WEB SERVICES狀態管理
在默認情況下,.NET下的WEB SERVICES是無狀態的.不過可以用ASP.NET提供的狀態管理
那就是SESSION和APPLICATION.這使得WEB SERVICES下狀態管理變得簡單了,只需使用WEBMETHOD屬性的ENABLESESSION子屬性就可[WEBMETHOD(ENABLESESSION=TRUE)]
服務端代碼如下:
[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;
}
先創建一個CLIENT類,用於表示客戶端連接的次數,GetClientState()方法用於返回當前用戶的狀態.
客戶端代碼如下:
partial class Form1 : Form
{
webstate.Service ws ;
webstate.client c;
public Form1()
{
InitializeComponent();
ws = new testwebstate.webstate.Service();
ws.CookieContainer = new System.Net.CookieContainer();
//設置COOKIE容器,以便代理對像能正確使用COOKIE來提供狀態信息
}
private void button1_Click(object sender, EventArgs e)
{
ws.click();//每點擊一次,當前用戶的CLIENT STATE的REQUEST就++
c = ws.GetClientState();//獲取狀態信息
MessageBox.Show("you have click" + c.requsest + "times");
}
}
以上的是SEESION的狀態管理,下面介紹APPLICATION.
服務端代碼如下:
[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)//這裡用的是傳遞對象的引用
{
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;
}
客戶端代碼如下:
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);//這裡用的是傳遞對象的引用
this.richTextBox1.Text = s.GetHistory();
}
}
對於WEB SERVICES而言,APPLICATION屬性總是可用的,APPLICATION返回HTTPAPPLICATIONSTATE類
的一個實例,它能存儲來自任何客戶端的可訪問的"名稱/值"對.
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