优化更新代码，添加界面功能并整合

WPFluent/Controls/BreadcrumbBar/BreadcrumbBarItemClickedEventArgs.cs

@@ -0,0 +1,29 @@
+
+
+
+// Based on Windows UI Library
+// Copyright(c) Microsoft Corporation.All rights reserved.
+
+// ReSharper disable once CheckNamespace
+namespace WPFluent.Controls;
+
+public sealed class BreadcrumbBarItemClickedEventArgs : RoutedEventArgs
+{
+    public BreadcrumbBarItemClickedEventArgs(RoutedEvent routedEvent, object source, object item, int index) : base(
+        routedEvent,
+        source)
+    {
+        Item = item;
+        Index = index;
+    }
+
+    /// <summary>
+    /// Gets the index of the item that was clicked.
+    /// </summary>
+    public int Index { get; }
+
+    /// <summary>
+    /// Gets the Content property value of the BreadcrumbBarItem that is clicked.
+    /// </summary>
+    public object Item { get; }
+}