浅析jQuery EasyUI中的tree使用指南(3)

public class getTreeNode : IHttpHandler, System.Web.SessionState.IRequiresSessionState
{
    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        DataTable dt = (DataTable)context.Session["viewmaintain"];
        string parentId = string.Empty;
        string resultStr = string.Empty;
        string attributes = string.Empty;
        string colName = string.Empty;
        string sql = string.Empty;
        string Casname = string.Empty;
        bool colt = false;
        string icon = "icon-profile";
        if (!string.IsNullOrEmpty(context.Request.QueryString["pid"]))
        {
            parentId = context.Request.QueryString["pid"].ToString();
        }
        if ((!string.IsNullOrEmpty(context.Request.QueryString["coln"])) && (string.IsNullOrEmpty(context.Request.QueryString["casn"])))
        {
            colName = HttpUtility.UrlDecode(context.Request.QueryString["coln"].ToString());
            if (dt != null)
            {
                bool pt = true;
                while (pt)
                {
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        Casname = dt.Rows[i]["view_colname"].ToString();
                        if (dt.Rows[i]["view_colname"].ToString() == colName)
                        {
                            if (dt.Rows[i]["view_cas"].ToString() != null&&dt.Rows[i]["view_cas"].ToString() !="")
                            {
                                colName = dt.Rows[i]["view_cas"].ToString();
                            }
                            else
                            {
                                colt = true;
                                sql = dt.Rows[i]["view_sql"].ToString();
                                pt = false;
                            }
                            break;
                        }
                    }
                }
            }
        }
        if ((!string.IsNullOrEmpty(context.Request.QueryString["casn"])) && (!string.IsNullOrEmpty(context.Request.QueryString["coln"])))
        {
           string casnName = HttpUtility.UrlDecode(context.Request.QueryString["casn"].ToString());
           colName = HttpUtility.UrlDecode(context.Request.QueryString["coln"].ToString());
            if (dt != null)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    Casname = dt.Rows[i]["view_colname"].ToString();
                    if (dt.Rows[i]["view_cas"].ToString() == casnName && casnName != colName)
                    {
                        colt = true;
                        sql = dt.Rows[i]["view_sql"].ToString();
                        break;
                    }
                }
            }
        }
        try
        {
            if (parentId != "" && colt == true)
            {
                //此处省略得到数据列表的代码
                List<TreeInfo> ltree = DAL_TreeInfo.GetItemValue(parentId, sql);
                resultStr = "";
                resultStr += "[";
                if (ltree.Count > 0)
                {
                    foreach (TreeInfo item in ltree)
                    {
                        attributes = "";
                        attributes += "{\"cas\":\"" + Casname;
                        attributes += "\",\"val\":\"" + item._text + "\"}";
                        resultStr += "{";
                        resultStr += string.Format("\"id\": \"{0}\", \"text\": \"{1}\", \"iconCls\": \"{2}\", \"attributes\": {3}, \"state\": \"closed\"", item._id, item._text, icon, attributes);
                        resultStr += "},";
                    }
                    resultStr = resultStr.Substring(0, resultStr.Length - 1);
                }
                resultStr += "]";
            }
            else
            {
                resultStr = "[]";
            }
        }
        catch (Exception ex)
        {
            resultStr = "出错";
        }
        context.Response.Write(resultStr);
    }
    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

 
　　关键性的代码都已经在上面了，目前也就只能想到这种办法来解决了，有时间的话可以给tree扩展一下，添加一个清除子节点的方法，这样应该实现起来会更容易方便。

　　小弟在此献丑了，不知道各位专家、同仁有没有遇到类似的问题，或者有其它更好的解决办法，欢迎在这交流。

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