feat(TreeView): add IsIncludeIndeterminateWhenGetCheckedItems parameter

src/BootstrapBlazor/Components/TreeView/TreeView.razor.cs

@@ -324,6 +324,13 @@ public partial class TreeView<TItem> : IModelEqualityComparer<TItem>
     [Parameter]
     public bool AutoCheckParent { get; set; }
 
+    /// <summary>
+    /// <para lang="zh">获得/设置 <see cref="GetCheckedItems()"/> 方法返回的集合是否包含半选节点，默认为 false</para>
+    /// <para lang="en">Gets or sets whether the collection returned by <see cref="GetCheckedItems()"/> includes indeterminate nodes. Default is false</para>
+    /// </summary>
+    [Parameter]
+    public bool IsIncludeIndeterminateWhenGetCheckedItems { get; set; }
+
     /// <summary>
     /// <para lang="zh">获得/设置 是否允许拖放操作，默认为 false</para>
     /// <para lang="en">Gets or sets a value indicating whether drag-and-drop operations are allowed. Default is false</para>
@@ -955,7 +962,10 @@ public IEnumerable<TreeViewItem<TItem>> GetCheckedItems() => Items.Aggregate(new
         t.Add(item);
         t.AddRange(item.GetAllSubItems().OfType<TreeViewItem<TItem>>());
         return t;
-    }).Where(i => i.CheckedState == CheckboxState.Checked);
+    }).Where(GetCheckedItems);
+
+
+    private bool GetCheckedItems(TreeViewItem<TItem> item) => IsIncludeIndeterminateWhenGetCheckedItems ? item.CheckedState != CheckboxState.UnChecked : item.CheckedState == CheckboxState.Checked;
 
     /// <summary>
     /// <para lang="zh">检查数据是否相同</para>

test/UnitTest/Components/TreeViewTest.cs

@@ -333,6 +333,35 @@ public async Task AutoCheckParent_TriState_Ok()
         Assert.Equal(CheckboxState.UnChecked, checkboxes[0].Instance.Value.CheckedState);
     }
 
+    [Fact]
+    public void GetCheckedItems_IncludeIndeterminate_Ok()
+    {
+        var items = new List<TreeFoo>
+        {
+            new() { Text = "Node1", Id = "1010" },
+            new() { Text = "Node11", Id = "1011", ParentId = "1010" },
+            new() { Text = "Node12", Id = "1012", ParentId = "1010" }
+        };
+
+        var nodes = TreeFoo.CascadingTree(items);
+        nodes[0].Items[0].CheckedState = CheckboxState.Checked;
+
+        var cut = Context.Render<TreeView<TreeFoo>>(pb =>
+        {
+            pb.Add(a => a.AutoCheckParent, true);
+            pb.Add(a => a.Items, nodes);
+            pb.Add(a => a.ShowCheckbox, true);
+        });
+
+        Assert.Equal(CheckboxState.Indeterminate, nodes[0].CheckedState);
+        Assert.False(cut.Instance.IsIncludeIndeterminateWhenGetCheckedItems);
+        Assert.Equal([nodes[0].Items[0]], cut.Instance.GetCheckedItems());
+
+        cut.Render(pb => pb.Add(a => a.IsIncludeIndeterminateWhenGetCheckedItems, true));
+
+        Assert.Equal([nodes[0], nodes[0].Items[0]], cut.Instance.GetCheckedItems());
+    }
+
     [Fact]
     public async Task AutoCheckParent_ToggleNode_Ok()
     {