接我上一篇C#導出Excel源碼.
網上反應比較強烈。本人也因為工作需要的原因，將其封裝了成了ExcelManager。企業當中，做報表的數據來源肯定就是數據庫了。該ExcelManager目前只提供Ms Sql Server的支持，因為我們公司使用的就是ms sql server 2000 了。封裝后的ExcelManager，你只需傳入你的報表表頭（一級表頭、二級表頭。大部分有兩級也就夠了。如果你有多個，可自行修改該類.）,并將對應的數據庫表字段傳入類庫中的方法DeclareExcelApp即可。
同前一篇一樣，你可將下面代碼復制另存一個新類就可以了（不知為什么，我在家里上網老是傳附件不上來！faint...）。隨后，我會給出一個調用的方法的：
namespace ExportToExcel
{
    using System;
    using System.Data;
    using System.Data.SqlClient;
    using System.Windows.Forms;
    using System.Runtime.InteropServices;

    /***********************************************************************************
     ****Class Name :   ExcelManger
     ****Author:            KingNa
     ****Create Date :   2006-9-1
     ****CopyRight:     Reserve this info if you want to User this Class
    ***********************************************************************************/
    public class ExcelManager:IDisposable
    {
        Excel.Range m_objRange = null;
        Excel.application m_objExcel = null;
        Excel.Workbooks m_objBooks = null;
        Excel._Workbook m_objBook = null;
        Excel.Sheets m_objSheets = null;
        Excel._Worksheet m_objSheet = null;
        Excel.QueryTable m_objQryTable = null;
        object m_objOpt = System.Reflection.Missing.Value;
        //DataBase-used variable
        PRivate System.Data.SqlClient.SqlConnection sqlConn = null;
        private string strConnect = string.Empty;
        private System.Data.SqlClient.SqlCommand sqlCmd = null;

        //Sheets variable
        private double dbSheetSize = 65535;//the hight limit number in one sheet
        private int intSheetTotalSize = 0;//total record can divied sheet number
        private double dbTotalSize = 0;//record total number

        /// <summary>
        /// 建構函數
        /// </summary>
        public ExcelManager(){}

        /// <summary>
        /// 建構函數
        /// </summary>
        /// <param name="dbHL">一個Excel表格的最大記錄數</param>
        /// <param name="dbTotal">該數據庫表共查詢出多少條記錄</param>
        /// <param name="intDivide">查詢出的記錄可分成幾個Excel</param>
        /// <param name="conn">sqlConnection</param>
        public ExcelManager(Double dbHL,Double dbTotal,int intDivide,SqlConnection conn )
        {
            dbSheetSize = dbHL;
            intSheetTotalSize = intDivide;
            dbTotalSize = dbTotal;
            sqlConn = conn;
        }
        /// <summary>
        /// 建構函數
        /// </summary>
        /// <param name="dbHL">一個Excel表格的最大記錄數</param>
        /// <param name="strTableName">需查詢的數據庫的表名</param>
        /// <param name="conn">sqlConnection</param>
        public ExcelManager(Double dbHL,string strTableName,SqlConnection conn)
        {
            dbSheetSize = dbHL;
            sqlConn = conn;
            intSheetTotalSize = GetTotalSize(strTableName,sqlConn);
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
        private void Dispose(bool disposing)
        {
            if(disposing)
            {
                // Dispose managed resources.
                Marshal.FinalReleaseComObject(m_objExcel);
                m_objRange = null;
                m_objSheet = null;
                m_objSheets = null;
                m_objBooks = null;
                m_objBook = null;
                m_objExcel = null;
            }
        }
        /// <summary>
        /// 取得總記錄數跟可分成幾個Excel sheet.
        /// </summary>
        /// <param name="strTableName">被查詢的數據庫的表名</param>
        /// <param name="sqlConn">sqlConnection</param>
        /// <returns>可分成Excel Sheet的個數</returns>
        private int GetTotalSize(string strTableName,SqlConnection sqlConn)
        {
            //sqlConn = new System.Data.SqlClient.SqlConnection(strConnect);
            sqlCmd = new System.Data.SqlClient.SqlCommand("Select Count(*) From "+strTableName, sqlConn);
            if(this.sqlConn.State == ConnectionState.Closed) sqlConn.Open();
            dbTotalSize = (int)sqlCmd.ExecuteScalar();
            sqlConn.Close();
            return (int)Math.Ceiling(dbTotalSize / this.dbSheetSize);
        }

