Visual Basic 中的可移植模式函数

Question

我正在尝试让我的Mode 函数接受任何类型的数组，但我没有取得任何进展。这是我现在得到的：

Private Function Mode(ByRef list As Object) As Object
        Dim array() As Object = {}
        Try
            array = CType(list, Object())
        Catch ex As Exception
            MessageBox.Show("Failed to cast array of Objects in Mode function!")
            Return Nothing
        End Try
        Dim uniqueObjects() As Integer = {array(0)}
        Dim frequency() As Integer = {1}
        For i As Integer = 0 To array.Length - 1
            For j As Integer = 0 To uniqueObjects.Length - 1 'loop through frequency
                If array(i) = uniqueObjects(j) Then
                    frequency(j) += 1
                    Exit For
                ElseIf j = uniqueObjects.Length - 1 Then
                    ReDim Preserve uniqueObjects(uniqueObjects.Length) 'add to unique objects array
                    uniqueObjects(uniqueObjects.Length - 1) = array(i)
                    ReDim Preserve frequency(frequency.Length) 'increment frequency
                    frequency(frequency.Length - 1) += 1
                End If
            Next
        Next

        Return uniqueObjects(System.Array.IndexOf(frequency, frequency.Max))
    End Function

我通常会摆脱对CType 的缓慢调用，只将对象数组传递给函数，但是当我将整数数组传递给函数时，它给了我一个奇怪的错误：

错误 1 ​​类型“整数的一维数组”的值无法转换为“对象的一维数组”，因为“整数”不是引用类型。 {filename}.vb {line} {column} {项目名称}

事实证明这比我预期的要复杂得多。有人可以提供建议吗？

Answer 1

把它变成一个通用函数怎么样？

Private Function Mode(Of T)(ByRef array As T()) As Object
    '...
End Function

或者

Private Function Mode(Of T)(ByRef array As T()) As T()
    '...
End Function

然后你做：

Dim obj As Object = Mode(Of Integer)({0, 1, 2, 3})

或者：

Dim obj As Integer() = Mode(Of Integer)({0, 1, 2, 3})