Excel转换成xml文件

namespace ExcelToXml
{
    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            Program program = new Program();
            DataSet dataSet= program.getData();
            Program.ConvertDataSetToXMLFile(dataSet,"D:\\"+dataSet.DataSetName+".xml");
        }
        public DataSet getData()
        {
            //打开文件
            OpenFileDialog file = new OpenFileDialog();
            file.Filter = "Excel(*.xlsx)|*.xlsx|Excel(*.xls)|*.xls";
            file.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            file.Multiselect = false;
            if (file.ShowDialog() == DialogResult.Cancel)
                return null;
            //判断文件后缀
            var path = file.FileName;
            
            string name = Path.GetFileNameWithoutExtension(path);
            string fileSuffix = System.IO.Path.GetExtension(path);
            if (string.IsNullOrEmpty(fileSuffix))
                return null;


            ////加载Excel
            //Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();  //获取权限
            //Microsoft.Office.Interop.Excel.Workbooks workbooks = app.Workbooks;
            //Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(path);
            //Microsoft.Office.Interop.Excel.Sheets sheet = workbook.Sheets;
            //Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)sheet.get_Item(1);//获取sheet  (1)为第一个sheet         
            //double usedRows = app.WorksheetFunction.CountA(worksheet.Columns[3]); //第3列的行数          
            //string num = usedRows.ToString();

            //object[,] twoDoubleList = worksheet.Range["A1:AH" + num].Value2; //获取数组

            using (DataSet ds = new DataSet())
            {

                //判断Excel文件是2003版本还是2007版本
                string connString = ""; //server=.;database=ExcelToXml;integrated security=SSPI
                if (fileSuffix == ".xls")
                    connString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + path + ";" + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\"";
                else
                    connString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + path + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1\"";
                //读取文件
                string sql_select = " SELECT * FROM [Sheet1$]";
                using (OleDbConnection conn = new OleDbConnection(connString))
                using (OleDbDataAdapter cmd = new OleDbDataAdapter(sql_select, conn))
                {
                    conn.Open();
                    cmd.Fill(ds);
                    ds.DataSetName = name;
                }
                if (ds == null || ds.Tables.Count <= 0) return null;
                return ds;
            }
        }

        
        public static void ConvertDataSetToXMLFile(DataSet xmlDS, string xmlFile)
        {
            MemoryStream stream = null;
            XmlTextWriter writer = null;
            try
            {
                stream = new MemoryStream();
                //从stream装载到XmlTextReader
                writer = new XmlTextWriter(stream, Encoding.Unicode);
                //用WriteXml方法写入文件.
                xmlDS.WriteXml(writer);
                int count = (int)stream.Length;
                byte[] arr = new byte[count];
                stream.Seek(0, SeekOrigin.Begin);
                stream.Read(arr, 0, count);
                //返回Unicode编码的文本
                UnicodeEncoding utf = new UnicodeEncoding();
                StreamWriter sw = new StreamWriter(xmlFile);
                sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
                sw.WriteLine(utf.GetString(arr).Trim());
                sw.Close();
            }
            catch (System.Exception ex)
            {
                //throw ex;
                MessageBox.Show(ex.Message);
                //Console.WriteLine(ex.Message);
                //Console.ReadLine();
            }
            finally
            {
                if (writer != null) writer.Close();
            }
        }

    }
}