优化更新代码，添加界面功能并整合

WPFluent/Converters/IconElementConverter.cs

@@ -0,0 +1,43 @@
+using WPFluent.Controls;
+using WPFluent.Extensions;
+
+
+// ReSharper disable once CheckNamespace
+namespace WPFluent.Converters;
+
+/// <summary>
+/// Tries to convert <see cref="SymbolRegular"/> and <seealso cref="SymbolFilled"/>  to <see cref="SymbolIcon"/>.
+/// </summary>
+public class IconElementConverter : TypeConverter
+{
+    public override bool CanConvertFrom(ITypeDescriptorContext? context, Type sourceType)
+    {
+        if (sourceType == typeof(SymbolRegular))
+        {
+            return true;
+        }
+
+        if (sourceType == typeof(SymbolFilled))
+        {
+            return true;
+        }
+
+        return false;
+    }
+
+    public override bool CanConvertTo(ITypeDescriptorContext? context, Type? destinationType) => false;
+
+    public override object? ConvertFrom(ITypeDescriptorContext? context, CultureInfo? culture, object? value) => value switch
+    {
+        SymbolRegular symbolRegular => new SymbolIcon(symbolRegular),
+        SymbolFilled symbolFilled => new SymbolIcon(symbolFilled.Swap(), filled: true),
+        _ => null,
+    };
+
+    public override object ConvertTo(
+        ITypeDescriptorContext? context,
+        CultureInfo? culture,
+        object? value,
+        Type destinationType)
+    { throw GetConvertFromException(value); }
+}