1
我做了简单的网页。当它用查询字符串调用时，它会增加应用程序变量。 3秒后，线程完成变量减少。更改应用程序变量没有给予正确的结果
问题是，当我打开2个浏览器页面（或mozilla）并从一个页面调用并从其他页面获取结果时，一切正常。但是当我使用多线程测试应用程序拨打200或更多的电话时，号码不会回到零。它不会像240或20一样保持相同的数字。每次它不同但不是零。
page_load事件准备自动化进程。我的多线程应用程序调用此页面，如http://localhost:4444/test.aspx?i=anything，因此页面automaticallu将1添加到变量“x”并启动线程。变量应该在3秒后减1，总数应该为零。但不是 ？？？
重要：当我在我的测试应用程序中使用1个线程来调用此网页时，它“起作用”很好。例如，它有时会达到680并返回到零。如果我使用2个线程来调用页面，那么结果总是“不一致”。
有趣的是不是如果我使用SQL Server，并保持变量存在，并增加与
UPDATE test SET count=count + 1
UPDATE test SET count=count - 1
我看不出有什么问题，即使有20个并发连接/减少使用应用程序变量。
有什么建议吗？
Partial Class test
Inherits System.Web.UI.Page
Dim _resetEvent As New AutoResetEvent(False)
Protected Sub cmdWriteVariable_Click(sender As Object, e As EventArgs) Handles cmdWriteVariable.Click
Response.Write(Application("x").ToString)
End Sub
Protected Sub cmdIncreaseValue_Click(sender As Object, e As EventArgs) Handles cmdIncreaseValue.Click
If Application("x") Is Nothing Then Application("x") = 0
Application.Lock()
Application("x") = CInt(Application("x").ToString) + 1
Application.UnLock()
Response.Write(Application("x").ToString)
End Sub
Protected Sub Async_start()
Dim workerObject As New myTestAsyncClass(_resetEvent)
workerObject.ad = "anyname"
Dim ctx As HttpContext = HttpContext.Current
Dim workerThread As New Thread(New ThreadStart(Sub()
HttpContext.Current = ctx
workerObject.DoWork2(ctx)
End Sub))
workerThread.Start()
End Sub
Protected Sub cmdReset_Click(sender As Object, e As EventArgs) Handles cmdReset.Click
Application("x") = 0
End Sub
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
If Application("x") Is Nothing Then Application("x") = 0
If Request.QueryString("i") IsNot Nothing Then
Application.Lock()
Application("x") = CInt(Application("x").ToString) + 1
Application.UnLock()
Async_start()
End If
End Sub
End Class
，这是线程类：
Imports Microsoft.VisualBasic
Imports System.Threading
Public Class myTestAsyncClass
Dim _resetEvent As AutoResetEvent = Nothing
Public ad As String
Public Sub New(resetEvent As AutoResetEvent)
_resetEvent = resetEvent
End Sub
Public Sub DoWork2(state As Object)
Try
Dim context As HttpContext = TryCast(state, HttpContext)
System.Threading.Thread.Sleep(3000)
Dim x As Integer = CInt(context.Application("x").ToString)
x = x - 1
context.Application.Lock()
context.Application("x") = x.ToString
context.Application.UnLock()
Finally
_resetEvent.[Set]()
End Try
End Sub
End Class
和aspx页面，以防万一：其简单的3个按键。写入变量，重置为零并增加1.打开2个浏览器，单击多次增加并从其他浏览器单击写入变量按钮。你会看到它的工作正常。可以说10和3秒后变量变为零。
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="test.aspx.vb" Async="true" Inherits="test" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="cmdIncreaseValue" runat="server" Text="increasevalue" />
<br />
<br />
<asp:Button ID="cmdWriteVariable" runat="server" Text="write app variable" />
<br />
<br />
<asp:Button ID="cmdReset" runat="server" Text="set varable to 0" />
</div>
</form>
</body>
</html>