C# ----Excel读取数据之数据引擎方法

读取Excel表数据，可以使用连接Excel数据引擎的方法

代码如下：

        /// <summary>

        /// excel转换为DataTable

        /// </summary>

        /// <param name="filename">excel文件名称</param>

        /// <param name="sheet">excel表单名称</param>

        /// <returns></returns>

        private DataTable ExcelToDataTable(string filename,string sheet)

        {

            DataTable dt = new DataTable();

            //判断文件是否存在

            if (!File.Exists(filename))

            {

                DevExpress.XtraEditors.XtraMessageBox.Show(filename + "file don't exist!");

            }

            else

            {

                //文件后缀名获取

                string extension = Path.GetExtension(filename);

                //excel数据引擎连接字符串

                string strConn = "";

                if (extension == ".xls")

                {

                    strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filename + ";Extended Properties=Excel 8.0;";

                }

                else if (extension == ".xlsx")

                {

                    strConn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filename + ";Extended Properties=\"Excel 12.0 Xml;HDR=No\"";

                }



                ArrayList sheetList = new ArrayList();

                //获取表单列表

                sheetList = ExcelTables(filename,strConn);

                //如果数据表单名不存在，取EXCEL中第一个数据表单

                if (sheetList.IndexOf(sheet) < 0)

                {

                    sheet = sheetList[0].ToString().Trim();

                }

                //建立excel数据引擎连接

                System.Data.OleDb.OleDbConnection dbconn = new System.Data.OleDb.OleDbConnection(strConn);

                //查询表命令

                System.Data.OleDb.OleDbCommand cmd = new System.Data.OleDb.OleDbCommand("select * from [" + sheet + "$]", dbconn);

                System.Data.OleDb.OleDbDataAdapter adapter = new System.Data.OleDb.OleDbDataAdapter(cmd);

                try

                {

                    if (dbconn.State == ConnectionState.Closed)

                    {

                        dbconn.Open();

                    }

                    adapter.Fill(dt);

                }

                catch (Exception ex)

                {

                    throw ex;

                }

                finally

                {

                    if (dbconn.State == ConnectionState.Open)

                    {

                        dbconn.Close();

                    }

                }

            }

            return dt;

        }

        /// <summary>

        /// 获取Excel表单列表

        /// </summary>

        /// <param name="filename"></param>

        /// <returns></returns>

        private ArrayList ExcelTables(string filename,string strConn)

        {

            DataTable dt = new DataTable();

            ArrayList sheetList = new ArrayList();

            //判断文件名是否存在以及连接字符串是否正确

            if (File.Exists(filename)&&!string.IsNullOrEmpty(strConn))

            {

                using (System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection(strConn))

                {

                    try

                    {

                        conn.Open();

                        //返回excel数据引擎的架构信息

                        dt = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });

                    }

                    catch (Exception ex)

                    {

                        throw ex;

                    }



                    int sheetCount = dt.Rows.Count;

                    //获取excel表单列表

                    for (int i = 0; i < sheetCount; i++)

                    {

                        string tablename = dt.Rows[i][2].ToString().Trim().TrimEnd('$');

                        if (sheetList.IndexOf(tablename) < 0)

                        {

                            sheetList.Add(tablename);

                        }

                    }

                }

            }

            return sheetList;

        }

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