[转]C#对Excel报表进行操作（读写和基本操作）

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//1.添加引用-〉com-〉microsoft excel 11.0 //2.若出现错误:命名空间“Microsoft.Office”中不存在类型或命名空间名称“Interop”(是缺少程序集引用吗?) //解决方法：先删除引用中的Excel,然后找到文件Microsoft.Office.Interop.Excel.dll，手动添加该文件的引用   using System; using System.Data; using System.Reflection; using System.IO; using Microsoft.Office.Core; using System.Windows.Forms; using Excel = Microsoft.Office.Interop.Excel;   namespace Wage.Common {     /// <summary>     /// 作者 Li Aimin (原创)     /// 功能描述：C#对Excel报表进行操作     /// 创建时间：2006－01－17, 修改时间：２００７－１－１4     /// 说明：在工程中需要添加 Excel11.0对象库的引用（Office 2000为Excel9.0，Office XP为Excel10.0）；     ///    需要在Dcom中配置Excel应用程序的权限；     ///    服务器需要安装Office2003     /// </summary>     public class ExcelLib     {         //http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dv_wrcore/html/wrgrfexcelapplicationobject.asp         #region Variables         private Excel.Application excelApplication = null;         private Excel.Workbooks excelWorkBooks = null;         private Excel.Workbook excelWorkBook = null;         private Excel.Worksheet excelWorkSheet = null;         private Excel.Range excelRange = null;//Excel Range Object,多种用途         private Excel.Range excelCopySourceRange = null;//Excel Range Object         private int excelActiveWorkSheetIndex;   //活动工作表索引         private string excelOpenFileName = "";  //操作Excel的路径         private string excelSaveFileName = "";  //保存Excel的路径         #endregion           #region Properties         public int ActiveSheetIndex         {             get             {                 return excelActiveWorkSheetIndex;             }             set             {                 excelActiveWorkSheetIndex = value;             }         }         public string OpenFileName         {             get             {                 return excelOpenFileName;             }             set             {                 excelOpenFileName = value;             }         }         public string SaveFileName         {             get             {                 return excelSaveFileName;             }             set             {                 excelSaveFileName = value;             }         }         #endregion           //         //--------------------------------------------------------------------------------------------------------         /// <summary>         /// 构造函数；         /// </summary>         public ExcelLib()         {             excelApplication = null;//Excel Application Object             excelWorkBooks = null;//Workbooks             excelWorkBook = null;//Excel Workbook Object             excelWorkSheet = null;//Excel Worksheet Object             ActiveSheetIndex = 1;   //默认值活动工作簿为第一个；设置活动工作簿请参阅SetActiveWorkSheet()         }         /// <summary>         /// 以excelOpenFileName为模板新建Excel文件         /// </summary>         public bool OpenExcelFile()         {             if (excelApplication != null) CloseExcelApplication();               //检查文件是否存在             if (excelOpenFileName == "")             {                 throw new Exception("请选择文件！");             }             if (!File.Exists(excelOpenFileName))             {                   throw new Exception(excelOpenFileName + "该文件不存在！");//该异常如何处理，由什么处理？？？？             }             try             {                 excelApplication = new Excel.ApplicationClass();                 excelWorkBooks = excelApplication.Workbooks;                 excelWorkBook = ((Excel.Workbook)excelWorkBooks.Open(excelOpenFileName, Missing.Value, true, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value));                 excelWorkSheet = (Excel.Worksheet)excelWorkBook.Worksheets[excelActiveWorkSheetIndex];                 excelApplication.Visible = false;                   return true;             }             catch (Exception e)             {                 CloseExcelApplication();                 MessageBox.Show("(1)没有安装Excel 2003；(2)或没有安装Excel 2003 .NET 可编程性支持；\n详细信息："                     +e.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);                 //throw new Exception(e.Message);                 return false;             }         }                /// <summary>         /// 读取一个Cell的值         /// </summary>         /// <param name="CellRowID">要读取的Cell的行索引</param>         /// <param name="CellColumnID">要读取的Cell的列索引</param>         /// <returns>Cell的值</returns>         public string getOneCellValue(int CellRowID, int CellColumnID)         {             if (CellRowID <= 0)             {                 throw new Exception("行索引超出范围！");             }             string sValue = "";             try             {                 sValue = ((Excel.Range)excelWorkSheet.Cells[CellRowID, CellColumnID]).Text.ToString();             }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }             return (sValue);         }         /// <summary>         /// 读取一个连续区域的Cell的值(矩形区域，包含一行或一列,或多行，多列)，返回一个一维字符串数组。         /// </summary>         /// <param name="StartCell">StartCell是要写入区域的左上角单元格</param>         /// <param name="EndCell">EndCell是要写入区域的右下角单元格</param>         /// <returns>值的集合</returns>         public string[] getCellsValue(string StartCell, string EndCell)         {             string[] sValue = null;             //try             //{             excelRange = (Excel.Range)excelWorkSheet.get_Range(StartCell, EndCell);             sValue = new string[excelRange.Count];             int rowStartIndex = ((Excel.Range)excelWorkSheet.get_Range(StartCell, StartCell)).Row;  //起始行号             int columnStartIndex = ((Excel.Range)excelWorkSheet.get_Range(StartCell, StartCell)).Column; //起始列号             int rowNum = excelRange.Rows.Count;     //行数目             int columnNum = excelRange.Columns.Count;    //列数目             int index = 0;             for (int i = rowStartIndex; i < rowStartIndex + rowNum; i++)             {                 for (int j = columnStartIndex; j < columnNum + columnStartIndex; j++)                 {                     //读到空值null和读到空串""分别处理                     sValue[index] = ((Excel.Range)excelWorkSheet.Cells[i, j]).Text.ToString();                     index++;                 }             }             //}             //catch (Exception e)             //{             //    CloseExcelApplication();             //    throw new Exception(e.Message);             //}               return (sValue);         }           /// <summary>         /// 读取所有单元格的数据(矩形区域)，返回一个datatable.假设所有单元格靠工作表左上区域。         /// </summary>         public DataTable getAllCellsValue()         {             int columnCount = getTotalColumnCount();             int rowCount = getTotalRowCount();             DataTable dt = new DataTable();             //设置datatable列的名称             for (int columnID = 1; columnID <= columnCount; columnID++)             {                 dt.Columns.Add(((Excel.Range)excelWorkSheet.Cells[1, columnID]).Text.ToString());             }               for (int rowID = 2; rowID <= rowCount; rowID++)             {                 DataRow dr = dt.NewRow();                 for (int columnID = 1; columnID <= columnCount; columnID++)                 {                     dr[columnID - 1] = ((Excel.Range)excelWorkSheet.Cells[rowID, columnID]).Text.ToString();                     //读到空值null和读到空串""分别处理                 }                 dt.Rows.Add(dr);             }             return (dt);         }         public int getTotalRowCount()         {//当前活动工作表中有效行数(总行数)             int rowsNumber = 0;             try             {                 while (true)                 {                     if (((Excel.Range)excelWorkSheet.Cells[rowsNumber + 1, 1]).Text.ToString().Trim() == "" &&                            ((Excel.Range)excelWorkSheet.Cells[rowsNumber + 2, 1]).Text.ToString().Trim() == "" &&                            ((Excel.Range)excelWorkSheet.Cells[rowsNumber + 3, 1]).Text.ToString().Trim() == "")                         break;                     rowsNumber++;                 }             }             catch             {                 return -1;             }             return rowsNumber;         }         /// <summary>         /// 当前活动工作表中有效列数(总列数)         /// </summary>         /// <param></param>         public int getTotalColumnCount()         {             int columnNumber = 0;             try             {                 while (true)                 {                     if (((Excel.Range)excelWorkSheet.Cells[1, columnNumber + 1]).Text.ToString().Trim() == "" &&                            ((Excel.Range)excelWorkSheet.Cells[1, columnNumber + 2]).Text.ToString().Trim() == "" &&                            ((Excel.Range)excelWorkSheet.Cells[1, columnNumber + 3]).Text.ToString().Trim() == "")                         break;                     columnNumber++;                 }             }             catch             {                 return -1;             }             return columnNumber;         }           /// <summary>         /// 向一个Cell写入数据         /// </summary>         /// <param name="CellRowID">CellRowID是cell的行索引</param>         /// <param name="CellColumnID">CellColumnID是cell的列索引</param>         ///<param name="Value">要写入该单元格的数据值</param>         public void setOneCellValue(int CellRowID, int CellColumnID, string Value)         {             try             {                 excelRange = (Excel.Range)excelWorkSheet.Cells[CellRowID, CellColumnID];                 excelRange.Value2 = Value;//Value2?                 //Gets or sets the value of the NamedRange control.                 //The only difference between this property and the Value property is that Value2 is not a parameterized property.                 