wpf 给UserControl添加依赖属性

1 新建wpf项目

2 新建wpf 用户控件库

3 新建MyTextUC,为其添加两个依赖属性，Text和Color，注意前端设置属性是string类型，wpf自带的转换器只能将string转换成color，但无法转换成Brush,所以需要添加ColorToBrush转换器

<UserControl x:Class="CustomControls.MyTextUC"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:CustomControls"
             mc:Ignorable="d" x:Name="myTextUC" Height="204" Width="475">
    <UserControl.Resources>
        <ResourceDictionary>
            <local:ColorToBrushConverter x:Key="ColorToBrushConverter" />
        </ResourceDictionary>
    </UserControl.Resources>
    <Grid>
        <TextBlock Background="{Binding ElementName=myTextUC, Path=Color,Converter={StaticResource ColorToBrushConverter}}" Text="{Binding ElementName=myTextUC, Path=Text}"/>
    </Grid>
</UserControl>

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

        public static readonly DependencyProperty ColorProperty = DependencyProperty.Register("Color", typeof(Color), typeof(MyTextUC),
                new PropertyMetadata(Colors.Black));

        public static readonly DependencyProperty TextProperty =
            DependencyProperty.Register("Text", typeof(string), typeof(MyTextUC), new PropertyMetadata(""));

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


        public string Text
        {
            get { return (string)GetValue(TextProperty); }
            set { SetValue(TextProperty, value); }
        }



    }
}

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Globalization;
using System.Text;
using System.Windows.Data;
using System.Windows.Media;
using Color = System.Windows.Media.Color;

namespace CustomControls
{
    public class ColorToBrushConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            Color color = (Color)value;
            return new SolidColorBrush(color);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

4 在MainWindow前端引入自定义类库，修改代码

<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"
        mc:Ignorable="d"
        xmlns:lib="clr-namespace:CustomControls;assembly=CustomControls"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <lib:MyTextUC  Text="hello world" Color="Blue"/>
    </Grid>
</Window>