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....计算一系列单元格的总和 Contents [ Hide ] OpenXML Excel 下面是我们需要在代码中使用的命名空间: using DocumentFormat...== 0 ) { // The specified worksheet does not exist. return ; }...