//增 public string SysUserInfoAdd(T_SYS_USER obj) { using (SysUserBLL UserBll = new SysUserBLL()) { string returnStr = ""; if (!this.IsExistSysUserInfo(obj.USERNAME)) { bool sucess = UserBll.AddSysUserInfo(obj); if (sucess == false) { returnStr = "添加系统用户失败"; } else { //清空即时通讯的缓存 string keyString = "ImInstantLoginUsers"; WCFCache.Current[keyString] = null; } } else { returnStr = "系统用户已经存在"; } return returnStr; } }