</UserControl>

using System;
using System.Collections.Generic;
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 CustomControls
{
/// <summary>
/// ColorPickerUserControl.xaml 的交互逻辑
/// </summary>
public partial class ColorPickerUserControl : UserControl
{
public ColorPickerUserControl()
{
InitializeComponent();
}

public static DependencyProperty ColorProperty;
public Color Color
{
get
{
return (Color)GetValue(ColorProperty);
}
set
{
SetValue(ColorProperty, value);
}
}

public static DependencyProperty RedProperty;
public byte Red
{
get
{
return (byte)GetValue(RedProperty);
}
set
{
SetValue(RedProperty, value);
}
}

public static DependencyProperty GreenProperty;
public byte Green
{
get
{
return (byte)GetValue(GreenProperty);
}
set
{
SetValue(GreenProperty, value);
}
}

public static DependencyProperty BlueProperty;
public byte Blue
{
get
{
return (byte)GetValue(BlueProperty);
}
set
{
SetValue(BlueProperty, value);
}
}

static ColorPickerUserControl()
{
ColorProperty = DependencyProperty.Register("Color", typeof(Color), typeof(ColorPickerUserControl),
new PropertyMetadata(Colors.Black, new PropertyChangedCallback(OnColorChanged)));
RedProperty = DependencyProperty.Register("Red", typeof(byte), typeof(ColorPickerUserControl),
new PropertyMetadata((byte)0, new PropertyChangedCallback(OnRGBChanged)));
GreenProperty = DependencyProperty.Register("Green", typeof(byte), typeof(ColorPickerUserControl),
new PropertyMetadata((byte)0, new PropertyChangedCallback(OnRGBChanged)));
BlueProperty = DependencyProperty.Register("Blue", typeof(byte), typeof(ColorPickerUserControl),
new PropertyMetadata((byte)0, new PropertyChangedCallback(OnRGBChanged)));
}

private static void OnRGBChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ColorPickerUserControl colorPicker = (ColorPickerUserControl)d;
Color color = colorPicker.Color;
if (e.Property == RedProperty)
{
color.R = (byte)e.NewValue;
}
else if (e.Property == GreenProperty)
{
color.G = (byte)e.NewValue;
}
else
{
color.B= (byte)e.NewValue;
}
colorPicker.Color = color;

}

private static void OnColorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ColorPickerUserControl colorPicker = (ColorPickerUserControl)d;
Color newColor = (Color)e.NewValue;
colorPicker.Red = newColor.R;
colorPicker.Green = newColor.G;
colorPicker.Blue = newColor.B;
Color oldColor = (Color)e.OldValue;
RoutedPropertyChangedEventArgs<Color> args = new RoutedPropertyChangedEventArgs<Color>(oldColor,newColor);
args.RoutedEvent = ColorChangedEvent;
colorPicker.RaiseEvent(args);

}

public static readonly RoutedEvent ColorChangedEvent = EventManager.RegisterRoutedEvent("ColorChanged", RoutingStrategy.Bubble,
typeof(RoutedPropertyChangedEventHandler<Color>), typeof(ColorPickerUserControl));
public event RoutedPropertyChangedEventHandler<Color> ColorChanged
{
add
{
AddHandler(ColorChangedEvent, value);
}
remove
{
RemoveHandler(ColorChangedEvent, value);
}

}

}

}

<Window x:Class="CustomControlDemo.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:CustomControlDemo"
xmlns:lib ="clr-namespace:CustomControls;assembly=CustomControls"
mc:Ignorable="d"
Title="MainWindow" Height="309.6" Width="348.2">
<Grid>
<StackPanel>
<TextBlock Name="tbColor" Margin="3">111</TextBlock>//放在usercontrol前面否则设置color时候会报错

<lib:ColorPickerUserControl Name="colorPicker" Height="Auto" Width="Auto" Margin="3" Padding="3" Color="Red"
ColorChanged="ColorPickerUserControl_ColorChanged"></lib:ColorPickerUserControl>
</StackPanel>

</Grid>

</Window>

using System;
using System.Collections.Generic;
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 CustomControlDemo
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}

private void ColorPickerUserControl_ColorChanged(object sender, RoutedPropertyChangedEventArgs<Color> e)
{
Color color = (Color)e.NewValue;
tbColor.Text = "The new Color is" + color.ToString();
}
}
}

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原文地址：https://www.cnblogs.com/dxmfans/p/9434825.html