优化更新代码，添加界面功能并整合

WPFluent/Markup/SymbolIconExtension.cs

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+
+
+
+using WPFluent.Controls;
+
+using System.Windows.Markup;
+
+namespace WPFluent.Markup;
+
+/// <summary>
+/// Custom <see cref="MarkupExtension"/> which can provide <see cref="SymbolIcon"/>.
+/// </summary>
+/// <example>
+/// <code lang="xml"> /// &lt;ui:Button ///     Appearance="Primary" ///     Content="WPF UI button with font icon" /// 
+///    Icon="{ui:SymbolIcon Symbol=Fluent24}" /&gt; ///</code> <code lang="xml"> /// &lt;ui:Button Icon="{ui:SymbolIcon
+/// Fluent24}" /&gt; ///</code> <code lang="xml"> /// &lt;ui:HyperlinkButton Icon="{ui:SymbolIcon Fluent24}" /&gt;
+/// ///</code> <code lang="xml"> /// &lt;ui:TitleBar Icon="{ui:SymbolIcon Fluent24}" /&gt; ///</code>
+/// </example>
+[ContentProperty(nameof(Symbol))]
+[MarkupExtensionReturnType(typeof(SymbolIcon))]
+public class SymbolIconExtension : MarkupExtension
+{
+    public SymbolIconExtension()
+    {
+    }
+
+    public SymbolIconExtension(SymbolRegular symbol) { Symbol = symbol; }
+
+    public SymbolIconExtension(string symbol) { Symbol = (SymbolRegular)Enum.Parse(typeof(SymbolRegular), symbol); }
+
+    public SymbolIconExtension(SymbolRegular symbol, bool filled) : this(symbol) { Filled = filled; }
+
+    public override object ProvideValue(IServiceProvider serviceProvider)
+    {
+        SymbolIcon symbolIcon = new(Symbol, filled: Filled);
+
+        if (FontSize > 0)
+        {
+            symbolIcon.FontSize = FontSize;
+        }
+
+        return symbolIcon;
+    }
+
+    [ConstructorArgument("filled")]
+    public bool Filled { get; set; }
+
+    public double FontSize { get; set; }
+
+    [ConstructorArgument("symbol")]
+    public SymbolRegular Symbol { get; set; }
+}