优化更新代码，添加界面功能并整合

WPFluent/Controls/BreadcrumbBar/BreadcrumbBarItem.cs

@@ -0,0 +1,59 @@
+
+
+
+/* Based on Windows UI Library */
+
+// ReSharper disable once CheckNamespace
+
+namespace WPFluent.Controls;
+
+/// <summary>
+/// Represents an item in a <see cref="BreadcrumbBar"/> control.
+/// </summary>
+public class BreadcrumbBarItem : System.Windows.Controls.ContentControl
+{
+    /// <summary>
+    /// Identifies the <see cref="IconMargin"/> dependency property.
+    /// </summary>
+    public static readonly DependencyProperty IconMarginProperty = DependencyProperty.Register(
+        nameof(IconMargin),
+        typeof(Thickness),
+        typeof(BreadcrumbBarItem),
+        new PropertyMetadata(new Thickness(0)));
+    /// <summary>
+    /// Identifies the <see cref="Icon"/> dependency property.
+    /// </summary>
+    public static readonly DependencyProperty IconProperty = DependencyProperty.Register(
+        nameof(Icon),
+        typeof(IconElement),
+        typeof(BreadcrumbBarItem),
+        new PropertyMetadata(null, null, IconElement.Coerce));
+
+    /// <summary>
+    /// Identifies the <see cref="IsLast"/> dependency property.
+    /// </summary>
+    public static readonly DependencyProperty IsLastProperty = DependencyProperty.Register(
+        nameof(IsLast),
+        typeof(bool),
+        typeof(BreadcrumbBarItem),
+        new PropertyMetadata(false));
+
+    /// <summary>
+    /// Gets or sets displayed <see cref="IconElement"/>.
+    /// </summary>
+    public IconElement Icon { get => (IconElement)GetValue(IconProperty); set => SetValue(IconProperty, value); }
+
+    /// <summary>
+    /// Gets or sets get or sets margin for the <see cref="Icon"/>
+    /// </summary>
+    public Thickness IconMargin
+    {
+        get => (Thickness)GetValue(IconMarginProperty);
+        set => SetValue(IconMarginProperty, value);
+    }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the current item is the last one.
+    /// </summary>
+    public bool IsLast { get => (bool)GetValue(IsLastProperty); set => SetValue(IsLastProperty, value); }
+}