ASP.NET创建XML Web服务全接触(12)
类别: ASP.NET教程 
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 |
