Header not working as expected

[davideTES]

Describe the bug
I'm trying to generate a report with a different header on the first page. The headers on page 1 and page 2 are fine, but from page 3, the header is different from what I expected.

To Reproduce
This is the ComposeHeader method

private void ComposeHeader(IContainer container)
{
    container.Background(Colors.Grey.Lighten3).Border(1).Column(column =>
    {
        column.Item().Table(table =>
        {
            table.ColumnsDefinition(columns =>
            {
                column.Spacing(10);

                columns.RelativeColumn();
                columns.RelativeColumn();
            });

            table.Cell().Row(1).Column(1)
                .Component(new HeaderLabelTemplate("Shared", "Valore"));
            table.Cell().Row(1).Column(2)
                .Component(new HeaderLabelTemplate("Shared", "Valore"));
        });

        column.Item().ShowOnce().Table(table =>
        {
            table.ColumnsDefinition(columns =>
            {
                column.Spacing(10);

                columns.RelativeColumn();
                columns.RelativeColumn();
            });

            table.Cell().Row(1).Column(1)
                .Component(new HeaderLabelTemplate("Inizio Lotto", "Valore"));
            table.Cell().Row(1).Column(2)
                .Component(new HeaderLabelTemplate("Lotto", "Valore"));

            table.Cell().Row(2).Column(1)
                .Component(new HeaderLabelTemplate("Fine Lotto", "Valore"));
            table.Cell().Row(2).Column(2)
                .Component(new HeaderLabelTemplate("Tipologia", "Valore"));
        });
    });
}

Expected behavior
I expect to find both tables on the first page and only the first one from page 2 onwards.

Screenshots
Header of page 1

Header of page 2

Headers of subsequent pages

Environment
I'm using version 2024.3.2 of the library and Windows 11 (x64).

[davideTES]

Moving the .ShowOnce() after Cell(), everything works as expected.

private void ComposeHeader(IContainer container)
{
    container.Background(Colors.Grey.Lighten3).Border(1).Column(column =>
    {
        column.Item().Table(table =>
        {
            table.ColumnsDefinition(columns =>
            {
                column.Spacing(10);

                columns.RelativeColumn();
                columns.RelativeColumn();
            });

            table.Cell().Row(1).Column(1)
                .Component(new HeaderLabelTemplate("Shared", "Valore"));
            table.Cell().Row(1).Column(2)
                .Component(new HeaderLabelTemplate("Shared", "Valore"));
        });

        column.Item().Table(table =>
        {
            table.ColumnsDefinition(columns =>
            {
                column.Spacing(10);

                columns.RelativeColumn();
                columns.RelativeColumn();
            });

            table.Cell().Row(1).Column(1).ShowOnce()
                .Component(new HeaderLabelTemplate("Inizio Lotto", "Valore"));
            table.Cell().Row(1).Column(2).ShowOnce()
                .Component(new HeaderLabelTemplate("Lotto", "Valore"));

            table.Cell().Row(2).Column(1).ShowOnce()
                .Component(new HeaderLabelTemplate("Fine Lotto", "Valore"));
            table.Cell().Row(2).Column(2).ShowOnce()
                .Component(new HeaderLabelTemplate("Tipologia", "Valore"));
        });
    });
}

Is this behavior intentional?

[MarcinZiabek]

Thank you for finding and reporting this issue 😄

Indeed, this behavior is not correct. I investigated the problem, and I already understand the root cause. I am working on a fix.

Do you know that you can simplify your code by replacing tables with a simpler element called Row?

.Row(row =>
{
    row.RelativeItem().Component(new HeaderLabelTemplate("Shared", "Valore"));
    row.RelativeItem().Component(new HeaderLabelTemplate("Shared", "Valore"));
});

[davideTES]

Thank you so much for the work you do with this library and for the advice on simplifying the code.