feat: 增加选中节点逻辑

Author: ArgoZhang

src/BootstrapBlazor/Components/Select/SelectTree.razor

@@ -20,7 +20,7 @@
         <span class="@AppendClassName"><i class="@DropdownIcon"></i></span>
     </div>
     <div class="dropdown-menu">
-        <TreeView TItem="TValue" Items="@Items" ShowIcon="ShowIcon"
+        <TreeView TItem="TValue" Items="@Items" ShowIcon="ShowIcon" @ref="_tv"
                   OnTreeItemClick="OnItemClick" ModelEqualityComparer="@ModelEqualityComparer"
                   ShowSearch="ShowSearch" ShowResetSearchButton="ShowResetSearchButton"
                   CanExpandWhenDisabled="CanExpandWhenDisabled"

src/BootstrapBlazor/Components/Select/SelectTree.razor.cs

@@ -166,6 +166,7 @@ public partial class SelectTree<TValue> : IModelEqualityComparer<TValue>
     private TreeViewItem<TValue>? _selectedItem;
     private List<TreeViewItem<TValue>>? _itemCache;
     private List<TreeViewItem<TValue>>? _expandedItemsCache;
+    private TreeView<TValue> _tv = default!;
 
     private string? SelectTreeCustomClassString => CssBuilder.Default(CustomClassString)
         .AddClass("select-tree", IsPopover)
@@ -233,6 +234,12 @@ private void OnChange(ChangeEventArgs args)
         if (args.Value is string v)
         {
             CurrentValueAsString = v;
+
+            // 选中节点更改为当前值
+            if(_tv != null)
+            {
+                _tv.SetActiveItem(Value);
+            }
         }
     }