Question

请参阅以下代码：

Imports ComponentAndControl

Public Class Form1

    Delegate Function Compare1(ByVal intNumber1 As Integer, ByVal intNumber2 As Integer) As Boolean
    Public Event e()
    Public Event e2(ByVal o As Object, e As EventArgs)

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles Me.Load

        Dim Test As New TestEventArgs
        Test.Name = "Bert"
        Test.Age = 34

        RaiseEvent e2(Me, Test)
    End Sub

    Public Sub TestHandler4(ByVal o As Object, ByVal e As TestEventArgs) Handles Me.e2
        MsgBox(e.Name)
        MsgBox(e.Age)
    End Sub

    Public Sub TestHandler5(ByVal o As Object, ByVal e As TestEventArgs) Handles Me.e2
        MsgBox(e.Name)
        MsgBox(e.Age)
    End Sub
End Class

Public Class TestEventArgs
    Inherits EventArgs

    Public Name As String
    Public Age As Integer

End Class

首先调用哪个事件处理程序？即TestEventHandler4或TestEventHandler5？是否可以配置它？

Answer 1

在.Net规范中未定义调用MultiCastDelegate时的事件顺序。它们通常按照它们的添加顺序调用，在您的情况下按代码顺序调用，但不要依赖它。

更新

这篇MSDN文章似乎表明调用顺序现在保证是它们被添加的顺序。我实际上没有在实际中验证这一点，我不确定添加自动连线事件的顺序。 https://msdn.microsoft.com/en-us/library/system.multicastdelegate(v=vs.110).aspx

首先调用哪个事件处理程序？

1 个答案: