优化更新代码，添加界面功能并整合

WPFluent/Markup/FontIconExtension.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="FontIcon"/>.
+/// </summary>
+/// <example>
+/// <code lang="xml"> /// &lt;ui:Button ///     Appearance="Primary" ///     Content="WPF UI button with font icon" /// 
+///    Icon="{ui:FontIcon '&#x1F308;'}" /&gt; ///</code> <code lang="xml"> /// &lt;ui:Button Icon="{ui:FontIcon
+/// '&amp;#x1F308;'}" /&gt; ///</code> <code lang="xml"> /// &lt;ui:HyperlinkButton Icon="{ui:FontIcon '&amp;#x1F308;'}"
+/// /&gt; ///</code> <code lang="xml"> /// &lt;ui:TitleBar Icon="{ui:FontIcon '&amp;#x1F308;'}" /&gt; ///</code>
+/// </example>
+[ContentProperty(nameof(Glyph))]
+[MarkupExtensionReturnType(typeof(FontIcon))]
+public class FontIconExtension : MarkupExtension
+{
+    public FontIconExtension()
+    {
+    }
+
+    public FontIconExtension(string glyph) { Glyph = glyph; }
+
+    public override object ProvideValue(IServiceProvider serviceProvider)
+    {
+        FontIcon fontIcon = new() { Glyph = Glyph!, FontFamily = FontFamily };
+
+        if(FontSize > 0)
+        {
+            fontIcon.FontSize = FontSize;
+        }
+
+        return fontIcon;
+    }
+
+    [ConstructorArgument("fontFamily")]
+    public FontFamily FontFamily { get; set; } = new("FluentSystemIcons");
+
+    public double FontSize { get; set; }
+
+    [ConstructorArgument("glyph")]
+    public string? Glyph { get; set; }
+}