1，创建自定义控件类
class CustomDrawnElement:FrameworkElement{public static readonly DependencyProperty BackgroundColorProperty;static CustomDrawnElement(){FrameworkPropertyMetadata meta = new FrameworkPropertyMetadata(Colors.SkyBlue);meta.AffectsRender = true;//依赖属性改变时要求重绘BackgroundColorProperty = DependencyProperty.Register("BackgroundColor", typeof(Color), typeof(CustomDrawnElement), meta);}/// <summary>/// 背景颜色（依赖属性）/// </summary>[Bindable(true),Category("自定义设置"),Browsable(true)]public Color BackgroundColor{get{return (Color)GetValue(BackgroundColorProperty);}set{SetValue(BackgroundColorProperty, value);}}protected override void OnMouseMove(MouseEventArgs e){base.OnMouseMove(e);this.InvalidateVisual();}protected override void OnMouseLeave(MouseEventArgs e){base.OnMouseLeave(e);this.InvalidateVisual();}protected override void OnRender(DrawingContext drawingContext){//自定义绘图drawingContext.DrawRectangle(GetBrush(), null, new Rect(0, 0, this.ActualWidth, this.ActualHeight));base.OnRender(drawingContext);}Brush GetBrush(){if (!this.IsMouseOver){return new SolidColorBrush(BackgroundColor);}Point curPoint = Mouse.GetPosition(this);//计算相对位置RadialGradientBrush radialBrush = new RadialGradientBrush(Colors.White, BackgroundColor);Point relativePoint = new Point(curPoint.X / this.ActualWidth, curPoint.Y / this.ActualHeight);radialBrush.Center = relativePoint;radialBrush.GradientOrigin = relativePoint;return radialBrush;// radialBrush.GradientOrigin}}
2，在UI中添加该控件
<Grid><Grid.RowDefinitions><RowDefinition /><RowDefinition Height="auto"/></Grid.RowDefinitions><local:CustomDrawnElement BackgroundColor="{Binding ElementName=combo01, Path=Text}"></local:CustomDrawnElement><StackPanel Margin="10" Orientation="Horizontal" Grid.Row="1"><TextBlock VerticalAlignment="Center" Text="选择背景色：" FontSize="16"></TextBlock><ComboBox Width="150" FontSize="16" VerticalContentAlignment="Center" x:Name="combo01"></ComboBox></StackPanel></Grid>
3，相关代码
public partial class MainWindow : Window{public MainWindow(){InitializeComponent();List<string> colors = new List<string>();foreach (var item in typeof(Colors).GetProperties(System.Reflection.BindingFlags.Public| System.Reflection.BindingFlags.Static)){colors.Add(item.Name);}combo01.ItemsSource = colors;combo01.SelectedIndex = 0;}}
4，效果
