//报表定义

ReportViewer reportViewer = new ReportViewer();

//报表数据源

ReportDataSource datasource = null;

    //设置数据

    DataSet ds = null;  //请自行绑定数据

//指定报表模板地址

reportViewer.LocalReport.ReportPath = Server.MapPath("temp.rdlc");

//报表数据源设置

datasource = new ReportDataSource("TshirtMugData_Tshirt", ds.Tables[0]);

// 报表参数

ReportParameter[] reportpara = new ReportParameter[2];

reportpara[0] = new ReportParameter("Date", Date);

reportViewer.LocalReport.SetParameters(reportpara);

reportViewer.Visible = true;

// 写Excel文件

byte[] bytes = reportViewer.LocalReport.Render("Excel", null, out strMimeType, out strEncoding, out strFileNameExtension, out strStreamIds, out warnings);

if (!System.IO.File.Exists(filepath + filename))

{

    using (System.IO.FileStream fs = new System.IO.FileStream(filepath + filename, System.IO.FileMode.Create))

    {

        //写入文件

        fs.Write(bytes, 0, bytes.Length);

    }

}