VB
VB学习者的乐园

    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。 

posted on 2020-06-21 08:50  天使爱比目鱼  阅读(355)  评论(0编辑  收藏  举报