‘首先我们定义一个类，主要用于得到某个IP地址的Service的状态信息，并在服务状态不正常时触发另一线程得到该系统的详细信息。
Imports System.ServiceProcess
Imports System.Xml
Imports System.Threading
Public Class GetStatus
Private IServiceName As String ‘服务的名称
Private IMachineIP As String ‘IP地址
Private ITable As String ‘在DATESET中的表名
'构造函数
Sub New(ByVal Ip As String, ByVal SvcName As String, ByVal updatetable As String)
IMachineIP = Ip
IServiceName = SvcName
ITable = updatetable
End Sub
‘每个线程所运行的方法，用于得到服务的状态，如果状态不正常则触发另一线程得到该IP的信息
Sub GetStausF()
Dim ServiceP As New ServiceController() ‘实例化一个ServiceController类
ServiceP.MachineName = IMachineIP
ServiceP.ServiceName = IServiceName
Dim myRow As DataRow
Dim status As String
Dim Run As Boolean = False
myRow = ds.Tables(ITable).NewRow
Try
If ServiceP.Status.ToString <> "Running" Then
status = ServiceP.Status.ToString‘如果状态不是RUNNING则将状态赋予字符串变量
Else
Run = True ‘如果状态为RUNNING,则不做任何事
End If
Catch er As Exception ‘以下处理取得状态时候发生的异常
status = Left(er.Message, 35)
If InStr(status, "Service Control Manager") = 0 Then
status = "Not installed or open service failed" ‘没有安装该服务
ElseIf InStr(er.Message, "Manager") > 0 Then
status = "Can not detected" ‘服务的状态不可得
End If
End Try
ServiceP.Close() ‘关闭ServiceController实例
‘以下判断如果状态不是RUNNING,则记录该系统，并触发线程得到它的详细信息。
If Not Run Then
myRow("msg") = status
myRow("ip") = IMachineIP
SyncLock GetType(AddRow) ‘为保证多线程情况下，对DataSet只有一个写操作，锁定AddRow类
Dim AddRowIns As New AddRow(myRow) '将IP和状态通过我们自己写的AddRow类插入DataSet
End SyncLock
‘触发另一线程取得机器信息
Dim HostInfo2 As New HostInfo(IMachineIP)
Dim HostThr2 As New Thread(New ThreadStart(AddressOf HostInfo2.sysInfo))
HostThr2.Start()
SyncLock GetType(HostInfoThreadCounter)
HostInfoThreadCounter.counter += 1 ‘启动线程数加1
End SyncLock
End If

SyncLock GetType(StoppCounter)
StopThr.AddStop()
End SyncLock
End Sub
End Class
‘该类只有一个方法，就是将停止的线程数减1
Class StoppCounter
Sub AddStop()
ThreadCounterStopped = ThreadCounterStopped + 1
End Sub
End Class
‘此类用于将已有的行插入DataSet
Class AddRow
‘第一个构造函数，以构造好的行为输入参数
Sub New(ByVal row As DataRow)
Try
ds.Tables(0).Rows.Add(row)
Catch ee As Exception

End Try
End Sub
‘第二个构造函数，以机器名用户名等字符串为参数，更新已有的行
Sub New(ByVal IP As String, ByVal user As String, ByVal hostname As String, ByVal Mac As String, ByVal domain As String, ByVal timeout As Char)
Dim RowTimeOut As DataRow
Try
For Each RowTimeOut In ds.Tables(0).Select("IP='" & IP & "'")
RowTimeOut.Item("LastUID") = user
RowTimeOut.Item("Name") = hostname
RowTimeOut.Item("Mac") = Mac
RowTimeOut.Item("Domain") = domain
RowTimeOut.Item("Timeout") = timeout 'Set timeout flag to this item
Exit For 'just run once
Next
Catch er As Exception

End Try
End Sub
End Class

‘由于篇幅限制，这里省略了根据IP取得机器信息的类的代码。

Imports System.Threading ‘用于支持多线程
Imports System.Xml ‘用于分析XML格式的参数文件
Imports System.Data ‘用于保存结果到数据库
Module Module1
Public ds As New DataSet()
Public conn1 As SqlClient.SqlConnection ‘数据库连接
Public ipf As String ‘IP列表文件名
Public dbf As String ‘数据库信息文件
Public ThreadCounterStopped As Integer
Public StopThr As New StoppCounter()
Sub Main() ‘程序主程序
Dim machineIP As String
Dim iplistF As New Xml.XmlDocument()
Dim iplist As Xml.XmlNode
Dim ipitem As Xml.XmlNode
Dim DBinfoF As New Xml.XmlDocument()
Dim DBinfo As Xml.XmlNode
Dim LanID As String
Dim i As Integer
Dim timestart As Integer
Dim ThreadCounterStarted As Integer

