Adding a copy of a row in a DataGridView

[michael sorens]

I tried to do a simple operation on a Windows Form in VS2005 inside a
key_down handler:

if (e.Control && e.Shift && e.KeyCode == Keys.V)
{
int selectedRowIndex = dataGridView.SelectedCells[0].RowIndex;
dataGridView.Rows.AddCopy(selectedRowIndex);
}

So when the user presses Ctrl-Shft-V, a copy of the first row of a user's
selection is added to the bottom of the DataGridView, just before the new
row.

In reality, I get a new row but it is blank. What am I missing?

 

[Linda Liu [MSFT]]

Hi Michael,

I performed a test based on your code snippet and did see the same thing as
you did. When I press Ctrl-Shift-V, a new row is added to the DataGridView
control and the new row is blank.

The DataGridViewRowCollection.AddCopy method adds a new row based on the
row at the specified index. But it doesn't means the new row will copy the
values of the row positioned at the specified index. Instead, it means the
InheritedStyle property of the new row has the same values as the
InheiritedStyle of the row positioned at the specified index. That's to
say, the new row has the same DataGridViewCellStyle as the specified row
does.

If you change the DefaultCellStyle property of a row and then add a new row
based on this row by calling the DataGridViewRowCollection.AddCopy method,
you will see the new row has the same DataGridViewCellStyle as this row.
The following is a sample code to change the DefaultCellStyle property of a
row.

this.dataGridView1.Rows[0].DefaultCellStyle.BackColor = Color.Azure;

You could add the above line of code in your application to have a test.

To copy the values of the specified row to the new row, you should do it
manually. The following is a sample.

void dataGridView1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Control && e.Shift && e.KeyCode == Keys.V)
{
int selectedRowIndex =
this.dataGridView1.SelectedCells[0].RowIndex;
int i = this.dataGridView1.Rows.AddCopy(selectedRowIndex);
// copy the values of the row positioned at
selectedRowIndex to the new row
this.dataGridView1.Rows.Cells[0].Value =
this.dataGridView1.Rows[selectedRowIndex].Cells[0].Value;
this.dataGridView1.Rows.Cells[1].Value =
this.dataGridView1.Rows[selectedRowIndex].Cells[1].Value;
.....
}
}


Hope this helps.
If you have anything unclear, please feel free to let me know.


Sincerely,
Linda Liu
Microsoft Online Community Support

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[michael sorens]

Re-reading the API for AddCopy, you are correct: it does not explicitly
say it copies the data though it sure implies that from the name! Thanks
for pointing out the distinction...