如何使用iText 7通过在C＃中转换两个输入HTML文件/字符串来创建具有两个不同页面方向的单个PDF文档

Question

两个不同的方向，即LETTER_LANDSCAPE，LETTER_PORTRAIT 下面提到的两个HTML字符串-

string html1 = 
"<h1>Test</h1><p>The billing period January 1 – January 31, 2018 This bill 
contains the charges for your purchases and services consumed this month XYZ. 
You will be able to find more details about your bill at this URL </p>"; 

string html2 = 
"<h1>Test</h1><p>The billing period June 1 – June 30, 2018 This 
bill contains the charges for your purchases and services consumed this month 
XYZ.</p>";

注意：我们尝试通过在具有不同方向的本地驱动器中创建两个不同的物理PDF文件，并使用PdfMerger的Merge功能合并这两个文件。 我们面临以下问题： Insert text and then merge pdf