详解Jquery EasyUI tree 的异步加载（遍历指定文件夹，根据文件夹内的文件生成tree）

private void SMT(HttpContext context) {  string SqlConnection82 = System.Configuration.ConfigurationManager.AppSettings["LocalConnectionString"];  string path = context.Server.MapPath(@"~/CISWeb/SMT_SOP");  string id = string.Empty;  List<string> filesNameList = getFiles(path);  if (filesNameList.Count > 0)   context.Response.Write(ListToJson(filesNameList,id));  else  {   context.Response.Write("0");  }   } /// <summary> /// 范围指定目录下的 文件夹/文件 数量 /// </summary> /// <param name="path"></param> /// <returns></returns> private static List<string> getFiles(string path) {  DirectoryInfo SMT_SOP = new DirectoryInfo(path);  List<string> allFileList = new List<string>();  DirectoryInfo[] allDir = SMT_SOP.GetDirectories();//获取文件夹数量  foreach (DirectoryInfo d in allDir)  {   allFileList.Add("0|" + d.Name);  }  FileInfo[] allFile = SMT_SOP.GetFiles();//获取文件数量  foreach (FileInfo fi in allFile)  {   allFileList.Add("1|" + fi.Name);  }  return allFileList; } /// <summary> /// 遍历指定文件夹，根据文件夹内的文件返回JSON /// </summary> /// <param name="filesNameList"></param> /// <param name="id">第一次调用这个方法的时候，id=""</param> /// <returns></returns> public string ListToJson(List<string> filesNameList,string id) {   StringBuilder sb2 = new StringBuilder();  sb2.Append("[");  for (int i = 0; i < filesNameList.Count; i++)  {     if (filesNameList[i].ToString().Split('|')[0] == "0")   {     sb2.Append("{ /"id/":" +id+ (i + 1).ToString() + ",/"text/":/"" + filesNameList[i].ToString().Split('|')[1] + "/",/"state/":/"closed/",/"children/": [");        sb2.Append("]},");       }   else   {        sb2.Append("{/"id/":"+id + (i + 1).ToString() + ",/"text/":/"" + String.Format(filesNameList[i].ToString().Split('|')[1]) + "/"},");       }  }  sb2.Remove(sb2.Length - 1, 1);  sb2.Append("]");    return sb2.ToString(); }

$.ajax({   type: "post",   url: "../../ajax/Handler.ashx?action=SMT",   data: {},   success: function (result) {    $("#menuDiv").dialog("open");//jQuery UI中的模态窗口    var treeData = eval(result);    $("#tt").tree({     data: treeData})    }   })