RE: ArrayCopy length question
From: Dennis (Dennis_at_discussions.microsoft.com)
Date: 08/29/04
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Date: Sun, 29 Aug 2004 12:15:04 -0700
Not sure if this helps or if I'm reading it right but my documentation for
Array.Copyto method says that it's only for "one" dimensional arrays.
"mark" wrote:
> I have been modifying an application to enable debugging with Strict ON. I
> need to use the Array.Copy method and I have encountered an anomaly that I do
> not understand. I have reproduced the problem in the following simplified
> console application.
>
> Basically my problem is this: I dimension an array (ArrA) with a given
> number of rows and columns. When I use array.copy to copy the array to a new
> array (ArrB) with the length set to rows X columns, the ArrB is incomplete.
> It appears I must set the length to rows X (columns+1).
>
> Why?
>
>
> Sub Main()
>
> 'initalize an array ArrA
> Dim rows As Int32 = 3
> Dim cols As Int32 = 4
> Dim ArrA(rows, cols) As Double
> ArrA(0, 0) = 1 : ArrA(0, 1) = 2 : ArrA(0, 2) = 3 : ArrA(0, 3) = 4
> ArrA(1, 0) = 5 : ArrA(1, 1) = 6 : ArrA(1, 2) = 7 : ArrA(1, 3) = 8
> ArrA(2, 0) = 9 : ArrA(2, 1) = 10 : ArrA(2, 2) = 11 : ArrA(2, 3) = 12
>
> 'call a subroutine which copies the array and writes the copy
> CopyWrite(ArrA, rows, cols)
>
> Console.ReadLine()
>
> End Sub
>
> ' The CopyWrite subroutine
> Sub CopyWrite(ByVal array As Array, ByVal rows As Int32, ByVal cols As
> Int32)
>
> 'initialize the ArrB array
> Dim ArrB(rows, cols) As Double
>
> 'copy
> array.Copy(array, ArrB, rows * (cols + 1)) 'HERE IS THE LINE IN
> QUESTION
>
> 'write
> Dim i As Integer
> Dim j As Integer
> For i = 0 To 2
> For j = 0 To 3
> Console.Write(ArrB(i, j) & Chr(9))
> Next
> Console.WriteLine()
> Next
>
> End Sub
>
> with length set to rows X (cols + 1) I get the correct array:
>
> 1 2 3 4
> 5 6 7 8
> 9 10 11 12
>
>
> with length set to rows X cols I get this:
>
> 1 2 3 4
> 5 6 7 8
> 9 10 0 0
>
>
> --
> mark
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