WPF TreeView 修改颜色

1. 创建IValueConverter的转换器类，该类实现随机生成颜色

public class RandomColorConverter : IValueConverter
    {
        private Random random = new Random();
        private byte[] randomColors = new byte[3];
        private Dictionary<int, SolidColorBrush> groupColer = new Dictionary<int, SolidColorBrush>();
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            Image image = value as Image;
            if (image != null)
            {
                
                int id = image.FilePath.GroupID;
                if (!groupColer.Keys.Contains(id))
                {
                    if (id == 0)
                    {
                        randomColors[0] = (byte)0;
                        randomColors[1] = (byte)0;
                        randomColors[2] = (byte)0;
                    }
                    else
                    {
                        randomColors[0] = (byte)random.Next(0, 256); // Red  
                        randomColors[1] = (byte)random.Next(0, 256); // Green  
                        randomColors[2] = (byte)random.Next(0, 256); // Blue   
                    }

                    groupColer[id] = new SolidColorBrush(Color.FromRgb(randomColors[0], randomColors[1], randomColors[2]));

                }
                return groupColer[id];
            }
            return new SolidColorBrush(Color.FromRgb(0, 0, 0));

        }

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

2. 在你的XAML资源中注册这个转换器

    <UserControl.Resources>
        <ResourceDictionary>
             <converters:RandomColorConverter x:Key="RandomColorConverter"/>
        </ResourceDictionary>
    </UserControl.Resources>

3. 绑定属性

        Foreground="{Binding Converter={StaticResource RandomColorConverter}}"