将集合作为参数发送到过程

Question

我尝试将集合作为函数输出提交给另一个过程。这是我的代码：

Function colGen() As Collection
Dim col As Collection
Dim bo As Boolean
Dim str As String
Set col = New Collection
bo = True
str = "Test"
col.Add bo
col.Add str
End Function

Sub test()
Dim col As Collection
Set col = New Collection
Dim str As String
col = colGen
MsgBox (str)
End Sub

但是在 col = colGen 行中我得到了 "Argument is not optional" 的错误，但就是不明白为什么会这样。有人可以帮我吗？

Answer 1

你有几个问题。首先，您的函数实际上 return 什么都没有。其次，在将对象分配给变量时需要使用 Set：

Function colGen() As Collection
    Dim col                   As Collection
    Dim bo                    As Boolean
    Dim str                   As String
    Set col = New Collection
    bo = True
    str = "Test"
    col.Add bo
    col.Add str
    Set colGen = col
End Function

Sub test()
    Dim col                   As Collection
    Dim str                   As String
    Set col = colGen
    ' str has no value
    ' so check the collection
    MsgBox col(2)
End Sub

Answer 2

因为一个集合是一个对象，要影响它一个新值，你必须使用Set关键字，所以你的行应该是

Set col = colGen

而不是

col = colGen

就像你一样Set col = New Collection

您还忘记定义函数的输出，所以这是您修改后的代码：

Function colGen() As Collection
    Dim col As Collection, _
        bo As Boolean, _
        str As String

    Set col = New Collection

    bo = True
    str = "Test"

    col.Add bo
    col.Add str

    'You must assign your output value
    'As it is an object, you MUST use "Set"
    Set colGen = col
End Function

Sub test()
    Dim col As Collection, _
        str As String

    Set col = New Collection

    col = colGen
    str = col(col.Count)
    MsgBox (str)
End Sub

将集合作为参数发送到过程

Send collection to procedure as parameter

excel

vba

arguments

object