excelRange = null;             }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }         }         /// <summary>         /// 设置活动工作表         /// </summary>         /// <param name="SheetIndex">要设置为活动工作表的索引值</param>         public void SetActiveWorkSheet(int SheetIndex)         {             if (SheetIndex <= 0)             {                 throw new Exception("索引超出范围！");             }             try             {                 ActiveSheetIndex = SheetIndex;                 excelWorkSheet = (Excel.Worksheet)excelWorkBook.Worksheets[ActiveSheetIndex];             }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }         }         /// <summary>         /// 向连续区域一次性写入数据；只有在区域连续和写入的值相同的情况下可以使用方法         /// </summary>         /// <param name="StartCell">StartCell是要写入区域的左上角单元格</param>         /// <param name="EndCell">EndCell是要写入区域的右下角单元格</param>         /// <param name="Value">要写入指定区域所有单元格的数据值</param>         public void setCellsValue(string StartCell, string EndCell, string Value)         {             try             {                 excelRange = excelWorkSheet.get_Range(StartCell, EndCell);                 excelRange.Value2 = Value;                 excelRange = null;             }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }         }         /// <summary>         /// 给一行写数据         /// </summary>         public void setOneLineValues(int LineID, int StartCellColumnID, int EndCellColumnID, string[] Values)////已经测试         {             //用1-19号元素               //if (Values.Length!=EndCellColumnID-StartCellColumnID)             //{             //    throw new Exception("单元格数目与提供的值的数目不一致！");             //}             for (int i = StartCellColumnID; i <= EndCellColumnID; i++)             {                 setOneCellValue(LineID, i, Values[i]);             }         }         public void setCellsBorder(string startCell, string endCell)         {             //设置某个范围内的单元格的边框             excelRange = excelWorkSheet.get_Range(startCell, endCell);             excelRange.Borders[Excel.XlBordersIndex.xlEdgeLeft].LineStyle = Excel.XlLineStyle.xlContinuous;             excelRange.Borders[Excel.XlBordersIndex.xlEdgeTop].LineStyle = Excel.XlLineStyle.xlContinuous;             excelRange.Borders[Excel.XlBordersIndex.xlEdgeRight].LineStyle = Excel.XlLineStyle.xlContinuous;             excelRange.Borders[Excel.XlBordersIndex.xlEdgeBottom].LineStyle = Excel.XlLineStyle.xlContinuous;             excelRange.Borders[Excel.XlBordersIndex.xlInsideVertical].LineStyle = Excel.XlLineStyle.xlContinuous;             //excelRange.Borders[Excel.XlBordersIndex.xlInsideHorizontal].LineStyle = Excel.XlLineStyle.xlContinuous;         }           public void setOneCellBorder(int CellRowID, int CellColumnID)         {             //设置某个单元格的边框             excelRange = (Excel.Range)excelWorkSheet.Cells[CellRowID, CellColumnID];               excelRange.Borders[Excel.XlBordersIndex.xlEdgeLeft].LineStyle = Excel.XlLineStyle.xlContinuous;             excelRange.Borders[Excel.XlBordersIndex.xlEdgeTop].LineStyle = Excel.XlLineStyle.xlContinuous;             excelRange.Borders[Excel.XlBordersIndex.xlEdgeRight].LineStyle = Excel.XlLineStyle.xlContinuous;             excelRange.Borders[Excel.XlBordersIndex.xlEdgeBottom].LineStyle = Excel.XlLineStyle.xlContinuous;             //excelRange.Borders[Excel.XlBordersIndex.xlInsideVertical].LineStyle = Excel.XlLineStyle.xlContinuous;             //excelRange.Borders[Excel.XlBordersIndex.xlInsideHorizontal].LineStyle = Excel.XlLineStyle.xlContinuous;         }                public void SetColumnWidth(string startCell, string endCell, int size)         {             //设置某个范围内的单元格的列的宽度             excelRange = excelWorkSheet.get_Range(startCell, endCell);             excelRange.ColumnWidth = size;         }           public void SetOneCellFont(int CellRowID, int CellColumnID, string fontName, int fontSize)         {             excelRange = (Excel.Range)excelWorkSheet.Cells[CellRowID, CellColumnID];             excelRange.Font.Name = fontName;             excelRange.Font.Size = fontSize;         }           public void SetOneCellHorizontalAlignment(int CellRowID, int CellColumnID, Excel.Constants alignment)         {             excelRange = (Excel.Range)excelWorkSheet.Cells[CellRowID, CellColumnID];             excelRange.HorizontalAlignment = alignment;           }           public void SetOneCellColumnWidth(int CellRowID, int CellColumnID, int size)         {             //设置某个单元格的列的宽度             excelRange = (Excel.Range)excelWorkSheet.Cells[CellRowID, CellColumnID];             excelRange.ColumnWidth = size;           }           /// <summary>         /// 设置一个Cell的数据格式         /// </summary>         /// <param name="CellRowID">CellRowID是cell的行索引</param>         /// <param