如何使用Xfinium.PDF在合法大小的分页器上创建文档？

PdfFixedDocument document = new PdfFixedDocument();

PdfPage page = document.Pages.Add();

page.Width = PdfPageSize.Legal.Width;
page.Height = PdfPageSize.Legal.Height;
page.Margins.Left = 50;
page.Margins.Right = 50;
page.Margins.Top = 50;
page.Margins.Bottom = 50;

PdfFormattedText text = new PdfFormattedText();
text.Text = "Hello, World!";
text.Font = new PdfStandardFont(PdfStandardFontFace.Helvetica, 12);
text.Position = new PdfPoint(50, 50);
page.Graphics.DrawString(text);

document.Save("output.pdf");