RDLC - 后台代码直接导出Excel/PDF/Word格式

//自动导出excel/pdf/word
private void ResponseFile(int oType, string fileName)
{
    string outType;
    if (oType == 0)
    {
        outType = "Excel";
    }
    else if (oType == 1)
    {
        outType = "Word";
    }
    else
    {
        outType = "Word";
    }
    try
    {
        Warning[] warnings;
        string[] streamids;

        string mimeType;
        string encoding;
        string extension;

        byte[] bytes = ReportViewer1.LocalReport.Render(
                outType, null, out mimeType, out encoding, out extension,
                out streamids, out warnings);
        Response.Clear();
        Response.Buffer = true;
        Response.ContentType = mimeType;
        Response.AddHeader("content-disposition", "attachment;filename=" + fileName + "." + extension);
        Response.BinaryWrite(bytes);

        Response.Flush(); 
    } 
    catch (Exception ex)
    {
        throw new Exception(ex.Message);
    }
}