name="CellColumnID">CellColumnID是cell的列索引</param>         ///<param name="Value">数据格式</param>         public void setOneCellNumberFormat(int CellRowID, int CellColumnID, string numberFormat)         {             try             {                 excelRange = (Excel.Range)excelWorkSheet.Cells[CellRowID, CellColumnID];                 excelRange.NumberFormatLocal = numberFormat;                   excelRange = null;             }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }         }         public void SetRowHeight(string startCell, string endCell, int size)         {             //设置某个范围内的单元格的行的高度             excelRange = excelWorkSheet.get_Range(startCell, endCell);             excelRange.RowHeight = size;           }         public void SetRowHeight(int CellRowID, int CellColumnID, float size)         {             //设置某个范围内的单元格的行的高度             excelRange = (Excel.Range)excelWorkSheet.Cells[CellRowID, CellColumnID];             excelRange.RowHeight = size;           }         public void SetOneCellRowHeight(int CellRowID, int CellColumnID, int size)         {             //设置某个单元格的行的高度             excelRange = (Excel.Range)excelWorkSheet.Cells[CellRowID, CellColumnID];             excelRange.RowHeight = size;           }           /// <summary>         /// 拷贝区域.限制：在同一个工作表中复制         /// </summary>         /// <param name="SourceStart">源区域的左上角单元格</param>         /// <param name="SourceEnd">源区域的右下角单元格</param>         /// <param name="DesStart">目标区域的左上角单元格</param>         /// <param name="DesEnd">目标区域的右下角单元格</param>         public void CopyCells(string SourceStart, string SourceEnd, string DesStart, string DesEnd)         {             try             {                 excelCopySourceRange = excelWorkSheet.get_Range(SourceStart, SourceEnd);                 excelRange = excelWorkSheet.get_Range(DesStart, DesEnd);                 excelCopySourceRange.Copy(excelRange);                   excelCopySourceRange = null;                 excelRange = null;             }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }         }         public void CopyWorksheet(int SourceWorksheetIndex, int DesWorksheetIndex)         {             try             {                 //           Sheets("Sheet2").Select                 //Sheets("Sheet2").Copy After:=Sheets(3)                 Excel.Worksheet sheetSource = (Excel.Worksheet)excelWorkBook.Worksheets[SourceWorksheetIndex];                 sheetSource.Select(Missing.Value);                 Excel.Worksheet sheetDest = (Excel.Worksheet)excelWorkBook.Worksheets[DesWorksheetIndex];                 sheetSource.Copy(Missing.Value, sheetDest);             }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }         }           /// <summary>         /// 插入一行         /// </summary>         /// <param name="CellRowID">要插入所在行的索引位置，插入后其原有行下移</param>         /// <param name="RowNum">要插入行的个数</param>         public void InsertRow(int CellRowID, int RowNum)//插入空行         {             if (CellRowID <= 0)             {                 throw new Exception("行索引超出范围！");             }             if (RowNum <= 0)             {                 throw new Exception("插入行数无效！");             }             try             {                 excelRange = (Excel.Range)excelWorkSheet.Rows[CellRowID, Missing.Value];                 for (int i = 0; i < RowNum; i++)                 {                     excelRange.Insert(Excel.XlDirection.xlDown, Missing.Value);                 }                 excelRange = null;             }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }         }           /// <summary>         /// 保存Excel文件         /// </summary>           public Excel.Range FindFirstRange(Excel.Range xlRange, string FindText)//查找//没有测试         {             //查找第一个满足的区域             //Search for the first match             Excel.Range firstFind = null;             firstFind = xlRange.Find(FindText, Missing.Value, Excel.XlFindLookIn.xlValues, Excel.XlLookAt.xlPart, Excel.XlSearchOrder.xlByRows, Excel.XlSearchDirection.xlNext, false, Missing.Value, Missing.Value);             return firstFind;  //如果没找到，返回空         }         //http://msdn.microsoft.com/library/en-us/dv_wrcore/html/wrtskHowToSearchForTextInWorksheetRanges.asp?frame=true             /// <summary>         /// 当前活动工作表中有效行数(总行数)         /// </summary>         /// <param></param>                /// <summary>         /// 判断单元格是否有数据         /// </summary>         public bool CellValueIsNull(int CellLineID, int CellColumnID)////已经测试         {               //判断单元格是否有数据             if ((((Excel.Range)excelWorkSheet.Cells[CellLineID, CellColumnID]).Text.ToString().Trim() != ""))                 return false;             return true;         }                public void newWorkbook(string excelTemplate, string fileName)         {             //以excelTemplate为模板新建文件fileName             //excelApplication.             