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vb.net get datagridview column into an array

Posted on 2013-05-26
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Last Modified: 2013-05-26
Hi Experts.  I have a datagridview where the first column is a list of numbers and need to get the column into an array (not an array list).

I'm trying

         Dim list() As Integer
         For RowIndex As Integer = 0 To DataGridView1.Rows.Count - 1 Step 1
            list(RowIndex) = DataGridView1(0, RowIndex).Value
        Next RowIndex

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But keep getting the error   Object reference not set to an instance of an object.

I've tried many different methods but keep getting the same error

Any help would be appreciated
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Question by:PNRT
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LVL 42

Expert Comment

by:sedgwick
ID: 39197599
add Imports System.Linq
and use this code:

Dim arr As Integer() = DataGridView1.Rows.Cast(Of DataGridRow)().Select(Function(n) Int.Parse(n(0).Value)).ToArray()

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Author Comment

by:PNRT
ID: 39197673
Thanks But got errors
First was
Type 'DataGridRow' is not defined
Changed to DataGridViewRow
Then got
Overload resolution failed because no accessible 'Select' can be called with these arguments:      

Is it not possible without Linq?
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LVL 42

Expert Comment

by:sedgwick
ID: 39197697
try replace line 3 with:
list(RowIndex) = DataGridView1.Rows(RowIndex)(0).Value

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LVL 2

Author Comment

by:PNRT
ID: 39197735
Thanks
But With
list(RowIndex) = DataGridView1.Rows(RowIndex)(0).Value
I get the error
Class 'System.Windows.Forms.DataGridViewRow' cannot be indexed because it has no default property

Sorry, no idea what its referring to
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LVL 42

Expert Comment

by:sedgwick
ID: 39197809
  Dim list As List(Of Integer) = New List(Of Integer)

        For Each d In DataGridView1.Rows.Cast(Of DataGridViewRow)()
            Dim num As Integer
            If Int32.TryParse(d.Cells(0).Value, num) Then
                list.Add(num)
            End If
        Next

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Author Comment

by:PNRT
ID: 39197823
Sorry, I mentioned in the first question above it had to be a simple array not a list as I need to send the array to a function that requires an array.

I didn't realize it would be so difficult just to get a column of numbers into an array.
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Accepted Solution

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sedgwick earned 500 total points
ID: 39197832
Its not at all, add this after u populate the list:
  Dim arr As Integer() = list.ToArray()
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