优化更新代码，添加界面功能并整合

WPFluent/Extensions/SymbolExtensions.cs

@@ -0,0 +1,44 @@
+
+
+
+using WPFluent.Controls;
+
+using System.Text;
+
+namespace WPFluent.Extensions;
+
+/// <summary>
+/// Set of extensions for the enumeration of icons to facilitate their management and replacement.
+/// </summary>
+public static class SymbolExtensions
+{
+    /// <summary>
+    /// Converts <see cref="SymbolRegular"/> to <see langword="string"/> based on the ID.
+    /// </summary>
+    public static string GetString(this SymbolRegular icon)
+    { return Encoding.Unicode.GetString(BitConverter.GetBytes((int)icon)).TrimEnd('\0'); }
+
+    /// <summary>
+    /// Converts <see cref="SymbolFilled"/> to <see langword="string"/> based on the ID.
+    /// </summary>
+    public static string GetString(this SymbolFilled icon)
+    { return Encoding.Unicode.GetString(BitConverter.GetBytes((int)icon)).TrimEnd('\0'); }
+
+    /// <summary>
+    /// Replaces <see cref="SymbolRegular"/> with <see cref="SymbolFilled"/>.
+    /// </summary>
+    public static SymbolFilled Swap(this SymbolRegular icon)
+    {
+        // It is possible that the alternative icon does not exist
+        return SymbolGlyph.ParseFilled(icon.ToString());
+    }
+
+    /// <summary>
+    /// Replaces <see cref="SymbolFilled"/> with <see cref="SymbolRegular"/>.
+    /// </summary>
+    public static SymbolRegular Swap(this SymbolFilled icon)
+    {
+        // It is possible that the alternative icon does not exist
+        return SymbolGlyph.Parse(icon.ToString());
+    }
+}