ThreadCounterStarted = 0
ThreadCounterStopped = 0
Dim server As String
Dim database As String
Dim uid As String
Dim pwd As String
Dim table As String
Dim connstr, connstr1 As String
Dim ServiceName As String
Dim Purgestr As String
Try
DBinfoF.Load(dbf) ‘读取数据库信息文件
Catch nodb As Exception
MsgBox(nodb.Message & "Wrong DB info file name.")
Exit Sub
End Try
Try
iplistF.Load(ipf) ‘读取IP列表文件
Catch noip As Exception
MsgBox(noip.Message & "Wrong IP list file name.")
Exit Sub
End Try
‘分析数据库信息文件
DBinfo = DBinfoF.ChildNodes(0)
server = DBinfo.ChildNodes(0).InnerText
database = DBinfo.ChildNodes(1).InnerText
uid = DBinfo.ChildNodes(2).InnerText
pwd = DBinfo.ChildNodes(3).InnerText
ServiceName = DBinfo.ChildNodes(4).InnerText
table = DBinfo.ChildNodes(4).Attributes(0).Value
‘根据分析所得，构造连接字符串
connstr1 = "server=" & server & ";database=" & database & ";uid=" & uid & ";password=" & pwd
conn1 = New SqlClient.SqlConnection(connstr1) ‘实例化数据库连接
conn1.Open() ‘打开数据库连接

Dim sa As SqlClient.SqlDataAdapter = New SqlClient.SqlDataAdapter("select * from " & table, conn1)
Dim combu As New SqlClient.SqlCommandBuilder(sa)
sa.Fill(ds, table) ‘填充DataSet
ds.Clear() ‘清空旧的数据

Dim IPAddress As String
‘分析IP列表文件
iplist = iplistF.ChildNodes(0)
Dim Ai As Integer
Dim ipexcepCount As Integer
Dim ipexcep As Xml.XmlNode
For Each ipitem In iplist.ChildNodes
Dim Excep(2, 83) As Integer
LanID = ipitem.Attributes(0).Value‘得到网络ID
For i = 2 To 254 '从2到254，根据每个网络ID构造IP地址
Ai = 0
‘以下判断是为了跳过保留地址段
If ipitem.HasChildNodes Then
ipexcepCount = ipitem.ChildNodes.Count
ReDim Excep(2, ipexcepCount - 1)
For Each ipexcep In ipitem.ChildNodes
Excep(0, Ai) = CInt(ipexcep.Attributes(0).Value)
Excep(1, Ai) = CInt(ipexcep.Attributes(1).Value)
Ai = Ai + 1
Next
End If
For Ai = 0 To ipexcepCount - 1
If i >= Excep(0, Ai) And i <= Excep(1, Ai) Then
Console.WriteLine("跳过保留地址： " & LanID & i.ToString)
GoTo SkipIP
End If
Next
machineIP = LanID & i.ToString ‘IP地址
‘以下触发线程以，得到服务状态
Dim getSt As New GetStatus(machineIP, ServiceName, table)
Dim GetStThread As New Thread(New ThreadStart(AddressOf getSt.GetStausF))
GetStThread.Start()
ThreadCounterStarted = ThreadCounterStarted + 1‘启动线程数加1
Console.WriteLine("线程" & machineIP & " 启动。检测 " & ServiceName)
‘每启动100个线程，程序主线程停止15秒，避免太多线程造成内存溢出
If (ThreadCounterStarted Mod 100) = 0 Then
Console.WriteLine("等待 .......")
Thread.CurrentThread.Sleep(15000)
GC.Collect() 'force garbage collection to aviod outOfMemory when run with long IP list
End If
SkipIP:
Next
Next
Console.WriteLine("Exiting program ...") '所有线程都已触发
Finish:
Thread.CurrentThread.Sleep(5000) ‘以下程序等待所有线程结束
GC.Collect()
If ThreadCounterStopped = ThreadCounterStarted And HostInfoThreadCounter.counter = HostInfoThreadCounter.counterSTOP Then‘如果触发线程等于结束线程

Dim row As Data.DataRow
For Each row In ds.Tables(table).Rows
row.Item("SysTime") = Now
Next
Purgestr = "delete " & table
Dim com1 As New SqlClient.SqlCommand(Purgestr, conn1)
com1.ExecuteNonQuery() ‘删除旧记录
sa.InsertCommand = combu.GetInsertCommand
sa.Update(ds, table) ' 将新记录写入数据库
Else
GoTo Finish ' goto finish and wait another 30 seconds
End If
End Sub