WPF Customize Ellipse and show string with customized filled color

//xaml
<UserControl x:Class="WpfApp263.ELpTbk"
             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:WpfApp263"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <Ellipse Fill="{Binding FillColorBrush,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>
        <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="30"
                   Text="{Binding TbkStr,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                   Foreground="{Binding TbkForeColor,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>
    </Grid>
</UserControl>


//cs
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 WpfApp263
{
    /// <summary>
    /// Interaction logic for ELpTbk.xaml
    /// </summary>
    public partial class ELpTbk : UserControl
    {
        public ELpTbk()
        {
            InitializeComponent();
            this.DataContext = this;
        }



        public SolidColorBrush FillColorBrush
        {
            get { return (SolidColorBrush)GetValue(FillColorBrushProperty); }
            set { SetValue(FillColorBrushProperty, value); }
        }

        // Using a DependencyProperty as the backing store for FillColorBrush.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty FillColorBrushProperty =
            DependencyProperty.Register("FillColorBrush", typeof(SolidColorBrush),
                typeof(ELpTbk), new PropertyMetadata(null));



        public string TbkStr
        {
            get { return (string)GetValue(TbkStrProperty); }
            set { SetValue(TbkStrProperty, value); }
        }

        // Using a DependencyProperty as the backing store for TbkStr.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty TbkStrProperty =
            DependencyProperty.Register("TbkStr", typeof(string), 
                typeof(ELpTbk), new PropertyMetadata(""));



        public SolidColorBrush TbkForeColor
        {
            get { return (SolidColorBrush)GetValue(TbkForeColorProperty); }
            set { SetValue(TbkForeColorProperty, value); }
        }

        // Using a DependencyProperty as the backing store for TbkForeColor.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty TbkForeColorProperty =
            DependencyProperty.Register("TbkForeColor", typeof(SolidColorBrush), 
                typeof(ELpTbk), new PropertyMetadata(null));


    }
}

 

 

 

 

using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
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 WpfApp263
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private int width;
        private int height;
        private Random rnd;

        public MainWindow()
        {
            InitializeComponent();
            this.WindowState = WindowState.Maximized;
            this.Loaded += MainWindow_Loaded;
        }

        private void MainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            width = (int)(this.ActualWidth - 100);
            height = (int)(this.ActualHeight - 100);
            rnd = new Random();
            DrawElpTbks();
        }

        private void DrawElpTbks()
        {
            Canvas cvs = new Canvas();
            Button btn = new Button();
            btn.HorizontalAlignment = HorizontalAlignment.Left;
            btn.VerticalAlignment = VerticalAlignment.Top;
            btn.Width = 100;
            btn.Height = 50;
            btn.Content = "Refresh";
            btn.Click += Btn_Click;
            if(!cvs.Children.Contains(btn))
            {
                Canvas.SetLeft(btn, 0);
                Canvas.SetTop(btn, 0);
                cvs.Children.Add(btn);
            }
            for(int i=0;i<10;i++)
            {
                ELpTbk elp = new ELpTbk();
                elp.Width = 100;
                elp.Height = 100;
                int fillColorIdx = rnd.Next(0, 10);
                elp.FillColorBrush=GetColorBrushViaIndex(fillColorIdx);
                int tbkForeColorIdx=rnd.Next(0, 10);
                while(tbkForeColorIdx==fillColorIdx)
                {
                    tbkForeColorIdx= rnd.Next(0, 10);
                }
                elp.TbkForeColor=GetColorBrushViaIndex(tbkForeColorIdx);
                elp.TbkStr = i.ToString();
                Canvas.SetLeft(elp, rnd.Next(0, width));
                Canvas.SetTop(elp, rnd.Next(0, height));
                if(!cvs.Children.Contains(elp))
                {
                    cvs.Children.Add(elp);
                }
            }
            this.Content = cvs;
        }

        private void Btn_Click(object sender, RoutedEventArgs e)
        {
            DrawElpTbks();
        }

        private SolidColorBrush GetColorBrushViaIndex(int index)
        {
            SolidColorBrush coloBrush = new SolidColorBrush();
            switch(index%10)
            {
                case 0:
                    coloBrush = new SolidColorBrush(Colors.Red);
                    break;
                case 1:
                    coloBrush = new SolidColorBrush(Colors.Green);
                    break;
                case 2:
                    coloBrush = new SolidColorBrush(Colors.Blue);
                    break;
                case 3:
                    coloBrush = new SolidColorBrush(Colors.Orange);
                    break;
                case 4:
                    coloBrush = new SolidColorBrush(Colors.Yellow);
                    break;
                case 5:
                    coloBrush = new SolidColorBrush(Colors.Cyan);
                    break;
                case 6:
                    coloBrush = new SolidColorBrush(Colors.Gray);
                    break;
                case 7:
                    coloBrush = new SolidColorBrush(Colors.DarkMagenta);
                    break;
                case 8:
                    coloBrush = new SolidColorBrush(Colors.Purple);
                    break;
                case 9:
                    coloBrush = new SolidColorBrush(Colors.Brown);
                    break;  
            }
            return coloBrush;
        } 
    }
}