private static IList <TreeingNode <T, TId> > LookupNodes <T, TId>(IEnumerable <T> items,
TId parentId, int depthLevel = 0)
where T : IParentIdentifier <TId>
where TId : IEquatable <TId>
{
var nodes = new List <TreeingNode <T, TId> >();
// 提取父元素集合
var parents = items.Where(p => p.ParentId.Equals(parentId));
if (parents.IsEmpty())
{
return(nodes);
}
foreach (var p in parents)
{
var node = new TreeingNode <T, TId>(p, depthLevel);
var children = LookupNodes(items, p.Id, node.DepthLevel + 1);
node.Children = children;
nodes.Add(node);
}
return(nodes);
}
public virtual bool Equals(TreeingNode <T, TId> other)
{
other.NotNull(nameof(other));
return(Id.Equals(other.Id) && ParentId.Equals(other.ParentId));
}
/// <summary>
/// 是否包含指定标识的子节点。
/// </summary>
/// <param name="childId">给定的子节点信号。</param>
/// <param name="child">输出当前子节点。</param>
/// <returns>返回布尔值。</returns>
public virtual bool ContainsChild(TId childId, out TreeingNode <T, TId> child)
{
child = GetChild(childId);
return(child.IsNotNull());
}
