Aspose.Words for .NET. How to merge table cells in C#.

check-cells-merged.cs

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
Document doc = new Document(MyDir + "Table with merged cells.docx");

Table table = (Table) doc.GetChild(NodeType.Table, 0, true);

foreach (Row row in table.Rows)
{
    foreach (Cell cell in row.Cells)
    {
        Console.WriteLine(PrintCellMergeType(cell));
    }
}

convert-to-horizontally-merged-cells.cs

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
Document doc = new Document(MyDir + "Table with merged cells.docx");

Table table = doc.FirstSection.Body.Tables[0];
// Now merged cells have appropriate merge flags.
table.ConvertToHorizontallyMergedCells();

horizontal-and-vertical-merge-helper-classes.cs

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
/// <summary>
/// Helper class that contains collection of rowinfo for each row.
/// </summary>
public class TableInfo
{
    public List<RowInfo> Rows { get; } = new List<RowInfo>();
}

/// <summary>
/// Helper class that contains collection of cellinfo for each cell.
/// </summary>
public class RowInfo
{
    public List<CellInfo> Cells { get; } = new List<CellInfo>();
}

/// <summary>
/// Helper class that contains info about cell. currently here is only colspan and rowspan.
/// </summary>
public class CellInfo
{
    public CellInfo(int colSpan, int rowSpan)
    {
        ColSpan = colSpan;
        RowSpan = rowSpan;
    }

    public int ColSpan { get; }
    public int RowSpan { get; }
}

public class SpanVisitor : DocumentVisitor
{
    /// <summary>
    /// Creates new SpanVisitor instance.
    /// </summary>
    /// <param name="doc">
    /// Is document which we should parse.
    /// </param>
    public SpanVisitor(Document doc)
    {
        mWordTables = doc.GetChildNodes(NodeType.Table, true);

        // We will parse HTML to determine the rowspan and colspan of each cell.
        MemoryStream htmlStream = new MemoryStream();

        Aspose.Words.Saving.HtmlSaveOptions options = new Aspose.Words.Saving.HtmlSaveOptions
        {
            ImagesFolder = Path.GetTempPath()
        };

        doc.Save(htmlStream, options);

        // Load HTML into the XML document.
        XmlDocument xmlDoc = new XmlDocument();
        htmlStream.Position = 0;
        xmlDoc.Load(htmlStream);

        // Get collection of tables in the HTML document.
        XmlNodeList tables = xmlDoc.DocumentElement.GetElementsByTagName("table");

        foreach (XmlNode table in tables)
        {
            TableInfo tableInf = new TableInfo();
            // Get collection of rows in the table.
            XmlNodeList rows = table.SelectNodes("tr");

            foreach (XmlNode row in rows)
            {
                RowInfo rowInf = new RowInfo();
                // Get collection of cells.
                XmlNodeList cells = row.SelectNodes("td");

                foreach (XmlNode cell in cells)
                {
                    // Determine row span and colspan of the current cell.
                    XmlAttribute colSpanAttr = cell.Attributes["colspan"];
                    XmlAttribute rowSpanAttr = cell.Attributes["rowspan"];

                    int colSpan = colSpanAttr == null ? 0 : int.Parse(colSpanAttr.Value);
                    int rowSpan = rowSpanAttr == null ? 0 : int.Parse(rowSpanAttr.Value);

                    CellInfo cellInf = new CellInfo(colSpan, rowSpan);
                    rowInf.Cells.Add(cellInf);
                }

                tableInf.Rows.Add(rowInf);
            }

            mTables.Add(tableInf);
        }
    }

    public override VisitorAction VisitCellStart(Cell cell)
    {
        int tabIdx = mWordTables.IndexOf(cell.ParentRow.ParentTable);
        int rowIdx = cell.ParentRow.ParentTable.IndexOf(cell.ParentRow);
        int cellIdx = cell.ParentRow.IndexOf(cell);

        int colSpan = 0;
        int rowSpan = 0;
        if (tabIdx < mTables.Count &&
            rowIdx < mTables[tabIdx].Rows.Count &&
            cellIdx < mTables[tabIdx].Rows[rowIdx].Cells.Count)
        {
            colSpan = mTables[tabIdx].Rows[rowIdx].Cells[cellIdx].ColSpan;
            rowSpan = mTables[tabIdx].Rows[rowIdx].Cells[cellIdx].RowSpan;
        }

