基类:
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
用户自定义控件ucOrder中设置状态信息:
Public Class ucOrder
Private objuserFun As New userFun
objuserFun.PnlStatus = "新建订单!"
End Class
主窗体中显示状态信息:
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
总结:VB中的共享事件感觉跟C#中的静态事件差不多。