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ASP.NET创建XML Web服务全接触(12)
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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 |
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