check if array is empty (vba excel)

问题

These if ... then statements are getting the wrong results in my opinion. The first is returning the value 'false' when it should be 'true'. The fourth returns the right value. The second and third return an error.

Sub empty_array()
  Dim arr1() As Variant

  If IsEmpty(arr1) Then
    MsgBox "hey"
  End If

  If IsError(UBound(arr1)) Then
    MsgBox "hey"
  End If

  If IsError(Application.match("*", (arr1), 0)) Then
    MsgBox "hey"
  End If

  ReDim arr1(1)
  arr1(1) = "hey"

  If IsEmpty(arr1) Then
    MsgBox "hey"
  End If
End Sub

回答1:

Arr1 becomes an array of 'Variant' by the first statement of your code:

Dim arr1() As Variant

Array of size zero is not empty, as like an empty box exists in real world.

If you define a variable of 'Variant', that will be empty when it is created.

Following code will display "Empty".

Dim a as Variant

If IsEmpty(a) then
  MsgBox("Empty")
Else
  MsgBox("Not Empty")
End If

回答2:

I would do this as

if isnumeric(ubound(a)) = False then msgbox "a is empty!"

回答3:

Adding into this: it depends on what your array is defined as. Consider:

dim a() as integer
dim b() as string
dim c() as variant

'these doesn't work
if isempty(a) then msgbox "integer arrays can be empty"
if isempty(b) then msgbox "string arrays can be empty"

'this is because isempty can only be tested on classes which have an .empty property

'this do work
if isempty(c) then msgbox "variants can be empty"

So, what can we do? In VBA, we can see if we can trigger an error and somehow handle it, for example

dim a() as integer
dim bEmpty as boolean

bempty=false

on error resume next
bempty=not isnumeric(ubound(a))
on error goto 0

But this is really clumsy... A nicer solution is to declare a boolean variable (a public or module level is best). When the array is first initialised, then set this variable. Because it's a variable declared at the same time, if it loses it's value, then you know that you need to reinitialise your array. However, if it is initialised, then all you're doing is checking the value of a boolean, which is low cost. It depends on whether being low cost matters, and if you're going to be needing to check it often.

option explicit

'declared at module level
dim a() as integer
dim aInitialised as boolean

sub DoSomethingWithA()
if not aInitialised then InitialiseA
'you can now proceed confident that a() is intialised
end sub

sub InitialiseA()
'insert code to do whatever is required to initialise A
'e.g. 
redim a(10)
a(1)=123
'...
aInitialised=true
end sub

The last thing you can do is create a function; which in this case will need to be dependent on the clumsy on error method.

function isInitialised(byref a() as variant) as boolean
isInitialised=false
on error resume next
isinitialised=isnumeric(ubound(a))
end function

回答4:

@jeminar has the best solution above.

I cleaned it up a bit though.

I recommend adding this to a FunctionsArray module

isInitialised=false is not needed because Booleans are false when created
On Error GoTo 0 wrap and indent code inside error blocks similar to with blocks for visibility. these methods should be avoided as much as possible but ... VBA ...

Function isInitialised(ByRef a() As Variant) As Boolean
    On Error Resume Next
    isInitialised = IsNumeric(UBound(a))
    On Error GoTo 0
End Function

回答5:

Above methods didn´t work for me. This did:

  Dim arrayIsNothing As Boolean

    On Error Resume Next
    arrayIsNothing = IsNumeric(UBound(YOUR_ARRAY)) And False
    If Err.Number <> 0 Then arrayIsNothing = True
    On Error GoTo 0

    'Now you can test:
    if arrayIsNothing then ...

回答6:

cyberponk's method worked for me (upvoted, I swear!). The others had various problems. However, you do need to remember to add an Err.Clear after checking Err.Number to be able to reuse this method because the error number is persistent, which will cause false positives when checking that the arrayIsNothing.

来源：https://stackoverflow.com/questions/26290781/check-if-array-is-empty-vba-excel

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