CODEWITHSUNDEEP
c#winformsdatagridview
Akpegnon K. Jacob Mahone's
Akpegnon K. Jacob Mahone's

Reputation: 133

Hide specified cell borders in datagridview?

I want to hide one or two grid cells from my datagriview. But with this code all the grids are hidden and this is not what I want.

I want to hide one or two rectangles cells from my Datagridview.

I do not want to hide columns or data which Contain my cells .

I just wanna hide a Specified cells.

dataGridView1.CellBorderStyle = DataGridViewCellBorderStyle.None;

Upvotes: 4

Views: 9178

Answers (1)

TaW
TaW

Reputation: 54433

The recommended way to hide or modify cell border style is to code the CellPainting event.

Don't worry, no actual painting is required. All you need to do is set a few fields in the e.AdvancedBorderStyle parameter.

Here is an example:

enter image description here

Note the 'vertically merged' look of of the cells in the 3rd column; same for the 'horizontally merged' cells at the bottom. Also the double border of a cell in the 5th column.

private void dataGridView1_CellPainting(object sender,
                                        DataGridViewCellPaintingEventArgs e)
{
    if (e.ColumnIndex == 2 && e.RowIndex == 6)
        e.AdvancedBorderStyle.Right = DataGridViewAdvancedCellBorderStyle.None;

    if (e.ColumnIndex == 2 && e.RowIndex == 1)
        e.AdvancedBorderStyle.Bottom = DataGridViewAdvancedCellBorderStyle.None;

    if (e.ColumnIndex == 4 && e.RowIndex == 4)
    {
        e.AdvancedBorderStyle.All = DataGridViewAdvancedCellBorderStyle.InsetDouble;
        e.AdvancedBorderStyle.Bottom = DataGridViewAdvancedCellBorderStyle.Single;
    }
}

Note that hiding borders is rather straight forward : Simply hide the right or the bottom border; other borderstyles require some trial and error (or a deeper understanding ;-)

Here I first set the style for all sides but as it paints the botton white (at least that's what I think it does) I then set the botton border back to single.

You may want to streamline the way the checks are done; this is just a simple example.

Update:

Here is a code to make the merging more dynamic: Use the mergeCells function to mark a cell for merging or un-merging with its right or bottom neighbour:

private void mergeCells(DataGridViewCell cell, bool mergeH, bool mergeV)
{
    string m = "";
    if (mergeH) m += "R";  // merge horizontally by hiding the right border line
    if (mergeV) m += "B"; // merge vertically by hiding the bottom border line
    cell.Tag =  m == "" ? null : m;
}

The CellPainting now looks like this:

private void customDGV1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    if (e.ColumnIndex < 0 || e.RowIndex < 0) return;
    DataGridViewCell cell = ((DataGridView)sender)[e.ColumnIndex, e.RowIndex];
    if (cell.Tag == null) return;
    string hide = cell.Tag.ToString();

    if (hide.Contains("R")) 
        e.AdvancedBorderStyle.Right = DataGridViewAdvancedCellBorderStyle.None;
    else
        e.AdvancedBorderStyle.Right = DataGridViewAdvancedCellBorderStyle.Single;

    if (hide.Contains("B")) 
        e.AdvancedBorderStyle.Bottom = DataGridViewAdvancedCellBorderStyle.None;
    else 
        e.AdvancedBorderStyle.Bottom = DataGridViewAdvancedCellBorderStyle.Single;

}

Update 2:

If you want to apply this to the ColumnHeaders you need to turn off dgv.EnableHeadersViualStyles first..

Upvotes: 8

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