VB.Net 中 WithEvents、AddHandler

Public Class Form1    Dim WithEvents cls1 As New ClassTest()  'WithEvents方式    Dim cls2 As New ClassTest()             'AddHandler方式    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load        cls1.Test()                         'WithEvents方式        AddHandler cls2.GetValue, AddressOf cls2GetValue    'AddHandler方式        cls2.Test()        Me.Close()    End Sub    Private Sub cls1_GetVale(ByVal str As String) Handles cls1.GetValue     'WithEvents方式        MsgBox("cls1  " & str)    End Sub    Private Sub cls2GetValue(ByVal str As String)    'AddHandler方式        MsgBox("cls2  " & str)    End SubEnd ClassPublic Class ClassTest    Public Event GetValue(ByVal str As String)    Public Sub Test()        RaiseEvent GetValue("事件例子")    End SubEnd Class