ASP.NET创建XML Web服务全接触(12)- ASP.NET

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ASP.NET创建XML Web服务全接触(12)

出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-11-03 浏览: 47 ::

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ASP.NET创建XML Web服务全接触(11) ASP.NET创建XML Web服务全接触(13)

管理Web服务状态(2)

　　在下面示例中，appMyServiceUsage状态变量被访问来递增其值。下面的代码示例是一个使用两个XML Web服务方法的XML Web服务：ServerUsage和PerSessionServerUage。ServerUsage是一个点击计数器，用于访问ServerUsage XML Web服务方法时计数，而不管客户端如何与XML Web服务方法通信。例如，如果三个客户端连续地调用ServerUsage XML Web服务方法，最后一个接收一个返回值3。而PerSessionServiceUsage则是用于一个特别的客户端会话的计数器。如果三个客户端连续地访问PerSessionServiceUsage，每个客户端都会在第一次调用的时候接收到相同的结果。

[C#]
＜%@ WebService Language="C#" Class="ServerUsage" %＞
using System.Web.Services;

public class ServerUsage : WebService {
　[ WebMethod(Description="Number of times this service has been accessed.") ]
　public int ServiceUsage() {
　　// If the XML Web service method hasn't been accessed,
　　// initialize it to 1.
　　if (Application["appMyServiceUsage"] == null)
　　{
　　　Application["appMyServiceUsage"] = 1;
　　}
　　else
　　{
　　　// Increment the usage count.
　　　Application["appMyServiceUsage"] = ((int) Application["appMyServiceUsage"]) + 1;
　　}
　　return (int) Application["appMyServiceUsage"];
　}

　[ WebMethod(Description="Number of times a particualr client session has accessed this XML Web service method.",EnableSession=true) ]
　public int PerSessionServiceUsage() {
　　// If the XML Web service method hasn't been accessed, initialize
　　// it to 1.
　　if (Session["MyServiceUsage"] == null)
　　{
　　　Session["MyServiceUsage"] = 1;
　　}
　　else
　　{
　　　// Increment the usage count.
　　　Session["MyServiceUsage"] = ((int) Session["MyServiceUsage"]) + 1;
　　}
　　return (int) Session["MyServiceUsage"];
　}
}

[Visual Basic]
＜%@ WebService Language="VB" Class="ServerUsage" %＞
Imports System.Web.Services

Public Class ServerUsage
Inherits WebService

＜WebMethod(Description := "Number of times this service has been accessed.")＞ _
Public Function ServiceUsage() As Integer
' If the XML Web service method hasn't been accessed, initialize
' it to 1.
If Application("appMyServiceUsage") Is Nothing Then
　Application("appMyServiceUsage") = 1
Else
　' Increment the usage count.
　Application("appMyServiceUsage") = _
　CInt(Application("appMyServiceUsage")) + 1
End If
Return CInt(Application("appMyServiceUsage"))
End Function

＜WebMethod(Description := "Number of times a particular client session has accessed this XML Web service method.", EnableSession := True)＞ _
Public Function PerSessionServiceUsage() As Integer
' If the XML Web service method hasn't been accessed,
' initialize it to 1.
If Session("MyServiceUsage") Is Nothing Then
　Session("MyServiceUsage") = 1
Else
　' Increment the usage count.
　Session("MyServiceUsage") = CInt(Session("MyServiceUsage")) + 1
End If
　Return CInt(Session("MyServiceUsage"))
End Function

End Class

ASP.NET创建XML Web服务全接触(11) ASP.NET创建XML Web服务全接触(13)

ASP.NET创建XML Web服务全接触(12)

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