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Dumb question about array allocation

Posted on 2006-10-19
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Last Modified: 2010-04-23

Dumb question.  So the following code (lifted from msdn):

Dim binWriter As New BinaryWriter(New MemoryStream())
Dim binReader As New BinaryReader(binWriter.BaseStream)
Dim verifyArray() As Byte = binReader.ReadBytes(dataArray.Length)

will allocate the verifyArray to the correct size for me?  And as long as verifyArray is in scope, the data will still be there?

And if I called verifyArray = binReader.ReadBytes again, it would replace the old array with the new data, and the old array would eventually be garbage collected?

If so, it seems like a strange departure (from the pre-.NET world) for a called function to allocate the array for you, right?  What's the rhyme/reason for that?
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Question by:riceman0
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Mike Tomlinson earned 500 total points
ID: 17771631
That's correct.

I don't see this as any different from VB6.

Take the Split() function for example:

    Dim data As String
    Dim myArray() As String
   
    data = "1,2,3,4"
    myArray = Split(data, ",")
    Debug.Print LBound(myArray) & " --> " & UBound(myArray)

It automatically allocated the array to the right size for us...
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by:riceman0
ID: 17771756

Hmm, that's true.  Thanks.
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