Web Service学习笔记：状态管理

在默认情况下,.NET下的WEB SERVICES是无状态的.不过可以用ASP.NET提供的状态管理，那就是SESSION和APPLICATION.

这使得WEB SERVICES下状态管理变得简单了,只需使用WEBMETHOD属性的ENABLESESSION子属性就可[WEBMETHOD(ENABLESESSION=TRUE)]。

服务端代码如下:

 

        [WebMethod(EnableSession = true)]
        public client GetClientState()
        {
            cstate = (client)Session["clientstate"];
            if (cstate == null)
            {
                cstate = new client();
                Session["clientstate"] = cstate;
            }
            return cstate;
        }
        [WebMethod(EnableSession = true)]
        public void click()
        {
            client c = this.GetClientState();
            c.requsest++;
        }
        public class client
        {
            public int requsest;
        }

 

先创建一个CLIENT类,用于表示客户端连接的次数,GetClientState()方法用于返回当前用户的状态.

客户端代码如下:

 

 

CODE:
        public sealed class e1 : ApplicationException
        {
            public e1(string message)
                : base(message)
            {
                //描述该错误的信息,不做任何事,依赖于基类
                // TODO: Add constructor logic here
                //
            }
        }
        public sealed class e2 : ApplicationException
        {
            public e2(string message)
                : base(message)
            {
                //描述该错误的信息,不做任何事,依赖于基类
                // TODO: Add constructor logic here
                //
            }
        }
        partial class Form1 : Form
        {
            webstate.Service ws;
            webstate.client c;
            public Form1()
            {
                InitializeComponent();
                ws = new testwebstate.webstate.Service();
                ws.CookieContainer = new System.Net.CookieContainer();
                //设置COOKIE容器,以便代理对象能正确使用COOKIE来提供状态信息
            }
            private void button1_Click(object sender, EventArgs e)
            {
                ws.click();//每点击一次,当前用户的CLIENT STATE的REQUEST就++
                c = ws.GetClientState();//获取状态信息
                MessageBox.Show("you have click" + c.requsest + "times");
            }
        }
        //以上的是SEESION的状态管理,下面介绍APPLICATION.服务端代码如下:
        [WebServiceBinding(ConformanceClaims = WsiClaims.BP10, EmitConformanceClaims = true)]
        public class Service : System.Web.Services.WebService
        {
            ArrayList clist;
            [WebMethod]
            public string GetHistory()
            {
                StringBuilder xbuider = new StringBuilder();//要添加USING SYSTEM.TEXT;
                clist = (ArrayList)Application["client"];
                if (clist == null)
                {
                    clist = new ArrayList();
                    Application["client"] = clist;
                }
                foreach (client c in clist)
                {
                    xbuider.Append(c.name + "" + c.request + "" + "\r\n");
                }
                return xbuider.ToString();
            }
            [WebMethod]
            public void click(ref client c)//这里用的是传递对象的引用
            {
                clist = (ArrayList)Application["client"];
                if (clist == null)
                {
                    clist = new ArrayList();
                    Application["client"] = clist;
                }
                clist.Add(c);
            }
        }
        public class client
        {
            public int request;
            public string name;
        }

 

 

客户端代码如下:

 

        partial class Form1 : Form
        {
            webstate.client c;
            public Form1()
            {
                InitializeComponent();
                c = new testwebstate2.webstate.client();
                c.name = "jisiki";
            }
            private void button1_Click(object sender, EventArgs e)
            {
                c.request++;
                webstate.Service s = new testwebstate2.webstate.Service();
                s.click(ref c);//这里用的是传递对象的引用
                this.richTextBox1.Text = s.GetHistory();
            }
        }

 

对于WEB SERVICES而言,APPLICATION属性总是可用的,APPLICATION返回HTTPAPPLICATIONSTATE类
的一个实例,它能存储来自任何客户端的可访问的"名称/值"对.