        Console.WriteLine("{0}.{1}.{2} colspan={3}\t rowspan={4}", tabIdx, rowIdx, cellIdx, colSpan, rowSpan);

        return VisitorAction.Continue;
    }

    private readonly List<TableInfo> mTables = new List<TableInfo>();
    private readonly NodeCollection mWordTables;
}

horizontal-merge.cs

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

builder.InsertCell();
builder.CellFormat.HorizontalMerge = CellMerge.First;
builder.Write("Text in merged cells.");

builder.InsertCell();
// This cell is merged to the previous and should be empty.
builder.CellFormat.HorizontalMerge = CellMerge.Previous;
builder.EndRow();

builder.InsertCell();
builder.CellFormat.HorizontalMerge = CellMerge.None;
builder.Write("Text in one cell.");

builder.InsertCell();
builder.Write("Text in another cell.");
builder.EndRow();
builder.EndTable();
            
doc.Save(ArtifactsDir + "WorkingWithTables.HorizontalMerge.docx");

merge-cell-range.cs

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
Document doc = new Document(MyDir + "Table with merged cells.docx");

Table table = doc.FirstSection.Body.Tables[0];

// We want to merge the range of cells found inbetween these two cells.
Cell cellStartRange = table.Rows[0].Cells[0];
Cell cellEndRange = table.Rows[1].Cells[1];

// Merge all the cells between the two specified cells into one.
MergeCells(cellStartRange, cellEndRange);
            
doc.Save(ArtifactsDir + "WorkingWithTables.MergeCellRange.docx");

merge-cells.cs

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
internal void MergeCells(Cell startCell, Cell endCell)
{
    Table parentTable = startCell.ParentRow.ParentTable;

    // Find the row and cell indices for the start and end cell.
    Point startCellPos = new Point(startCell.ParentRow.IndexOf(startCell),
        parentTable.IndexOf(startCell.ParentRow));
    Point endCellPos = new Point(endCell.ParentRow.IndexOf(endCell), parentTable.IndexOf(endCell.ParentRow));

    // Create a range of cells to be merged based on these indices.
    // Inverse each index if the end cell is before the start cell.
    Rectangle mergeRange = new Rectangle(Math.Min(startCellPos.X, endCellPos.X),
        Math.Min(startCellPos.Y, endCellPos.Y),
        Math.Abs(endCellPos.X - startCellPos.X) + 1, Math.Abs(endCellPos.Y - startCellPos.Y) + 1);

    foreach (Row row in parentTable.Rows)
    {
        foreach (Cell cell in row.Cells)
        {
            Point currentPos = new Point(row.IndexOf(cell), parentTable.IndexOf(row));

            // Check if the current cell is inside our merge range, then merge it.
            if (mergeRange.Contains(currentPos))
            {
                cell.CellFormat.HorizontalMerge = currentPos.X == mergeRange.X ? CellMerge.First : CellMerge.Previous;

                cell.CellFormat.VerticalMerge = currentPos.Y == mergeRange.Y ? CellMerge.First : CellMerge.Previous;
            }
        }
    }
}

print-horizontal-and-vertical-merged.cs

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
Document doc = new Document(MyDir + "Table with merged cells.docx");

SpanVisitor visitor = new SpanVisitor(doc);
doc.Accept(visitor);

vertical-merge.cs

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

builder.InsertCell();
builder.CellFormat.VerticalMerge = CellMerge.First;
builder.Write("Text in merged cells.");

builder.InsertCell();
builder.CellFormat.VerticalMerge = CellMerge.None;
builder.Write("Text in one cell");
builder.EndRow();

builder.InsertCell();
// This cell is vertically merged to the cell above and should be empty.
builder.CellFormat.VerticalMerge = CellMerge.Previous;

builder.InsertCell();
builder.CellFormat.VerticalMerge = CellMerge.None;
builder.Write("Text in another cell");
builder.EndRow();
builder.EndTable();
            
doc.Save(ArtifactsDir + "WorkingWithTables.VerticalMerge.docx");