iTextSharp PDF旋转页面被移动

本文关键字：移动 PDF 旋转 iTextSharp | 更新日期: 2023-09-27 18:29:26

我尝试使用iTextSharp创建一个多页pdf文档。我有一个包含自身方向的对象（横向或纵向）。当第一个对象包含需要横向模式的信息时，我用Document doc = new Document(PageSize.A4.Rotate(), 10f, 10f, 10f, 0f)创建文档。在下一个元素处于人像模式之前，这个效果非常好！如果一个元素处于纵向模式，我会再次设置页面大小：doc.SetPageSize(PageSize.A4);。

此时，元素应该位于PDF文档中的纵向A4页面上，但它仍处于横向模式。它只切换页面，直到到达新对象或当前元素中的分页！

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();
        }
    }
}

如何确保每一页都正确旋转？

iTextSharp PDF旋转页面被移动

doc.SetPageSize仅设置用于创建新页面的大小，而不设置用于现有页面的大小。因此，您应该移动

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();
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