using System.Drawing;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Media;

namespace WpfApp2
{
    /// <summary>
    /// MainWindow.xaml 的互動邏輯
    /// </summary>
    public partial class MainWindow : Window
    {
        ColorDialog colorDialog = new ColorDialog();
        
 
public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (colorDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)//呼叫顏色選擇器對話方塊
            {
                //提取選中的顏色
                SolidBrush sb = new
 
 SolidBrush(colorDialog.Color);
                SolidColorBrush solidColorBrush = new SolidColorBrush(System.Windows.Media.Color.FromArgb(sb.Color.A, sb.Color.R, sb.Color.G, sb.Color.B));
                myText.Foreground = solidColorBrush;//改變字型顏色
            }
        }
    }
}

<Window x:Class
 
="WpfApp2.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:WpfApp2"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <StackPanel>
        <TextBlock x:Name="myText" Text="文字" ></TextBlock>
        <Button Content="改變顏色" Click="Button_Click"></Button>

    </StackPanel>
</Window>