doc: 更新示例

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Samples/TreeViews.razor

@@ -27,7 +27,7 @@
            Introduction="@Localizer["TreeViewNormalIntro"]"
            Name="Normal">
     <section ignore>@((MarkupString)Localizer["TreeViewNormalDescription"].Value)</section>
-    <TreeView TItem="TreeFoo" Items="@Items" OnTreeItemClick="@OnTreeItemClick" />
+    <TreeView TItem="TreeFoo" Items="@NormalItems" OnTreeItemClick="@OnTreeItemClick" />
     <ConsoleLogger @ref="Logger1" />
 </DemoBlock>
 

src/BootstrapBlazor.Server/Components/Samples/TreeViews.razor.cs

@@ -23,8 +23,11 @@ public sealed partial class TreeViews
     private ConsoleLogger? Logger3 { get; set; }
 
     private bool DisableCanExpand { get; set; }
+
     private bool IsDisabled { get; set; }
 
+    private List<TreeViewItem<TreeFoo>> NormalItems { get; } = TreeFoo.GetTreeItems();
+
     private List<TreeViewItem<TreeFoo>> Items { get; } = TreeFoo.GetTreeItems();
 
     private bool AutoCheckChildren { get; set; }