Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example: 1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 -> AB ... Example 1: Input: 1 Output: "A" Example 2: Input: 28 Output: "
1.添加引用NPOI.dll 2.cs文件头部添加 using NPOI.HSSF.UserModel; using NPOI.SS.UserModel; using System.IO; 3.代码如下: using System; using System.Collections.Generic; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Configuration;