initial commit

Converters/HexColorToBrushConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows.Data;
+using System.Windows.Media;
+
+namespace HC_APTBS.Converters
+{
+    /// <summary>
+    /// Converts a CSS-style hex colour string (e.g. "#26C200") to a
+    /// <see cref="SolidColorBrush"/> for use in WPF bindings.
+    /// Returns <see cref="Brushes.Transparent"/> for null or invalid input.
+    /// </summary>
+    [ValueConversion(typeof(string), typeof(SolidColorBrush))]
+    public sealed class HexColorToBrushConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is string hex && !string.IsNullOrWhiteSpace(hex))
+            {
+                try
+                {
+                    return new SolidColorBrush((Color)ColorConverter.ConvertFromString(hex));
+                }
+                catch { /* fall through */ }
+            }
+            return Brushes.Transparent;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+            => throw new NotSupportedException();
+    }
+}