C#读取Excel方法

 方法一：使用OleDb

   using System.Data.OleDb

    /// <summary>
    /// 返回Excel数据源
    /// </summary>
    /// <param name="filename">文件路径</param>
    /// <returns></returns>
    static public DataSet ExcelToDataSet(string filename)
    {
        DataSet ds;
        string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;" +
                        "Extended Properties=Excel 8.0;" +
                        "data source=" + filename;
        OleDbConnection myConn = new OleDbConnection(strCon);
        string strCom = " SELECT * FROM [Sheet1$]";
        myConn.Open();
        OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, myConn);
        ds = new DataSet();
        myCommand.Fill(ds);
        myConn.Close();
        return ds;
    }

方法二： 使用COM

    导入Microsoft.Excel
    using Excel= Microsoft.Office.Interop.Excel;
    using System.Diagnostics;

    public class ExcelHelper
    {
        private Excel._Application excelApp;
        private string fileName = string.Empty;
        private Excel.WorkbookClass wbclass;
        public ExcelHelper(string _filename)
        {
            excelApp = new Excel.Application();
            object objOpt = System.Reflection.Missing.Value;
            wbclass = (Excel.WorkbookClass)excelApp.Workbooks.Open(_filename, objOpt, false, objOpt, objOpt, objOpt, true, objOpt, objOpt, true, objOpt, objOpt, objOpt, objOpt, objOpt);
        }
        /**/
        /// <summary>
        /// 所有sheet的名称列表
        /// </summary>
        /// <returns></returns>
        public List<string> GetSheetNames()
        {
            List<string> list = new List<string>();
            Excel.Sheets sheets = wbclass.Worksheets;
            string sheetNams = string.Empty;
            foreach (Excel.Worksheet sheet in sheets)
            {
                list.Add(sheet.Name);
            }
            return list;
        }
        public Excel.Worksheet GetWorksheetByName(string name)
        {
            Excel.Worksheet sheet = null;
            Excel.Sheets sheets = wbclass.Worksheets;
            foreach (Excel.Worksheet s in sheets)
            {
                if (s.Name == name)
                {
                    sheet = s;
                    break;
                }
            }
            return sheet;
        }
        /**/
        /// <summary>
        ///
        /// </summary>
        /// <param name="sheetName">sheet名称</param>
        /// <returns></returns>
        public Array GetContent(string sheetName)
        {
            Excel.Worksheet sheet = GetWorksheetByName(sheetName);
            //获取A1 到AM24范围的单元格
            Excel.Range rang = sheet.get_Range("A1", "AM24");
            //读一个单元格内容
            //sheet.get_Range("A1", Type.Missing);
            //不为空的区域,列,行数目
            //   int l = sheet.UsedRange.Columns.Count;
            // int w = sheet.UsedRange.Rows.Count;
            //  object[,] dell = sheet.UsedRange.get_Value(Missing.Value) as object[,];
            System.Array values = (Array)rang.Cells.Value2;
            return values;
        }

        public void Close()
        {
            excelApp.Quit();
            excelApp = null;
        }

    }

 转自：http://www.cnblogs.com/seaboy/archive/2008/10/16/1312512.html