将DataSet里所有数据导入Excel

        /**//// <summary>
        /// 将DataSet里所有数据导入Excel
        /// 需要添加COM: Microsoft Excel Object Library
        /// using Excel;
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <param name="ds">需要转存的DataSet</param>
        public static void ExportToExcel(string filePath, DataSet ds)
        ...{
            object oMissing = System.Reflection.Missing.Value;
            Excel.ApplicationClass xlApp = new Excel.ApplicationClass();
            try
            ...{
                // 打开Excel文件。以下为Office 2000.
                Excel.Workbook xlWorkbook =
                    xlApp.Workbooks.Open(filePath, oMissing, oMissing,
                                          oMissing, oMissing, oMissing,
                                          oMissing, oMissing, oMissing,
                                          oMissing, oMissing, oMissing,
                                          oMissing);
 
                Excel.Worksheet xlWorksheet;
                // 循环所有DataTable
                for( int i=0; i<ds.Tables.Count; i++ )
                ...{
                    // 添加入一个新的Sheet页
                    xlWorksheet = (Excel.Worksheet)xlWorkbook.Worksheets.Add(oMissing,oMissing,1,oMissing);
 
                    // 以TableName作为新加的Sheet页名
                    xlWorksheet.Name = ds.Tables[i].TableName;
 
                    // 取出这个DataTable中的所有值,暂存于stringBuffer中
                    System.Text.StringBuilder stringBuffer = new System.Text.StringBuilder();
 
                    for( int j=0; j<ds.Tables[i].Rows.Count; j++ )
                    ...{
                        for( int k=0; k<ds.Tables[i].Columns.Count; k++ )
                        ...{

                                stringBuffer.Append((string)ds.Tables[i].Rows[j][k]);
                            if( k < ds.Tables[i].Columns.Count - 1 )
                                stringBuffer.Append("/t");
                        }
                        stringBuffer.Append("/n");
                    }
                    // 利用系统剪切板
                    System.Windows.Forms.Clipboard.SetDataObject("");
 
                    // 将stringBuffer放入剪切板
                    System.Windows.Forms.Clipboard.SetDataObject(stringBuffer);
 
                    // 选中这个sheet页中的第一个单元格（下标从1开始）
                    ((Excel.Range)xlWorksheet.Cells[1,1]).Select();
 
                    // 将剪切板里的内容粘贴在Sheet中
                    xlWorksheet.Paste(oMissing,oMissing);
 
                    // 清空系统剪切板
                    System.Windows.Forms.Clipboard.SetDataObject("");
                }
 
                // 保存并关闭这个工作簿
                xlWorkbook.Close( Excel.XlSaveAction.xlSaveChanges, oMissing, oMissing );
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkbook);
                xlWorkbook = null;
            }
            catch(Exception ex)           
            ...{
                MessageBox.Show(ex.Message);
            }
            finally
            ...{
                // 释放COM对象
                xlApp.Quit();
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
                GC.Collect();
            }
        }