Datagrid column problem

Question

My datagrid has a big problem it happens only in columns that are read only. Please see the image at: > The gost that I show it’s like a new readonly textbox. If the selected cell it’s not readonly there’s no problem. I think that the problem it’s ralated with lose of focus of the datagrid. After pressing a button I fill again the datagrid with new datasource but this thing remains hiding the new value! Only with scrool I can see that the new value it’s really there but the old is hiding it. I tried datagrid Refresh() and so many things but nothing works. Need help please. Thanks Paulo Gonçalves pfrg@mega.ist.utl.pt

hoanhnd · Answer

That's great My proplem fixed. After assign datasource  set cs.ReadOnly = True; Thanks you !

pfrg · Answer

Yeah! Yes it works Scott thanks good idea. I solved this with the simulated click in datagrid row header but I'm going to change for your solution. Paulo

dxmer · Answer

I had the same problem and fixed it by changing the cell's tablestyle readonly property to false right before I refresh it with new data. Seems to end the weird edit mode it gets stuck in when using readonly columns. DataGridTableStyle ts = dataGrid.TableStyles[0]; DataGridTextBoxColumn cs = (DataGridTextBoxColumn)ts.GridColumnStyles[dataGrid.CurrentCell.ColumnNumber]; cs.ReadOnly = false; Scott

pfrg · Answer

I have done that already but it's the same clear the dataSource or put it to null has the same efect. Thanks for your help.

Andrzej Wegierski · Answer

May be try to clear dataset/datatable used in DataSource instead of setting null.

pfrg · Answer

I tryed the refresh() but it did not works the others propositions I didn't try. I resolved the problem with a simulated mouseclick on datagrid rowheader I saw an example in this URL: http://www.syncfusion.com/FAQ/WinForms/FAQ_c44c.asp#q875q With this click there is no cell selected and it solves the problem. But this is a bug of the framework .NET? Or i'm doing something wrong? I just put the datasorce=null... ----------------------------------------- This code adds a method to a derived grid that simulates a mouseclick on the rowheader of the row passed into the method. 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); }

Andrzej Wegierski · Answer

Very strange bug. I use datgrid since three years but I didn't seen it up to now. Try to repair it. Some propostions: - simple Refresh(); - repaint background - override object and add repainting background to clearing data source (not tested)

pfrg · Answer

The server had some problems but now it's ok. Try to see the picture again please it's the best way to see the problem. The problem is that if clear the dataSource of the datagrid when a cell of a readonly column is selected this cell (with the gray background) reamains painted when the rest had correctly disapear. It's a bug of datagrid?? Thanks

Andrzej Wegierski · Answer

Your server is now unreadable. Would You mind to write something about Your trouble?