用rdlc文件直接导出到excel或PDF

private DataTable LoadSalesData()
        {
            // Load data from XML file.
            DataSet dataSet = new DataSet();
            dataSet.ReadXml(@"c:/Reports/data.xml" );
            return dataSet.Tables[0];
        }
       
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this .reportViewer1.ProcessingMode = ProcessingMode.Local;
            this .reportViewer1.LocalReport.ReportPath = @"c:/Reports/Report1.rdl" ;
            reportViewer1.LocalReport.DataSources.Add(
            new ReportDataSource("Sales" , LoadSalesData()));
            this .reportViewer1.RefreshReport();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Warning[] warnings;
            string [] streamids;
            string mimeType;
            string encoding;
            string extension;

            byte[] bytes = reportViewer1.LocalReport.Render(
               "Excel" , null , out mimeType, out encoding, out extension,
               out streamids, out warnings);

            FileStream fs = new FileStream(@"c:/output.xls" , FileMode.Create);
            fs.Write(bytes, 0, bytes.Length);
            fs.Close();

            MessageBox.Show("Report exported to output.xls" , "Info" );

        }