C# 读写Excel

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昨天公司一个部门要个小程序，要读写Excel,在网上搜了不少资料，结果程序做完了却在网上发现一个c#读写Excel的类，收藏了，呵呵
//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：李爱民 
    /// 功能描述：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);
            }
        }
        /// <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;
            }
        }
    }
}