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doc: 增加注释
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src/BootstrapBlazor.Server/Components/Samples/TreeViews.razor.cs

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@@ -109,6 +109,7 @@ private Task OnTreeItemClick(TreeViewItem<TreeFoo> item)
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private Task OnDragItemEndAsync(TreeViewDragContext<TreeFoo> context)
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{
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// 本例是使用静态数据模拟数据库操作的,实战中应该是更新节点的父级 Id 可能还需要更改排序字段等信息,然后重构 TreeView 数据源即可
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// 根据 context 处理原始数据
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var items = GetDraggableItems();
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var source = items.Find(i => i.Id == context.Source.Value.Id);

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