面试题：Visual Basic自定义运算符重载

Question

请你编写一个Visual Basic类，在其中重载加法运算符“+”，使得该类的两个实例对象相加能按照特定的业务逻辑返回结果，比如将两个对象中的某个数值属性相加后返回一个新的对象。

Answer 1

Public Class MyClass
    Private num As Integer

    Public Sub New(ByVal value As Integer)
        num = value
    End Sub

    Public Shared Operator +(ByVal a As MyClass, ByVal b As MyClass) As MyClass
        Dim resultValue As Integer = a.num + b.num
        Return New MyClass(resultValue)
    End Operator

    Public Overrides Function ToString() As String
        Return num.ToString()
    End Function
End Class

你可以使用以下方式测试这个类：

Module Module1
    Sub Main()
        Dim obj1 As New MyClass(5)
        Dim obj2 As New MyClass(3)
        Dim result As MyClass = obj1 + obj2
        Console.WriteLine(result.ToString()) '输出8
    End Sub
End Module