C#读取Excel,或者多个excel表，返回dataset

把excel 表作为一个数据源进行读取

 /// <summary>
        /// 读取Excel单个Sheet
        /// </summary>
        /// <param name="Path">Excel路径</param>
        /// <returns>返回dataset</returns>
        public DataSet ExcelToDS(string Path)
        {
            string filename = "sheet1";//可以指定excel  sheet
            string strConn = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR=Yes;IMEX=1;'", Path);
            //string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties=Excel 8.0;";
            OleDbConnection conn = new OleDbConnection(strConn);
            conn.Open();
            string strExcel = "";
            OleDbDataAdapter myCommand = null;
            DataSet ds = null;
            strExcel = string.Format("select * from [{0}$]", filename);
            myCommand = new OleDbDataAdapter(strExcel, strConn);
            ds = new DataSet();
            myCommand.Fill(ds, "table1");
            return ds;
        }

一个excel存在多表读取方法

 /// <summary>
        ///  读取Excel多个Sheet
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <param name="fileName">文件名称</param>
        /// <returns></returns>
        public static DataSet ToDataTable(string filePath,string fileName)
        {
         
            string connStr = "";
            string fileType = System.IO.Path.GetExtension(fileName);
            if (string.IsNullOrEmpty(fileType)) return null;

            if (fileType == ".xls")
                connStr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + filePath + ";" + ";Extended Properties="Excel 8.0;HDR=YES;IMEX=1"";
            else
                connStr = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + filePath + ";" + ";Extended Properties="Excel 12.0;HDR=YES;IMEX=1"";
            string sql_F = "Select * FROM [{0}]";

            OleDbConnection conn = null;
            OleDbDataAdapter da = null;
            DataTable dtSheetName = null;

            DataSet ds = new DataSet();
            try
            {
                // 初始化连接，并打开
                conn = new OleDbConnection(connStr);
                conn.Open();

                // 获取数据源的表定义元数据                        
                string SheetName = "";
                dtSheetName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
                dtSheetName.DefaultView.Sort = "TABLE_NAME";//针对excel进行排序，
                // 初始化适配器
                da = new OleDbDataAdapter();
                for (int i = 1; i < dtSheetName.Rows.Count; i++)
                {
                    SheetName = (string)dtSheetName.Rows[i]["TABLE_NAME"];

                    if (SheetName.Contains("$") && !SheetName.Replace("'", "").EndsWith("$"))
                    {
                        continue;
                    }

                    da.SelectCommand = new OleDbCommand(String.Format(sql_F, SheetName), conn);
                    DataSet dsItem = new DataSet();
                    da.Fill(dsItem, SheetName);

                    ds.Tables.Add(dsItem.Tables[0].Copy());
                }
            }
            catch (Exception ex)
            {
            }
            finally
            {
                // 关闭连接
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                    da.Dispose();
                    conn.Dispose();
                }
            }
            return ds;
        }