WPF Datagrid: copy additional rows to clipboard

Question

I am working with the WPF Datagrid and I am trying to enhance/change the copy & paste mechanism.

When the user selects some cells and then hit CTRL + C, the underlying controls is able to catch the CopyingRowClipboardContent event.

 this.mainDataGrid.CopyingRowClipboardContent 
              += this.DatagridOnCopyingRowClipboardContent;

In this method, some cells are added to both the header and the rows, hence resulting in a "wider" grid.

    private void DatagridOnCopyingRowClipboardContent(
        object sender, 
        DataGridRowClipboardEventArgs dataGridRowClipboardEventArgs)
    {
        // this is fired every time a row is copied
        var allContent = dataGridRowClipboardEventArgs.ClipboardRowContent;

        allContent.Insert(0, new DataGridClipboardCellContent(
                                            null, 
                                            this.mainDataGrid.Columns[0], 
                                            "new cell"));
    }

At this point I am stuck because I am trying to add an additional row before the header and two after the last row (see image below).

Any ideas? Suggestions?

Please note I am not interested in an MVVM way of doing it here.

Answer 1

Here is a code snippet that might help you. This snippet is mainly used to retrieve all of your selected data, including headers (I removed the RowHeaders part since you apparently don't need it). If you have any question please let me know. I left a few part with comments written in capital letters: this is where you should add your own data The good part of this approach is that it directly works with your DataGrid's ItemsSource and NOT the DataGridCell. The main reason being: if you use DataGridCell on a formatted number for example, you will NOT get the actual value, but just the formatted one (say your source is 14.49 and your StringFormat is N0, you'll just copy 14 if you use a "regular" way)

   /// <summary>
    /// Handles DataGrid copying with headers
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void OnCopyingDataGrid(object sender, ExecutedRoutedEventArgs e)
    {
        // First step: getting the coordinates list of all cells selected
        IList<Tuple<int, int>> cellsCoordinatesList = new List<Tuple<int, int>>();
        HashSet<int> rowList = new HashSet<int>();
        HashSet<int> columnList = new HashSet<int>();
        foreach (System.Windows.Controls.DataGridCellInfo cell in this.SelectedCells)
        {
            int column = cell.Column.DisplayIndex;
            int row = this.Items.IndexOf(cell.Item);
            cellsCoordinatesList.Add(new Tuple<int, int>(row, column));
            if (!rowList.Contains(row))
            {
                rowList.Add(row);
            }
            if (!columnList.Contains(column))
            {
                columnList.Add(column);
            }
        }

        // Second step: Create the table to copy/paste
        object[,] arrayToBeCopied = new object[rowList.Count, columnList.Count + 1];
        IList<string> colHead = this.ColumnHeaders.Cast<object>().Select(h => h.ToString()).ToList();
        for (int row = 0; row < arrayToBeCopied.GetLength(0); row++)
        {
            for (int column = 0; column < arrayToBeCopied.GetLength(1); column++)
            {
                if (row == 0)
                {
                    arrayToBeCopied[row, column] = colHead[columnList.ElementAt(column - 1)];
                }
                else
                {
                    arrayToBeCopied[row, column] = // WHATEVER YOU WANT TO PUT IN THE CLIPBOARD SHOULD BE HERE. THIS SHOULD GET SOME PROPERTY IN YOUR ITEMSSOURCE

                }
            }
        }

        // Third step: Converting it into a string
        StringBuilder sb = new StringBuilder();

        // HERE, ADD YOUR FIRST ROW BEFORE STARTING TO PARSE THE COPIED DATA

        for (int row = 0; row < arrayToBeCopied.GetLength(0); row++)
        {
            for (int column = 0; column < arrayToBeCopied.GetLength(1); column++)
            {
                sb.Append(arrayToBeCopied[row, column]);
                if (column < arrayToBeCopied.GetLength(1) - 1)
                {
                    sb.Append("\t");
                }
            }
            sb.Append("\r\n");
        }

        // AND HERE, ADD YOUR LAST ROWS BEFORE SETTING THE DATA TO CLIPBOARD

        DataObject data = new DataObject();
        data.SetData(DataFormats.Text, sb.ToString());

        Clipboard.SetDataObject(data);
    }