最近做过一个将页面表格导出至PDF的功能，现在将它整理出来，以备不时之需。
PDF模板是用的是.net报表文件(.rdlc)，原理就是将数据填充到报表文件中，利用Microsoft.Reporting.WebForms.LocalReport类的方法，输出PDF字节流，然后，通过定义Response的HTTP标头定义，在浏览器输出PDF文件。
以下是关键部分的代码：
1. 首先，准备一个输出PDF字节流的方法：
using System;
using System.Collections.Generic;
using ATA.Toeic.Models;
using ATA.Toeic.DAL;
using System.IO;
using Microsoft.Reporting.WebForms;
namespace ATA.Toeic.BLL
{
public class AdmissionTicketBLL
{
private RegistrationDAL dal = new RegistrationDAL();
///
/// 『单个导出』
/// 导出包含一张准考证的pdf文件
///
/// 准考证号
/// 报表模板路径
/// pdf文件字节流
public byte[] ExportTicket(string addmissionFormId, string reportPath, out string mimeType)
{
List arrId = new List();
arrId.Add(addmissionFormId);
return ExportTicket(arrId, reportPath, out mimeType);
}
///
/// 『批量导出』
/// 导出多张准考证的pdf文件
///
/// 需要导出的准考证号
/// pdf文件字节流
public byte[] ExportTicket(List arrAddmissionFormId, string reportPath, out string mimeType)
{
LocalReport localReport = new LocalReport();
localReport.ReportPath = reportPath;
// 报表对象的模板文件的路径
// 报表对象的数据源
ReportDataSource reportDataSource = new ReportDataSource("dsList", GetAdmissionTicketList(arrAddmissionFormId.ToArray())
// 这个方法返回一个IList对象 );
localReport.DataSources.Add(reportDataSource);
string reportType = "PDF";
string encoding;
string fileNameExtension;
//The DeviceInfo settings should be changed based on the reportType
//http://msdn2.microsoft.com/en-us/library/ms155397.aspx
string deviceInfo = "PDF"; Warning[] warnings; string[] streams; byte[] renderedBytes; //Render the report
renderedBytes = localReport.Render( reportType, deviceInfo, out mimeType, out encoding, out fileNameExtension, out streams, out warnings);
return renderedBytes;
}
}
}
2. 在action中定义HTTP标头，输出PDF文件，在这里批量和单个已经没有区别了，区别包含在byte[]的字节流中。
[CheckServiceExpire]
public ActionResult GetAdmissionForms(int serviceid, string Condition)
{
List list = new RegistrationBLL().GetExamineeByCondi(serviceid, Condition);
if (list == null || list.Count == 0)
return Alert("目前没有准考证信息！", "~/Views/ExamService/SaveSuccess.aspx", new { action = "GetExamineeByPage", controller = "Registration", serviceid = serviceid });
List sl = new List();
foreach (RegistrationEn ren in list)
sl.Add(ren.fAdmissionFormId);
try
{
AdmissionTicketBLL bll = new AdmissionTicketBLL();
string rdlcPath = Server.MapPath("~/Resources/AdmissionTicket.rdlc");
string mimeType;
byte[] renderedBytes = bll.ExportTicket(sl, rdlcPath, out mimeType);
Response.AddHeader("content-disposition", "attachment; filename=AdmissionTicket.pdf");
return File(renderedBytes, mimeType);
} catch {
return Alert("获取准考证信息出错！", "~/Views/ExamService/SaveSuccess.aspx", new { action = "GetExamineeByPage", controller = "Registration", serviceid = serviceid });
}
}
这样就可以正常导出PDF文件了。
补充：
如果想在页面中直接打开PDF（要求机器已安装adobe reader），则只需要修改HTTP标头的参数：
将“Response.AddHeader("content-disposition", "attachment; filename=AdmissionTicket.pdf");”替换成“Response.AddHeader("content-disposition", string.Format("inline;filename={0}.pdf", admissionFormId));”
