événement BeginPrint et problème DataGridView

Question

J'ai un datagridview sur la forme et c'est ont beaucoup de colonnes et de lignes. Maintenant, je veux dessiner la colonne DataGrid et lignes à PrintDocument puis imprimer. Mais lorsque l'événement BeginPrint de PrintDocument est en cours d'exécution, les colonnes et les lignes GRIDVIEW est vide, bien qu'il ne soit pas. Quelle est erreur?

private void printDocument_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
    {
        try
        {
            strFormat = new StringFormat();
            strFormat.Alignment = StringAlignment.Near;
            strFormat.LineAlignment = StringAlignment.Center;
            strFormat.Trimming = StringTrimming.EllipsisCharacter;

            arrColumnLefts.Clear();
            arrColumnWidths.Clear();
            iCellHeight = 0;
            iRow = 0;
            bFirstPage = true;
            bNewPage = true;

            // Calculating Total Widths
            iTotalWidth = 0;

            foreach (DataGridViewColumn dgvGridCol in dataGridView1.Columns)
            {
                iTotalWidth += dgvGridCol.Width;
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }

private void printDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    {
        try
        {
            //Set the left margin
            int iLeftMargin = e.MarginBounds.Left;

            //Set the top margin
            int iTopMargin = e.MarginBounds.Top;
            //Whether more pages have to print or not
            bool bMorePagesToPrint = false;
            int iTmpWidth = 0;

            //For the first page to print set the cell width and header height
            if (bFirstPage)
            {
                foreach (DataGridViewColumn GridCol in dataGridView1.Columns)
                {
                    iTmpWidth = (int)(Math.Floor((double)((double)GridCol.Width /
                                   (double)iTotalWidth * (double)iTotalWidth *
                                   ((double)e.MarginBounds.Width / (double)iTotalWidth))));

                    iHeaderHeight = (int)(e.Graphics.MeasureString(GridCol.HeaderText,
                                GridCol.InheritedStyle.Font, iTmpWidth).Height) + 11;

                    // Save width and height of headres
                    arrColumnLefts.Add(iLeftMargin);
                    arrColumnWidths.Add(iTmpWidth);
                    iLeftMargin += iTmpWidth;
                }
            }
            //Loop till all the grid rows not get printed
            while (iRow <= dataGridView1.Rows.Count - 1)
            {
                DataGridViewRow GridRow = dataGridView1.Rows[iRow];
                //Set the cell height
                iCellHeight = GridRow.Height + 5;
                int iCount = 0;
                //Check whether the current page settings allo more rows to print
                if (iTopMargin + iCellHeight >= e.MarginBounds.Height + e.MarginBounds.Top)
                {
                    bNewPage = true;
                    bFirstPage = false;
                    bMorePagesToPrint = true;
                    break;
                }
                else
                {
                    if (bNewPage)
                    {
                        //Draw Header
                        e.Graphics.DrawString("Customer Summary", new Font(dataGridView1.Font, FontStyle.Bold),
                                Brushes.Black, e.MarginBounds.Left, e.MarginBounds.Top -
                                e.Graphics.MeasureString("Customer Summary", new Font(dataGridView1.Font,
                                FontStyle.Bold), e.MarginBounds.Width).Height - 13);

                        String strDate = DateTime.Now.ToLongDateString() + " " + DateTime.Now.ToShortTimeString();
                        //Draw Date
                        e.Graphics.DrawString(strDate, new Font(dataGridView1.Font, FontStyle.Bold),
                                Brushes.Black, e.MarginBounds.Left + (e.MarginBounds.Width -
                                e.Graphics.MeasureString(strDate, new Font(dataGridView1.Font,
                                FontStyle.Bold), e.MarginBounds.Width).Width), e.MarginBounds.Top -
                                e.Graphics.MeasureString("Customer Summary", new Font(new Font(dataGridView1.Font,
                                FontStyle.Bold), FontStyle.Bold), e.MarginBounds.Width).Height - 13);

                        //Draw Columns                 
                        iTopMargin = e.MarginBounds.Top;
                        foreach (DataGridViewColumn GridCol in dataGridView1.Columns)
                        {
                            e.Graphics.FillRectangle(new SolidBrush(Color.LightGray),
                                new Rectangle((int)arrColumnLefts[iCount], iTopMargin,
                                (int)arrColumnWidths[iCount], iHeaderHeight));

                            e.Graphics.DrawRectangle(Pens.Black,
                                new Rectangle((int)arrColumnLefts[iCount], iTopMargin,
                                (int)arrColumnWidths[iCount], iHeaderHeight));

                            e.Graphics.DrawString(GridCol.HeaderText, GridCol.InheritedStyle.Font,
                                new SolidBrush(GridCol.InheritedStyle.ForeColor),
                                new RectangleF((int)arrColumnLefts[iCount], iTopMargin,
                                (int)arrColumnWidths[iCount], iHeaderHeight), strFormat);
                            iCount++;
                        }
                        bNewPage = false;
                        iTopMargin += iHeaderHeight;
                    }
                    iCount = 0;
                    //Draw Columns Contents                
                    foreach (DataGridViewCell Cel in GridRow.Cells)
                    {
                        if (Cel.Value != null)
                        {
                            e.Graphics.DrawString(Cel.Value.ToString(), Cel.InheritedStyle.Font,
                                        new SolidBrush(Cel.InheritedStyle.ForeColor),
                                        new RectangleF((int)arrColumnLefts[iCount], (float)iTopMargin,
                                        (int)arrColumnWidths[iCount], (float)iCellHeight), strFormat);
                        }
                        //Drawing Cells Borders 
                        e.Graphics.DrawRectangle(Pens.Black, new Rectangle((int)arrColumnLefts[iCount],
                                iTopMargin, (int)arrColumnWidths[iCount], iCellHeight));

                        iCount++;
                    }
                }
                iRow++;
                iTopMargin += iCellHeight;
            }

            //If more lines exist, print another page.
            if (bMorePagesToPrint)
                e.HasMorePages = true;
            else
                e.HasMorePages = false;
        }
        catch (Exception exc)
        {
            MessageBox.Show(exc.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }

Answer 1

Ajoutez cette ligne à votre gestionnaire d'événements BeginPrint:

this.Show();

Si vous voyez une nouvelle forme pop-up, avec une grille vide, vous utilisez la référence mauvais formulaire pour obtenir l'impression d'aller. Si cette nouvelle forme ne répond pas, alors vous avez aussi un problème de filetage.