在BeforeOpenProject增加代码
'禁止多开
static mu As system.threading.mutex
Dim sucess As Boolean = False
mu=new system.threading.mutex(True,"XXXXXXXX",sucess) ‘XXXXXXXX是你的程序名称
If not sucess Then
MessageBox.show("系统已经在运行,可退出后重新登录!","提示",MessageBoxButtons.OK,messageboxicon.Information)
e.cancel=True
End If