添加Avalonia项目的demo

Serein.Workbench.Avalonia/Converters/BoolToBrushConverter .cs

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+using Avalonia.Data.Converters;
+using Avalonia.Media;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Workbench.Avalonia.Converters
+{
+    public class BoolToBrushConverter : IValueConverter
+    {
+        public IBrush TrueBrush { get; set; } = Brushes.LightBlue;
+        public IBrush FalseBrush { get; set; } = Brushes.Transparent;
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is bool boolValue)
+            {
+                return boolValue ? TrueBrush : FalseBrush;
+            }
+            return FalseBrush;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return false;
+        }
+    }
+}