ant-design-blazor/components/tree/TreeIndent.razor

@namespace AntDesign
@inherits ComponentBase
@typeparam TItem

<span class="ant-tree-indent" aria-hidden="true">
    @for (int i = TreeLevel; i > 0; i--)
    {
        if (TreeComponent.IndentTemplate != null)
        {
            @TreeComponent.IndentTemplate(SelfNode)
        }
        else
        {
            var node = GetParentNode(SelfNode, i);
            <span class="ant-tree-indent-unit ant-tree-indent-unit-start @(node.IsLastNode?"ant-tree-indent-unit-end":"")"></span>
        }
    }
</span>