优化更新代码，添加界面功能并整合

WPFluent/Controls/MessageBox/MessageBoxImageExtensions.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Windows;
+
+namespace WPFluent.Controls;
+
+public static class MessageBoxImageExtensions
+{
+    public static string ToGlyph(this MessageBoxSymbolGlyph symbol)
+    {
+        return char.ConvertFromUtf32((int)symbol);
+    }
+
+    public static MessageBoxSymbolGlyph ToSymbol(this MessageBoxImage image)
+    {
+        return image switch
+        {
+            MessageBoxImage.Error => MessageBoxSymbolGlyph.Error,
+            MessageBoxImage.Information => MessageBoxSymbolGlyph.Info,
+            MessageBoxImage.Warning => MessageBoxSymbolGlyph.Warning,
+            MessageBoxImage.Question => MessageBoxSymbolGlyph.Question,
+            MessageBoxImage.None => (MessageBoxSymbolGlyph)0x2007,
+            _ => throw new NotSupportedException(),
+        };
+    }
+}