vb.net判断已启动,vb运行时默认启动的窗体是

vb.net 怎样判断某个窗体是否打开

Dim F1 As New Datasystem.Form2 '实例化窗体

For Each na As Form In Application.OpenForms '打开窗体的集合

If na.ProductName = F1.ProductName AndAlso na.Name = F1.Name 0 Then '判断程序集的产品名称和窗体名称是否已存在打开的窗体中

If na.WindowState = FormWindowState.Minimized Then '判断窗体是否最小化

na.WindowState = FormWindowState.Normal '还原窗体

End If

na.Activate() '激活窗体

Return '返回

End If

Next

F1.Show() '如果没有打开的窗体中未找到，重新打开窗体

相关问答

Q1: vb.net 怎么判断当前程序是否正在运行？

Imports System.Runtime.InteropServices

Module Module1

Sub Main()

Dim instance As Process = RunningInstance()

If instance IsNot Nothing Then

ShowWindowAsync(instance.MainWindowHandle, 3) '调用api函数，正常显示窗口

Return

End If

Dim F1 As New Form1

Application.Run(F1) '显示窗体

End Sub

DllImport("User32.dll")

Public Function ShowWindowAsync(ByVal hWnd As System.IntPtr, ByVal cmdShow As Integer) As Boolean

End Function

Private Function RunningInstance() As Process '返回进程中已经打开的程序

Dim current As Process = Process.GetCurrentProcess()

Dim processes As Process() = Process.GetProcessesByName(current.ProcessName)

For Each process As Process In processes

If process.Id current.Id Then

If process.MainModule.FileName = current.MainModule.FileName Then

Return process

End If

End If

Next

Return Nothing

End Function

End Module

Q2: vb.net 检查程序已运行

这个提供进程即可以判断程序是否已经启动

这个是最一般的方法了

希望能帮到你