C#操作Excel

//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, Missing.Value, 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);
            }
        }