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）

privatevoidSMT(HttpContext context)

 {

  stringSqlConnection82 = System.Configuration.ConfigurationManager.AppSettings["LocalConnectionString"];

  stringpath = context.Server.MapPath(@"~/CISWeb/SMT_SOP");

  stringid =string.Empty;

  List filesNameList = getFiles(path);

  if(filesNameList.Count > 0)

   context.Response.Write(ListToJson(filesNameList,id));

  else

  {

   context.Response.Write("0");

  } 

 }

 ///

 ///

 ///

 privatestaticList getFiles(stringpath)

 {

  DirectoryInfo SMT_SOP =newDirectoryInfo(path);

  List allFileList =newList();

  DirectoryInfo[] allDir = SMT_SOP.GetDirectories();//获取文件夹数量

  foreach(DirectoryInfo dinallDir)

  {

   allFileList.Add("0|"+ d.Name);

  }

  FileInfo[] allFile = SMT_SOP.GetFiles();//获取文件数量

  foreach(FileInfo fiinallFile)

  {

   allFileList.Add("1|"+ fi.Name);

  }

  returnallFileList;

 }

 ///

 ///

 /// 第一次调用这个方法的时候，id=""

 ///

 publicstringListToJson(List filesNameList,stringid)

 {

  StringBuilder sb2 =newStringBuilder();

  sb2.Append("[");

  for(inti = 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("]"); 

  returnsb2.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

    vartreeData = eval(result);

    $("#tt").tree({

     data: treeData})

    }

   })