Я специально смотрю на метод ShowInOrder, которому была передана функция делегата CompareNumbers.Я пытаюсь точно выяснить, что здесь происходит:
If compare(_num1, _num2) Then ...
Вот полный пример.Любая помощь будет оценена.
Module Module1
Sub Main()
' Create an instance of InOrderClass and assign values to the properties.
' InOrderClass method ShowInOrder displays the numbers in ascending
' or descending order, depending on the comparison method you specify.
Dim inOrder As New InOrderClass
inOrder.Num1 = 5
inOrder.Num2 = 4
' Use AddressOf to send a reference to the comparison function you want
' to use.
inOrder.ShowInOrder(AddressOf GreaterThan)
inOrder.ShowInOrder(AddressOf LessThan)
' Use lambda expressions to do the same thing.
inOrder.ShowInOrder(Function(m, n) m > n)
inOrder.ShowInOrder(Function(m, n) m < n)
End Sub
Function GreaterThan(ByVal num1 As Integer, ByVal num2 As Integer) As Boolean
Return num1 > num2
End Function
Function LessThan(ByVal num1 As Integer, ByVal num2 As Integer) As Boolean
Return num1 < num2
End Function
Class InOrderClass
' Define the delegate function for the comparisons.
Delegate Function CompareNumbers(ByVal num1 As Integer, ByVal num2 As Integer) As Boolean
' Display properties in ascending or descending order.
Sub ShowInOrder(ByVal compare As CompareNumbers)
If compare(_num1, _num2) Then
Console.WriteLine(_num1 & " " & _num2)
Else
Console.WriteLine(_num2 & " " & _num1)
End If
End Sub
Private _num1 As Integer
Property Num1() As Integer
Get
Return _num1
End Get
Set(ByVal value As Integer)
_num1 = value
End Set
End Property
Private _num2 As Integer
Property Num2() As Integer
Get
Return _num2
End Get
Set(ByVal value As Integer)
_num2 = value
End Set
End Property
End Class
Конечный модуль