VB.NET(Of T)比较运算符

Question

在示例代码中,带有"错误注释"的行给出以下错误 -

• 对于类型"T"和"T",未定义运算符"<".

为什么VB不会自动调用相应的T运算符？(即如果T是整数,则调用整数比较函数.)

是否有可能以优雅的方式使这项工作？

这适用于.NET 2.0.

编辑 - 更新感兴趣的人的代码.

Public Class TreeNode(Of T)
    Public Left As TreeNode(Of T)
    Public Right As TreeNode(Of T)
    Public Value As IComparable(Of T)
    Public Sub New(ByVal _value As T)
        Value = _value
    End Sub
End Class

Public Class Tree(Of T)

    Private _Root As TreeNode(Of T)

    Public ReadOnly Property Root()
        Get
            Return _Root
        End Get
    End Property

    Public Sub New()
        _Root = Nothing
    End Sub

    Public Function Add(ByVal value As IComparable(Of T)) As TreeNode(Of T)
        If _Root Is Nothing Then
            _Root = New TreeNode(Of T)(value)
        Else
            Dim node As TreeNode(Of T) = _Root
            While node IsNot Nothing
                If value.CompareTo(node.Value) < 0 Then
                    If node.Left IsNot Nothing Then
                        node = node.Left
                    Else
                        node.Left = New TreeNode(Of T)(value)
                        Return node.Left
                    End If
                Else
                    If node.Right IsNot Nothing Then
                        node = node.Right
                    Else
                        node.Right = New TreeNode(Of T)(value)
                        Return node.Right
                    End If
                End If
            End While
        End If
        Return _Root
    End Function

    Public Sub Print(ByVal node As TreeNode(Of T))
        If node IsNot Nothing Then
            Print(node.Left)
            Console.WriteLine(node.Value)
            Print(node.Right)
        End If
    End Sub

End Class

Answer 1

为什么VB不会自动调用相应的T运算符？(即如果T是整数,则调用整数比较函数.)

因为对T没有约束可以确保它具有适当的运算符.您可以要求T为IComparable,并使用它的CompareTo方法.