excelWorkBook = excelWorkBooks.Add(excelTemplate);             SaveFileName = "";             SaveExcel();         }         public void newWorksheet()         {             excelWorkBook.Worksheets.Add(Missing.Value, Missing.Value, 1, Missing.Value);         }         public void setWorksheetName(int sheetIndex, string worksheetName)         {             // Missing.Value             Excel._Worksheet sheet = (Excel._Worksheet)(excelWorkBook.Worksheets[(object)sheetIndex]);             sheet.Name = worksheetName;         }           public void mergeOneLineCells(string startCell, string endCell)         {             //合并一行单元格             excelRange = excelWorkSheet.get_Range(startCell, endCell);             //excelRange.Merge(true);             excelRange.MergeCells = true;         }           public void HorizontalAlignmentCells(string startCell, string endCell, Excel.Constants alignment)         {             //水平对齐一行单元格             excelRange = excelWorkSheet.get_Range(startCell, endCell);             excelRange.HorizontalAlignment = alignment;         }           public void VerticalAlignmentCells(string startCell, string endCell, Excel.Constants alignment)         {             //垂直对齐一行单元格             excelRange = excelWorkSheet.get_Range(startCell, endCell);             excelRange.VerticalAlignment = alignment;         }                //实现列号-〉字母 (26-〉Z,27->AA)         private string ConvertColumnIndexToChar(int columnIndex)         {             if (columnIndex < 1 || columnIndex > 256)             {                 MessageBox.Show("columnIndex=" + columnIndex + ",超出了有效范围（1-256）");                 return "A";             }             if (columnIndex >= 1 && columnIndex <= 26)//1--26             {                 return "AA";             }             if (columnIndex >= 27 && columnIndex <= 256)//27--256             {                 return "AA";             }             return "A";         }         //字母-〉列号 Z-〉26         public void SaveExcel()         {             if (excelSaveFileName == "")             {                 throw new Exception("未指定要保存的文件名");             }             try             {                 //excelWorkSheet.SaveAs(excelSaveFileName, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value);                 excelWorkSheet.SaveAs(excelSaveFileName, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value);               }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }         }           //--------------------------------------------------------------------------------------------------------         /// <summary>         /// 保存Excel文件，格式xml.         /// </summary>         public void SaveExcelAsXML()         {             if (excelSaveFileName == "")             {                 throw new Exception("未指定要保存的文件名");             }             try             {                 //excelWorkSheet.SaveAs(excelSaveFileName, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value);                 excelWorkSheet.SaveAs(excelSaveFileName, Microsoft.Office.Interop.Excel.XlFileFormat.xlXMLSpreadsheet, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value);               }             catch (Exception e)             {                 CloseExcelApplication();                 throw new Exception(e.Message);             }         }         //--------------------------------------------------------------------------------------------------------         /// <summary>         /// 关闭Excel文件，释放对象；最后一定要调用此函数，否则会引起异常         /// </summary>         /// <param></param>         public void CloseExcelApplication()         {             try             {                 excelWorkBooks = null;                 excelWorkBook = null;                 excelWorkSheet = null;                 excelRange = null;                 if (excelApplication != null)                 {                     excelApplication.Workbooks.Close();                     //Object missing = Type.Missing;                     excelApplication.Quit();                     excelApplication = null;                     //ReleaseAllRef(excelApplication);//Error                   }             }             finally             {                 GC.Collect();                 GC.WaitForPendingFinalizers();                 GC.Collect();                 GC.WaitForPendingFinalizers();             }         }         private void ReleaseAllRef(Object obj)         {//ReleaseComObject()方法可以使RCW减少一个对COM组件的引用，并返回减少一个引用后RCW对COM组件的剩余引用数量。             //我们用一个循环，就可以让RCW将所有对COM组件的引用全部去掉。             try             {                 while (System.Runtime.InteropServices.Marshal.ReleaseComObject(obj) > 1) ;             }             finally             {                 obj = null;             }         }       } }

