VB.NET在基类中定义共享事件（类似于C#中的静态事件）

Public Class userFun
    Private Shared _PnlStatus As String ‘必须设为共享字段，如果不设为Shared，将不能传递字符串内容
    Public Delegate Sub EventHandler()
    Public Shared Event PnlStatusChanged As EventHandler ’共享事件，如果不设为Shared，将不能触发主窗体中的事件

    Public Property PnlStatus As String ‘类属性
        Get
            Return _PnlStatus
        End Get
        Set(value As String)
            _PnlStatus = value
            RaiseEvent PnlStatusChanged() ’触发事件
        End Set
    End Property
End Class

Public Class ucOrder    
   Private objuserFun As New userFun
   objuserFun.PnlStatus = "新建订单！"
End Class

Public Class frmAdmin
    Private WithEvents objuserFun As New userFun ’添加WithEvents，显式调用事件
    Private Sub objuserFun_PnlStatusChanged() Handles objuserFun.PnlStatusChanged
       PnlStatus.Text = objuserFun.PnlStatus ’主窗体显示状态信息
    End Sub
End Class