作者:VB.NET开发
项目:Syste
Module Module1
Sub Main()
Dim c As Counter = New Counter(New Random().Next(10))
AddHandler c.ThresholdReached, AddressOf c_ThresholdReached
Console.WriteLine("press 'a' key to increase total")
While Console.ReadKey(True).KeyChar = "a"
Console.WriteLine("adding one")
c.Add(1)
End While
End Sub
Sub c_ThresholdReached(sender As Object, e As EventArgs)
Console.WriteLine("The threshold was reached.")
Environment.Exit(0)
End Sub
End Module
Class Counter
Private threshold As Integer
Private total As Integer
Public Sub New(passedThreshold As Integer)
threshold = passedThreshold
End Sub
Public Sub Add(x As Integer)
total = total + x
If (total >= threshold) Then
OnThresholdReached(EventArgs.Empty)
End If
End Sub
Protected Overridable Sub OnThresholdReached(e As EventArgs)
RaiseEvent ThresholdReached(Me, e)
End Sub
Public Event ThresholdReached As EventHandler
End Class