public static List<TC_DictionaryInfo> DInfo = new List<TC_DictionaryInfo>();
/// <summary>
/// TreeView视图
/// </summary>
/// <returns></returns>
public ActionResult May(string TypeCode,int parentId)
{
ViewBag.TypeCode = TypeCode;
ViewBag.ParentId = parentId;
return View();
}
[HttpPost]
public ActionResult GetTreeData(string TypeCode,int parentId)
{
List<TC_DictionaryInfo> DInfo = dbll.GetModelList("TypeCode="+TypeCode);
return Json(GetChildNodes(0,new NodeModel(){}, DInfo).nodes);
}
///<summary>
/// GetChildNodes方法，此方法使用递归
/// </summary>
/// <param name="parentId"></param>
/// <returns></returns>
public NodeModel GetChildNodes(int parentId,NodeModel childnodestr,List<TC_DictionaryInfo> DInfo)
{
List<TC_DictionaryInfo> DictionaryList = DInfo.Where(e => Convert.ToInt32(e.ParentId) == parentId).ToList();
for (int i = 0; i < DictionaryList.Count; i++)
{
NodeModel NewNode = new NodeModel();
NewNode.DicId = DictionaryList[i].DicId;
NewNode.text = DictionaryList[i].DICName;
NewNode.ParentId = DictionaryList[i].ParentId;
childnodestr.nodes.Add(NewNode);
GetChildNodes(NewNode.DicId, NewNode, DInfo);
}
return childnodestr;
}

<script type="text/javascript">
var typecode = @ViewBag.TypeCode;
var parentid = @ViewBag.ParentId;
$(function() {
$.ajax({
type: 'Post',
url: '/Type/GetTreeData',
data:{
TypeCode:typecode,
ParentId:parentid,
},
//data: para,
dataType: 'json',
async: false,
success: function (data) {
var defaultData = eval(data);
//var defaultData = data;
$('#treeview4').treeview({
color: "#428bca",
data: defaultData
});
},
error: function (err) {
alert('不好意思，数据忘记带上了。。。');
}
});
</scipt>

public ActionResult May(string TypeCode,int parentId)
{
ViewBag.TypeCode = TypeCode;
ViewBag.ParentId = parentId;
return View();
} 
public ActionResult GetTreeData()
{
//创建jsondata对象
StringBuilder jsonData = new StringBuilder();
//拼接json字符串 开始{
jsonData.Append("[");
//调用GetChildNodes方法，默认传参试为0（0表示根节点菜单选项）
jsonData.Append(GetChildNodes(0));
//闭合Node子类数组 ]
jsonData.Append("]");
//返回json字符串
return Json(jsonData.ToString());
}
/// <summary>
/// GetChildNodes方法，此方法使用递归
/// </summary>
/// <param name = "parentId" ></ param >
/// < returns ></ returns >
public string GetChildNodes(int parentId)
{
//为DInfo赋值（DInfo承载页面所需的值（间接将值传给页面）），查询所有的数据
List<TC_DictionaryInfo> DInfo = dbll.GetModelList("");
//创建ChiidNodeStr变量
StringBuilder ChildNodeStr = new StringBuilder();
//查询符合条件的数据（ParentId=0），DictionaryList接收数据
List<TC_DictionaryInfo> DictionaryList = DInfo.Where(e => Convert.ToInt32(e.ParentId) == parentId).ToList();
//循环DictionaryList为TreeView所需数据分层级（即子类、父类等节点分开）
for (int i = 0; i < DictionaryList.Count; i++)
{
//Nodes数组开始 {
ChildNodeStr.Append("{");
//实例化NewNode
NodeModel NewNode = new NodeModel();
//分别为字段赋值
NewNode.DicId = DictionaryList[i].DicId;
NewNode.text = DictionaryList[i].DICName;
NewNode.ParentId = DictionaryList[i].ParentId;
//将要显示的字段拼接
ChildNodeStr.Append("text:'" + NewNode.text + "',");
//超链接地址（此处设置为空链接#）
ChildNodeStr.Append("href:'#parent1',");
ChildNodeStr.Append("tags:['0']");
//拼接完毕子类分层，去掉最后多余的符号（,）
string ChildNodes = GetChildNodes(NewNode.DicId).Trim(',');
//判断父类下是否有子类，如果有子类放到Nodes里，如果没有不让他显示为数组形式“[]”
if (ChildNodes != string.Empty)
{
//拼接Json字符串格式
ChildNodeStr.Append(",");
ChildNodeStr.Append("nodes:[");
ChildNodeStr.Append(ChildNodes);
ChildNodeStr.Append("]");
}
//结尾加上}, 
ChildNodeStr.Append("},");
}
//返回Json字符串，并将,去掉
return ChildNodeStr.ToString().Trim(',');
}

var defaultData = eval(data);