.net - 收益 VS 事件表现

Question

我想知道新Yield关键字的性能。这是一个示例代码：

Module Module1

    Private test1 As TestClass
    Private test2 As TestClass

    Private processedValue1 As Integer = 0
    Private processedValue2 As Integer = 0

    Sub Main()

        test1 = New TestClass
        test2 = New TestClass
        AddHandler test2.OnData, AddressOf TestClass_OnData

        Dim s As New Stopwatch
        s.Start()
        For Each item In test1.GetAllEnum
            processedValue1 += 1
        Next
        s.Stop()

        Console.WriteLine("Iterator: " & s.ElapsedMilliseconds)

        s.Restart()
        test2.Start()
        s.Stop()

        Console.WriteLine("Event: " & s.ElapsedMilliseconds)
        Console.ReadLine()

    End Sub

    Private Sub TestClass_OnData(sender As TestClass, value As Integer)
        processedValue2 += 1
    End Sub

End Module

Public Class TestClass

    Public Iterator Function GetAllEnum() As IEnumerable(Of Integer)
        For i As Integer = 0 To 100000000
            Yield i
        Next
    End Function

    Public Sub Start()
        For i As Integer = 0 To 100000000
            RaiseEvent OnData(Me, i)
        Next
    End Sub

    Public Event OnData(sender As TestClass, value As Integer)

End Class

结果是：

Iterator: 4271
Event: 1028

正如我们所见，使用Yield比传统实现慢了大约 4 倍。

有没有办法提高性能？