水晶报表导出为pdf, word , excel 格式（已经测试过，实现了该功能）

using System;
using System.Collections;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using CrystalDecisions.Shared;
using CrystalDecisions.CrystalReports.Engine;
using System.IO;
using Ghy.Funds.FundsClassLibrary;
using System.Data.SqlClient;

namespace WebAppTest
{
 /// <summary>
 /// WebForm1 的摘要说明。
 /// </summary>
 public class WebForm1 : System.Web.UI.Page
 {
  protected CrystalDecisions.Web.CrystalReportViewer CrystalReportViewer1;
  protected System.Web.UI.WebControls.DropDownList DropDownList1;
  protected System.Web.UI.WebControls.Button Btn_Export;
  protected System.Web.UI.WebControls.DropDownList DropDownList2;
  protected System.Web.UI.WebControls.Button btn_Export2;
  ReportDocument reportDoc=new ReportDocument();

  //页面加载
  //SqlConnection myconn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectString"]);
  //SqlConnection myconn1 = new SqlConnection(ConfigurationSettings.AppSettings["ConnectString"]);
  //读取web.config配置文件中的数据库连接字符串,并连接到指定的数据库
  
  private void Page_Load(object sender, System.EventArgs e)
  {
   // Put user code to initialize the page here
   if (!Page.IsPostBack)
   {
    //测试的时候用绑定 
             reportDataBind();
   }
   
  }

  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: This call is required by the ASP.NET Web Form Designer.
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <summary>
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// </summary>
  private void InitializeComponent()
  {   
   this.btn_Export2.Click += new System.EventHandler(this.btn_Export2_Click);
   this.Load += new System.EventHandler(this.Page_Load);

  }
  #endregion

  //绑定数据源
  private void reportDataBind()
  {
     SqlConnection myConn = new SqlConnection("server = 11.101.10.8; database =eProcessDB; uid = sa; pwd =admin@sa ");
     string sql = "SELECT FUNDS_RPT_HQ.VKBUR, FUNDS_RPT_HQ.VKBUR_NAME, FUNDS_RPT_HQ.FORM_DATE, FUNDS_RPT_HQ.AMT_BEG, FUNDS_RPT_HQ.INGDS, FUNDS_RPT_HQ.INOTH, FUNDS_RPT_HQ.PAYHQ, FUNDS_RPT_HQ.PAYOTH, FUNDS_RPT_HQ.AMT_END, FUNDS_RPT_HQ.TOT_INGDS, FUNDS_RPT_HQ.TOT_PAYHQ, FUNDS_RPT_HQ.FEE_END FROM  FUNDS_RPT_HQ WHERE FUNDS_RPT_HQ.FORM_DATE ='2007-05-09' " ;
     myConn.Open();
           SqlDataAdapter myComm = new SqlDataAdapter(sql, myConn);
           DataSet dset1 = new DataSet();
           myComm.Fill(dset1,"FUNDS_RPT_HQ");
           myConn.Close();
     string ls_rptPathName;
     ls_rptPathName = Server.MapPath(".")+"//Funds_Rpt_HQ.rpt";
     reportDoc.Load(ls_rptPathName);
     reportDoc.SetDataSource(dset1);
     CrystalReportViewer1.ReportSource = reportDoc;
     CrystalReportViewer1.DisplayGroupTree = false; //树视图是可见还是隐藏左边的空白显示的比较多的处理方法
   
  }

  
  private void btn_Export2_Click(object sender, System.EventArgs e)
  {
      reportDataBind();
   
      string contenttype = "";
      string ls_FileType;
      ls_FileType = DropDownList2.SelectedValue;

               string ExportPath;
               string Fname;
               ExportPath = Request.PhysicalApplicationPath + "Exported/";
               if ( !Directory.Exists(ExportPath))
               {
               System.IO.Directory.CreateDirectory(Request.PhysicalApplicationPath + "Exported/");
                }

               Fname = "Funds_rpt_HQ";

               CrystalDecisions.Shared.DiskFileDestinationOptions opts = new CrystalDecisions.Shared.DiskFileDestinationOptions();
              //导出为磁盘文件
              CrystalDecisions.Shared.ExportOptions myExportOptions = reportDoc.ExportOptions;
              myExportOptions.DestinationOptions = opts;
              myExportOptions.ExportDestinationType = CrystalDecisions.Shared.ExportDestinationType.DiskFile;

      switch(DropDownList2.SelectedItem.Value)
      {
       case "PDF":
        contenttype = "application/pdf";
        myExportOptions.ExportFormatType = CrystalDecisions.Shared.ExportFormatType.PortableDocFormat;
        break;
      
       case "DOC":
        Response.ContentType = "application/ms-excel";
        myExportOptions.ExportFormatType = CrystalDecisions.Shared.ExportFormatType.WordForWindows;
        break;
      
       case "XLS":
        contenttype = "application/vnd.ms-excel";
        this.EnableViewState = false;
        myExportOptions.ExportFormatType =CrystalDecisions.Shared.ExportFormatType.Excel;
        break;
      }
              
              Fname = Fname +"." + DropDownList2.SelectedItem.Value;
              opts.DiskFileName = ExportPath + Fname ;
               //导出操作
              reportDoc.Export();
              CommonCode.JavaShowWindow("导出文件成功!");

  }

 }
}