递归生成树对象，应用于Easyui，Tree控件

1.生成树节点对象

/// <summary>
    /// 生成树的节点
    /// </summary>
    public class TreeNode
    {
        public TreeNode() {
            Children = new List<TreeNode>();
        }
        [JsonProperty("id")]
        public string Id { get; set; }
        [JsonProperty("text")]
        public string Text { get; set; }
        /// <summary>
        /// open/closed
        /// </summary>
        [JsonProperty("state", NullValueHandling = NullValueHandling.Ignore)]
        public string State { get; set; }
        [JsonProperty("checked", NullValueHandling = NullValueHandling.Ignore)]
        public bool? IsChecked { get; set; }
        /// <summary>
        /// Attributes对应的为json字符串
        /// </summary>
        [JsonProperty("attributes", NullValueHandling = NullValueHandling.Ignore)]
        public dynamic Attributes { get; set; }
        [JsonProperty("children", NullValueHandling = NullValueHandling.Ignore)]
        public List<TreeNode> Children { get; set; }
    }

其中应用了Newtonsoft.Json的属性，可以在生成Json时去掉一下不必要的属性。

2.递归生成树对象

/// <summary>
    /// 递归生成数
    /// </summary>
    /// <param name="rootNode">树的根节点</param>
    /// <param name="listModules">生成数的所有节点</param>
    /// <param name="parentId">父节点id</param>
    private void GetTreeByList(TreeNode rootNode, List<sys_module> listModules, string parentId)
    {
        var listParent = Sys_Module_B.GetChildrenByParentId(listModules, parentId);
        foreach (var item in listParent)
        {
            var listChild = Sys_Module_B.GetChildrenByParentId(listModules, item.ModuleID);
            TreeNode tn = new TreeNode();
            tn.Id = item.ModuleID;
            tn.Text = item.ModuleName + (string.IsNullOrEmpty(item.FunctionCode) ? "" : ("(" + item.FunctionCode + ")"));
            tn.State = "open";
            tn.Attributes = new {GrantedCode =""};//默认设置
　　
            if (listChild != null)
            {
                GetTreeByList(tn, listModules, item.ModuleID, dsRole);
            }
            rootNode.Children.Add(tn);
        }
    }

　　这个方法递归生成了树对象。

3.获取子节点

/// <summary>
        /// 根据父节点，找到所有子菜单module
        /// </summary>
        /// <param name="listModules"></param>
        /// <param name="parentId"></param>
        /// <returns></returns>
        public static List<sys_module> GetChildrenByParentId(List<sys_module> listModules, string parentId)
        {
            List<sys_module> children = (from lm in listModules
                                         where lm.ParentModuleID == parentId
                                         select lm).ToList();
            return children;
        }

4.转换为json

//获取所有的菜单模块节点
        List<sys_module> list = Sys_Module_B.SelectAllModules();
        TreeNode node = new TreeNode();
        GetTreeByList(node, list, moduleId);
        string toJson = JsonTools.SerializeObject(node.Children);

记录一下~