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.... Text . Contains ( strToFind )) //将现有文本替换为新文本...//将现有文本替换为新文本 { string str = port . Text ; int idx = str . IndexOf (...