查找和计数唯一的字母在数组列表VBA

Question

我需要能够计算数组中唯一字母的数量，例如:

[A01, B01, C01, A02, C02]

对于这个例子，结果应该是3。因此，我只需要在找到新字母的情况下包含该值。

这是在Word 2007用户表单中完成的。关于完成这样的任务有什么建议或例子吗?

Answer 1

这对我有用。执行Test()宏获取demo数据的结果

Function UniqueLetterCount(ByRef Values() As String) As Integer
    UniqueLetterCount = 0
    Dim LettersSeen    As String
    Dim i As Integer
    Dim Letter As String
    LettersSeen = ""
    For i = LBound(Values) To UBound(Values)
        Letter = Left(Values(i), 1)
        If InStr(LettersSeen, Letter) = 0 Then 'if Letter was not found in LettersSeen
            UniqueLetterCount = UniqueLetterCount + 1
            LettersSeen = LettersSeen & Letter
        End If
    Next
End Function

Sub Test()
    Dim DemoArray(9) As String
    DemoArray(0) = "A01"
    DemoArray(1) = "A02"
    DemoArray(2) = "B01"
    DemoArray(3) = "C01"
    DemoArray(4) = "A03"
    DemoArray(5) = "D01"
    DemoArray(6) = "D02"
    DemoArray(7) = "C02"
    DemoArray(8) = "B02"
    DemoArray(9) = "C03"
    MsgBox "Unique letter count is " & UniqueLetterCount(DemoArray)
End Sub