iTextSharp PDF 旋转页面移动

Question

我尝试使用 iTextSharp 创建多页 pdf 文档。我有一个包含自身方向（横向或纵向）的对象。当第一个对象包含需要横向模式的信息时，我使用 Document doc = new Document(PageSize.A4.Rotate(), 10f, 10f, 10f, 0f) 创建文档。在下一个元素处于纵向模式之前，这非常有效！如果元素处于纵向模式，我会再次设置页面大小：doc.SetPageSize(PageSize.A4);。

此时该元素应该位于 PDF 文档的纵向 A4 页面上，但它仍处于横向模式。它不会切换页面，直到到达新对象或在当前元素内到达分页符！

这是我的代码：

TableObject to_first = myTables.First();
//current object need landscape orientation
if (to_first._orientation == "landscape")
{
    //Create an iTextSharp Document which is an abstraction of a PDF but **NOT** a PDF
    using (Document doc = new Document(PageSize.A4.Rotate(), 10f, 10f, 10f, 0f))
    {
        //Create a writer that's bound to our PDF abstraction and our stream
        using (PdfWriter writer = PdfWriter.GetInstance(doc, ms))
        {
            //Open the document for writing
            doc.Open();

            //writer.CloseStream = false;
            //loop all tableobjects inside the document & the instance of PDFWriter itself! 
            foreach (TableObject to in myTables.ToList())
            {
                doc.NewPage();
                //look for the requested orientation by the current object and apply it
                if (to._orientation == "landscape")
                {
                    doc.SetPageSize(PageSize.A4.Rotate());
                }
                else if (to._orientation == "portrait")
                {
                    doc.SetPageSize(PageSize.A4);
                }
                currentTable = to;
                //Get the data from database corresponding to the current tableobject and fill all the stuff we need!
                DataTable dt = getDTFromID(currentTable._tableID);
                Object[] genObjects = new Object[5];
                genObjects = gen.generateTable(dt, currentTable._tableName, currentTable._tableID.ToString(), currentTable, true);

                StringBuilder sb = (StringBuilder)genObjects[1];
                String tableName = sb.ToString();
                Table myGenTable = (Table)genObjects[0];
                String table = genObjects[2].ToString();

                using (StringReader srHtml = new StringReader(table))
                {
                    //Parse the HTML
                    iTextSharp.tool.xml.XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, srHtml);
                }
            }

            //After all of the PDF "stuff" above is done and closed but **before** we
            //close the MemoryStream, grab all of the active bytes from the stream
            doc.Close();
            bytes = ms.ToArray();
        }
    }
}

如何确保每个页面都正确旋转？

Answer 1

doc.SetPageSize 仅设置用于创建新页面的大小，不适用于现有页面。因此，你应该移动你的

doc.NewPage();

在 SetPageSize 调用 之后 调用：

//look for the requested orientation by the current object and apply it
if (to._orientation == "landscape")
{
    doc.SetPageSize(PageSize.A4.Rotate());
}
else if (to._orientation == "portrait")
{
    doc.SetPageSize(PageSize.A4);
}

// After setting the page size, trigger the generation of the new page
doc.NewPage();