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DataGridView Column Width Grow Only Sizing

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20 Jun 2010CPOL 31.6K   9   2
A simple way to create a grow only Column Width routine
I was using a bound DataGridView to display a large number of records, with varying data widths in each column.

Initially, I was autosizing all the columns on data load, but with thousands of results, this was causing a lag when the data was loaded.

I then switched to autosizing only when the user scrolled the data, and on the displayed data, however this had the undersirable effect of making the columns all jump around (grow/shrink) as the user scrolled up and down the data.

I decided the best approach was a growing only column width, so as each column encountered longer data, the columns would be resized to fit the new data, but would not shrink again.

This worked great, improved the data load time, and resulted in a happy balance between visuals, usability and data load.

To achieve this, the DataGridView has Column AutoSizeColumMode set to DisplayedCells in the design environment, this caters for the first instance the data is bound to the DataGridView. Then, in the scroll event, turn this setting off as it is no longer required, and run the following snippet. DataResults is the name of my DataGridView

Private Sub DataResults_Scroll(ByVal sender As Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles DataResults.Scroll
    'Turn off Autosize, only used during the first data load.
    DataResults.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None

    'Get the preffered width for displayed data against each column and compare to current width
    'Set the new column width only if greater than current
    For Each column As DataGridViewColumn In DataResults.Columns
        If column.GetPreferredWidth(DataGridViewAutoSizeColumnMode.DisplayedCells, True) > column.Width Then
            column.Width = column.GetPreferredWidth(DataGridViewAutoSizeColumnMode.DisplayedCells, True)
        End If
End Sub


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By
Scotland Scotland
I have been working in the Oil & Gas Industry for over 30 years now.

Core Discipline is Instrumentation and Control Systems.

Completed Bsc Honours Degree (B29 in Computing) with the Open University in 2012.

Currently, Offshore Installation Manager in the Al Shaheen oil field, which is located off the coast of Qatar. Prior to this, 25 years of North Sea Oil & Gas experience.

Comments and Discussions

GeneralMy vote of 5 Pin
SBGTrading29-Jan-13 13:51
SBGTrading29-Jan-13 13:51 
GeneralRe: My vote of 5 Pin
DaveAuld29-Jan-13 19:59
professionalDaveAuld29-Jan-13 19:59 

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