WebMethod Session

 [WebMethod(EnableSession = true)]
        public static string SayHello()
        {
             LxUserContext depno = HttpContext.Current.Session["UserContext"] as LxUserContext;
             string depnos = depno.User.Department.ID;
              .......

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net;
using CityMgr;
using CityMgr.Base;

namespace WebApp
{
    /// <summary>
    /// 用户上下文
    /// </summary>
    [Serializable]
    public class LxUserContext
    {
        /// <summary>
        /// 当前用户
        /// </summary>
        public LxPerson User { get; set; }
        /// <summary>
        /// 当前用户拥有的权限列表
        /// </summary>
        public List<LxAuth> HoldAuth { get; set; }
        /// <summary>
        /// 登录时间
        /// </summary>
        public DateTime LoginTime { get; set; }
        /// <summary>
        /// 客户端IP地址
        /// </summary>
        public string IP { get; set; }

        /// <summary>
        /// 验证权限
        /// </summary>
        /// <param name="authId">权限ID</param>
        /// <returns>是否拥有此权限</returns>
        public bool ValidateAuth(string authId)
        {
            return HoldAuth.Contains(new LxAuth() { ID = authId });
        }

        /// <summary>
        /// 验证权限
        /// </summary>
        /// <param name="authIds">权限ID列表</param>
        /// <returns>是否拥有此权限</returns>
        public bool ValidateAuth(string[] authIds)
        {
            bool result = false;
            foreach (var auth in authIds)
            {
                if (HoldAuth.Contains(new LxAuth() { ID = auth }))
                    result = true;
                 break;
            }
            return result;
        }

        /// <summary>
        /// 获取当前用户登录上下文
        /// </summary>
        /// <returns>用户登录上下文</returns>
        [AjaxPro.AjaxMethod(AjaxPro.HttpSessionStateRequirement.Read)]
        public static LxUserContext GetCurUserContext()
        {
            var obj = HttpContext.Current.Session["UserContext"] as LxUserContext;
            obj.User.Department.LoadData();
            return obj;
        }

    }
}