更新

AntdWpfDemo/ViewModels/AvatarViewModel.cs

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+using Caliburn.Micro;
+
+using System.ComponentModel.Composition;
+using System.Windows.Media;
+
+namespace AntdWpfDemo.ViewModels
+{
+    [Export(typeof(IScreen))]
+    internal class AvatarViewModel : Screen
+    {
+        private string[] users = { "U", "Lucy", "Tom", "Edward" };
+
+        private string[] colors = { "#f56a00", "#7265e6", "#ffbf00", "#00a2ae" };
+
+        private int index = 0;
+
+        private Brush background;
+
+        public Brush Background
+        {
+            get { return background; }
+            set
+            {
+                background = value;
+                NotifyOfPropertyChange();
+            }
+        }
+
+        private string text;
+
+        public string Text
+        {
+            get { return text; }
+            set
+            {
+                text = value;
+                NotifyOfPropertyChange();
+            }
+        }
+
+        public AvatarViewModel()
+        {
+            DisplayName = "Avatar";
+            Change();
+        }
+
+        public void Change()
+        {
+            if (index >= users.Length)
+            {
+                index = 0;
+            }
+
+            Text = users[index];
+            Background = new SolidColorBrush((Color)ColorConverter.ConvertFromString(colors[index]));
+
+            index++;
+        }
+    }
+}