        /// <summary>
        /// 新建一個Excel實例
        /// </summary>
        /// <param name="strTitle">Excel表頭上的文字</param>
        public void DeclareExcelApp(string[] strTitle,string strSql,string strTableName,string strMastTitle)
        {
            m_objExcel = new Excel.ApplicationClass();
            m_objExcel.Visible = true;
            m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
            m_objBook = (Excel._Workbook)(m_objBooks.Add(m_objOpt));
            m_objSheets = (Excel.Sheets)m_objBook.Worksheets;
            if (intSheetTotalSize <= 3)
            {
                if (this.dbTotalSize <= this.dbSheetSize)
                {
                    this.ExportDataByQueryTable(1, false,strTitle,strSql,strTableName,strMastTitle );
                    return;
                }
                else if (this.dbTotalSize <= this.dbSheetSize * 2)
                {
                    this.ExportDataByQueryTable(1, false,strTitle,strSql,strTableName,strMastTitle );
                    this.ExportDataByQueryTable(2, true,strTitle,strSql,strTableName,strMastTitle );
                    return;
                }
                else
                {
                    this.ExportDataByQueryTable(1, false,strTitle,strSql,strTableName,strMastTitle );
                    this.ExportDataByQueryTable(2, true,strTitle,strSql,strTableName,strMastTitle );
                    this.ExportDataByQueryTable(3, true,strTitle,strSql,strTableName,strMastTitle );
                    return;
                }
            }
            for (int i = 3; i < intSheetTotalSize; i++)
            {
                m_objSheets.Add(m_objOpt, m_objSheets.get_Item(i), m_objOpt, m_objOpt);
            }
            ExportDataByQueryTable(1, false,strTitle,strSql,strTableName,strMastTitle );
            for (int i = 2; i <= m_objSheets.Count; i++)
            {
                ExportDataByQueryTable(i, true,strTitle,strSql,strTableName,strMastTitle );
            }
        }
        /// <summary>
        /// 以用戶輸入的文件名保存文件
        /// </summary>
        public void SaveExcelApp()
        {
            string excelFileName = string.Empty;
            SaveFileDialog sf = new SaveFileDialog();
            sf.Filter = "*.xls|*.*";
            if (sf.ShowDialog() == DialogResult.OK)
            {
                excelFileName = sf.FileName;
            }
            else
            {
                return;
            }
            m_objBook.SaveAs(excelFileName, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt,
                Excel.XlSaveAsaccessMode.xlNoChange, m_objOpt, m_objOpt, m_objOpt, m_objOpt,m_objOpt);
            if (m_objExcel != null)
                m_objExcel = null;
        }
        /// <summary>
        /// 利用Excel的QueryTable導出數據
        /// </summary>
        /// <param name="intSheetNumber">導出第幾個sheet</param>
        /// <param name="blIsMoreThan">余下的數據是否大于指定的每個Sheet的最大記錄數</param>
        /// <param name="strTitle">表頭,需與查詢sql語句對齊一致。</param>
        /// <param name="strSql">查詢的sql語句，表頭的文字需與該sql語句對齊一致。</param>
        /// <param name="strTablName">查詢的表名</param>   
        /// <param name="strMastTitle">主標題</param>
        /// </summary>
        public void ExportDataByQueryTable(int intSheetNumber, bool blIsMoreThan,string[] strTitle,string strSql,string strTablName,string strMastTitle)
        {
            string strQuery = string.Empty;
            if (blIsMoreThan)
            {
                strQuery = "Select Top " +
                    this.dbSheetSize + strSql + "  From " + strTablName + " Where Not  OrderID In (Select Top " +
                    dbSheetSize * (intSheetNumber - 1) + "  OrderID From " + strTablName + ")";
            }
            else
            {
                strQuery = "Select Top " + this.dbSheetSize + strSql+ "  From "+strTablName;

            }
            m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(intSheetNumber));

            m_objSheet.Cells[1,1] = strMastTitle;
            m_objSheet.Cells[2,1] = "打印日期"+DateTime.Now.ToShortDateString();
            for(int i = 1;i<=strTitle.Length;i++)
            {
                m_objSheet.Cells[4,i] = strTitle[i-1].ToString();
            }
            m_objRange = m_objSheet.get_Range("A5", m_objOpt);
            m_objQryTable = m_objSheet.QueryTables.Add("OLEDB;Provider=SQLOLEDB.1;" + sqlConn.ConnectionString, m_objRange, strQuery);
            m_objQryTable.RefreshStyle = Excel.XlCellInsertionMode.xlInsertEntireRows;
            m_objQryTable.FieldNames = false;
            m_objQryTable.Refresh(false);
        }
    }
}

全盤復制另存新類后，調用方法示例如下：
        private void button2_Click(object sender, EventArgs e)
        {
            #region ExcelManager封裝類導出Excel
            String strConnet ="Data Source='localhost';PassWord = ;User ID=sa;Initial Catalog=Northwind";
            System.Data.SqlClient.SqlConnection sqlConn =
                new System.Data.SqlClient.SqlConnection(strConnet);
            ExcelManager exc = new ExcelManager(65530, "Orders", sqlConn);
            try
            {
                exc.DeclareExcelApp(new string[] { "編號","供應商編號" }, " OrderID,CustomerID ", "Orders", "報表標題");
                //exc.SaveExcelApp();
            }
            catch(Exception E)
            {
                MessageBox.Show(E.ToString());
            }
            finally
            {
                exc.Dispose();
            }
            #endregion
        }
以上使用的是Excel 2002 英文版。2003有些方法稍有出入?？蓞⒄涨捌腃#導出Excel源碼。另外，如果可能的話，我將封裝其它數據庫類型的Excel導出。有興趣的朋友，請繼續關繼！
http://www.49028c.com/jinliangliu/archive/2006/09/01/492633.html