.net加载TreeView

 

 

使用方法:创建一个TreeHelper对象，传入要加载数据的TreeView，和获取数据的方法，该方法是为获取父结点下的所有子结点。

public class TreeHelper
    {
        public delegate IEnumerable<TreeNode> LoadSubNode(TreeNode parent);
        private TreeView _tree;        
        private LoadSubNode _loadSubNode;

        public TreeHelper(TreeView tree,LoadSubNode loadSubNode)
        {
            if (tree == null || tree.Nodes.Count < 1)
            {
                throw new ArgumentNullException("TreeView不能为空，并且必要有根结点。");
            }
            else if (loadSubNode == null)
            {
                throw new ArgumentNullException("TreeView不能为空，并且必要有根结点。");
            }

            this._loadSubNode = loadSubNode;
            _tree = tree;
            this.LoadTree(_tree.Nodes[0]);
        }

        public void LoadTree(TreeNode parentNode)
        {
            IEnumerable<TreeNode> subElements = _loadSubNode(parentNode);

            foreach (TreeNode child in subElements)
            {   
                parentNode.ChildNodes.Add(child);
                LoadTree(child);
            }
        }
    }