　　

无法嵌入互操作类型“Microsoft.Office.Interop.Excel.ApplicationClass”。请改用适用的接口。
 
winform下对datagridview进行导出时候，写了一句：
 Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.ApplicationClass();

导致结果如下：

类型“Microsoft.Office.Interop.Excel.ApplicationClass”未定义构造函数    
无法嵌入互操作类型“Microsoft.Office.Interop.Excel.ApplicationClass”。请改用适用的接口。

解决办法是将引用的DLL：Microsoft.Office.Interop.Excel;的嵌入互操作类型改为false,就可以了。


下载地址：https://files.cnblogs.com/files/emanlee/ExcelLib.rar

转载链接：http://www.cnblogs.com/emanlee/archive/2007/05/31/766520.html


引用代码

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static void Main(string[] args) {     ExcelLib excel = new ExcelLib();     excel.OpenFileName = @"C:\Users\lc\Desktop\test.xlsx";     excel.SaveFileName = @"C:\Users\lc\Desktop\test002.xlsx";     excel.OpenExcelFile();     int columns = excel.getTotalColumnCount();     int rows = excel.getTotalRowCount();     string value = excel.getOneCellValue(1, 1);     for (int row = 1; row <= rows; row++)     {         for (int column = 1; column <= columns; column++)         {             string xx = excel.getOneCellValue(row, column);             Console.WriteLine(xx);         }     }       excel.setOneCellValue(4, 4, "xyz222");     excel.SaveExcel(); }