防止同一个程序多次运行。
'*****************方法一：防止程序多次打开*****************' 函数名： IsInstanceRunning ' 功 能： 判断工程是否已运行 ' 参 数： 无 ' 返回值： True 已运行 False 未运行 '******************************************************* Public Function IsInstanceRunning() As Boolean Dim current As Process = System.Diagnostics.Process.GetCurrentProcess() Dim processes As Process() = System.Diagnostics.Process.GetProcessesByName(current.ProcessName) 'Loop through the running processes in with the same name Dim p As Process For Each p In processes 'Ignore the current process If p.Id <> current.Id Then 'Make sure that the process is running from the exe file. If System.Reflection.Assembly.GetExecutingAssembly().Location.Replace("/", "") = current.MainModule.FileName Then 'Return the other process instance. Return True End If End If Next 'No other instance was found, return null. Return FalseEnd Function 'RunningInstance

'*****************方法二：防止程序多次打开*****************Imports System.Diagnostics If UBound(Process.GetProcessesByName(Process.GetCurrentProcess.ProcessName)) _ > 0 Then Eixt Sub'Process.GetCurrentProcess.ProcessName 获取当前运行程序的名称。