Change Current Cell or Row programatically

[dionchen1]

Hi,

I have a datagrid bound to a dadaset table. I programatically added a new row. I wonder what is the easiest way to make the current cell or row to the newly added row in the datagrid?

Thanks.

Dion

[pareshgh]

datagrid's Select
property

[dionchen1]

Thanks for your help.

How do I find the newly added row number though?

Dion

[pareshgh]

just ,

int nRow = dataGridDetails.BindingContext[dataGridDetails.DataSource, dataGridDetails.DataMember].Count;



Paresh

[dionchen1]

Thanks again.

This only gives me the total row count, but not the newly added row index ( row number ), so that I can select though.

Also, datagrid.select( int) selects the row, but the arrow on the Row Header did not move to the selected row. Any ideas?

Dion

[pareshgh]

1) you could maintain the count. when you add/delete rows you maintain the count by doing n++ or n--

2) or you could do by

DataTable myTable = new DataTable("Persons");

...

DataColumn cPerson = new DataColumn("PersonID", typeof(int));

cPerson.AutoIncrement = true;

cPerson.AutoIncrementSeed = 1;

cPerson.AutoIncrementStep = 1;

myTable.Columns.Add(cPerson);




3) if you hit the mouseclick on a cell you can select the row by
private void dataGrid1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)

{

System.Drawing.Point pt = new Point(e.X, e.Y);

DataGrid.HitTestInfo hti = dataGrid1.HitTest(pt);

if(hti.Type == DataGrid.HitTestType.Cell)

{

dataGrid1.CurrentCell = new DataGridCell(hti.Row, hti.Column);

dataGrid1.Select(hti.Row);

}

}


the following is the method for when you click on a row header the row is selected.

public class MyDataGrid : DataGrid

{



public const int WM_LBUTTONDOWN = 513; // 0x0201

public const int WM_LBUTTONUP = 514; // 0x0202



[System.Runtime.InteropServices.DllImport("user32.dll")]

static extern bool SendMessage(IntPtr hWnd, Int32 msg, Int32 wParam, Int32 lParam);



public void ClickRowHeader(int row)

{

//get a point to click

Rectangle rect = this.GetCellBounds(row, 0);

Int32 lparam = MakeLong(rect.Left - 4, rect.Top + 4);



//clickit

SendMessage( this.Handle, WM_LBUTTONDOWN, 0, lparam);

SendMessage( this.Handle, WM_LBUTTONUP, 0, lparam);

}



static int MakeLong(int LoWord, int HiWord)

{

return (HiWord << 16) | (LoWord & 0xffff);

}



}

.....

.....

//usage - myDataGrid is of type MyDataGrid.

private void button2_Click(object sender, System.EventArgs e)

{

myDataGrid.ClickRowHeader(2);

}



Hope this all helps a bit
Paresh

[dionchen1]

Thanks very much.

[pareshgh]

i guess it worked !! let me know how it goes.

Paresh

[dionchen1]

Here is what I end up with:

//Select the newly added row
BindingManagerBase bmb = this.BindingContext[ dataGrid1.DataSource, dataGrid1.DataMember ];

for ( int i = 0; i < bmb.Count; i++ )
{
if (dataGrid1[i, 0].ToString() == newID.ToString() )
{
bmb.Position = i;
break;
}
}

Thanks for your help.

Dion

[pareshgh]

hmm.. good one. thanks for your tip..

bye