Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....presentationDocument == null ) { throw new ArgumentNullExceptio ( "presentationDocument"...List < string > titlesList = new List < string >(); // 按幻灯片顺序获取每个幻灯片的标题。...