删除Excel空列

 /// <summary>
        /// 删除Excel空列
        /// </summary>
        /// <param name="excelPath">Excel路径</param>
        /// <param name="columns">是空行但要保留的列</param>
        /// <returns></returns>
        public static void DeleteNullColumn(string excelPath)
        {
            //用的时候就拿到Main方法里去
            //DirectoryInfo dirInfo = new DirectoryInfo(@"C:Users11572Desktop木板年画元数据（依模板 供数据加工使用）");

            //foreach (var item in dirInfo.GetFiles())
            //{
            //    DeleteNullColumn(item.FullName);
            //}

            //必须要的列
            string[] colums = new string[]{
                "aaa","bbb","ccc"
            };
            DataTable dataTable = ExcelUtility.ExcelToDataTable(excelPath, 0, true);

            List<string> removeColumn = new List<string>();
            foreach (DataColumn column in dataTable.Columns)
            {
                int columLenght = 0;
                foreach (DataRow row in dataTable.Rows)
                {
                    columLenght += row[column.ColumnName].ToString().Length;
                    if (columLenght > 0)
                    {
                        break;
                    }
                }
                if (columLenght == 0)
                {
                    removeColumn.Add(column.ColumnName);
                }
            }
            foreach (var col in colums)
            {
                removeColumn.Remove(col);
            }
            foreach (var col in removeColumn)
            {
                dataTable.Columns.Remove(col);
            }

            dataTable.Columns["xx"].ColumnName = "xx";
            dataTable.Columns["xx"].ColumnName = "xx";

            if (ExcelUtility.DataTableToExcel(dataTable, Path.Combine(Path.GetDirectoryName(excelPath), "新建文件夹", Path.GetFileNameWithoutExtension(excelPath) + ".xls")))
            {

            }
        }