iText 当单元格中的数据相同时如何合并单元格

Question

当单元格中的数据相同时如何合并单元格？我想合并具有相同值的后续单元格，例如 Header 1.

Answer 1

正如 mkl 在他的评论中解释的那样，iText 不会自动检测和合并具有相同内容的单元格。您必须在数据中进行这些检查并相应地设置必要的行跨度值。确切的实现将取决于您的 table 数据的数据结构，但从概念上讲它看起来像这样：

PdfWriter w = new PdfWriter("SO67333436.pdf");
PdfDocument pdfDoc = new PdfDocument(w);
Document doc = new Document(pdfDoc);

String[,] tabledata = new String[,] {
    { "Header 1", "Row 1" },
    { "Header 1", "Row 2" },
    { "Header 1", "Row 3" },
    { "Header 2", "Row 4" },
    { "Header 2", "Row 5" },
    { "Header 3", "Row 6" },
    { "Header 3", "Row 7" },
    { "Header 3", "Row 8" },
    { "Header 3", "Row 9" }
};

// Add the table without any preprocessing
doc.Add(new Paragraph("Table without any rowspans:"));
Table regulartable = new Table(2);
for (int r = 0; r < tabledata.GetLength(0); r++)
    {
    for (int c = 0; c < tabledata.GetLength(1); c++) {
        String celldata = tabledata[r,c];
        regulartable.AddCell(new Cell().Add(new Paragraph(celldata)));
    }
}
doc.Add(regulartable);

doc.Add(new Paragraph("Table with rowspans:"));
Table headertable = new Table(2);
int nextheader = 0;
for (int row = 0; row < tabledata.GetLength(0); row++)
{
    for (int column = 0; column < tabledata.GetLength(1); column++)
    {
        String celldata = tabledata[row, column];
        // first column
        if (column == 0)
        {
            // skip cells that have been merged
            if (row >= nextheader)
            {
                int rowspan = 1;
                // Check how many subsequent rows have the same cell content
                while (row + rowspan < tabledata.GetLength(0) && celldata.Equals(tabledata[row + rowspan,column]))
                {
                    rowspan++;
                }
                nextheader = row + rowspan;
                // Add the cell with the appropriate rowspan
                Cell cell = new Cell(rowspan, 1).Add(new Paragraph(celldata));
                headertable.AddCell(cell);
            }
        }
        // other columns
        else
        {
            Cell cell = new Cell().Add(new Paragraph(celldata));
            headertable.AddCell(cell);
        }
    }
}

doc.Add(headertable);
doc.Close();

结果输出：

iText 当单元格中的数据相同时如何合并单元格

iText How to merge cells when the data in the cells is the same

c#

itext