C#生成PDF文档

前段时间在网上看到介绍如何用C#生成PDF文档。感觉还不错，自己做了一下，并对其函数进行了一下小小的改造，使其成为我们平时开发中真正能用的函数。掉用也很方便。具体的操作步骤如下：
1：生成PDF类。
该类将提供一个MAIN函数接口，该接口需要提供生成路径以及生成文档的相关内容。
该类主要是通过StreamWriter去写！！但是StreamWriter写的格式是按照PDF来完成的。
类的代码如下：
using System;
using System.IO;
using System.Text;
using System.Collections;
namespace PDFGenerator
{
public class PDFGenerator
{
static float pageWidth = 594.0f;
static float pageDepth = 828.0f;
static float pageMargin = 30.0f;
static float fontSize = 20.0f;
static float leadSize = 10.0f;
private static string str_path="C://wt.pdf";
// static StreamWriter pPDF=new StreamWriter(str_path);
// static StreamWriter pPDF;
static MemoryStream mPDF= new MemoryStream();
static void ConvertToByteAndAddtoStream(string strMsg)
{
Byte[] buffer=null;
buffer=ASCIIEncoding.ASCII.GetBytes(strMsg);
// buffer=ASCIIEncoding.
mPDF.Write(buffer,0,buffer.Length);
// buffer=null;
}
static string xRefFormatting(long xValue)
{
string strMsg =xValue.ToString();
int iLen=strMsg.Length;
if (iLen<10)
{
StringBuilder s=new StringBuilder();
int i=10-iLen;
s.Append('0',i);
strMsg=s.ToString() + strMsg;
}
return strMsg;
}
public int Main(string str_path_p,string str_content)
{
try
{
str_path=str_path_p+".pdf";
StreamWriter pPDF=new StreamWriter(str_path);
ArrayList xRefs=new ArrayList();
//Byte[] buffer=null;
float yPos =0f;
long streamStart=0;
long streamEnd=0;
long streamLen =0;
string strPDFMessage=null;
//PDF文档头信息
strPDFMessage="%PDF-1.1/n";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
strPDFMessage="1 0 obj/n";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage="<< /Length 2 0 R >>/n";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage="stream/n";
ConvertToByteAndAddtoStream(strPDFMessage);
////////PDF文档描述
streamStart=mPDF.Length;
//字体
strPDFMessage="BT/n/F0 " + fontSize +" Tf/n";
ConvertToByteAndAddtoStream(strPDFMessage);
//PDF文档实体高度
yPos = pageDepth - pageMargin;
strPDFMessage=pageMargin + " " + yPos +" Td/n" ;
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage= leadSize+" TL/n" ;
ConvertToByteAndAddtoStream(strPDFMessage);
//实体内容
strPDFMessage= "("+str_content+")Tj/n" ;
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage= "ET/n";
ConvertToByteAndAddtoStream(strPDFMessage);
streamEnd=mPDF.Length;
streamLen=streamEnd-streamStart;
strPDFMessage= "endstream/nendobj/n";
ConvertToByteAndAddtoStream(strPDFMessage);
//PDF文档的版本信息
xRefs.Add(mPDF.Length);
strPDFMessage="2 0 obj/n"+ streamLen + "/nendobj/n";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
strPDFMessage="3 0 obj/n<</Type/Page/Parent 4 0 R/Contents 1 0 R>>/nendobj/n";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
strPDFMessage="4 0 obj/n<</Type /Pages /Count 1/n";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage="/Kids[/n3 0 R/n]/n";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage="/Resources<</ProcSet[/PDF/Text]/Font<</F0 5 0 R>> >>/n";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage="/MediaBox [ 0 0 "+ pageWidth + " " + pageDepth + " ]/n>>/nendobj/n";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
// strPDFMessage="5 0 obj/n<</Type/Font/Subtype/Type1/BaseFont/Courier/Encoding/WinAnsiEncoding>>/nendobj/n";
strPDFMessage="5 0 obj/n<</Type/Font/Subtype/Type1/BaseFont/Courier/Encoding/GB2312>>/nendobj/n";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
strPDFMessage="6 0 obj/n<</Type/Catalog/Pages 4 0 R>>/nendobj/n";
ConvertToByteAndAddtoStream(strPDFMessage);
streamStart=mPDF.Length;
strPDFMessage="xref/n0 7/n0000000000 65535 f /n";
for(int i=0;i<xRefs.Count;i++)
{
strPDFMessage+=xRefFormatting((long) xRefs[i])+" 00000 n /n";
}
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage="trailer/n<</n/Size "+ (xRefs.Count+1)+"/n/Root 6 0 R/n>>/n";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage="startxref/n" + streamStart+"/n%%EOF/n";
ConvertToByteAndAddtoStream(strPDFMessage);
mPDF.WriteTo(pPDF.BaseStream);
mPDF.Close();
pPDF.Close();
return 1;
}
catch
{
return 0;
}
}
}
}

2：代码调用是这样的，不过，必须要有个saveFileDialog控件，这些代码都是本人自己亲手一个个写的，累啊~~`
private void button_save_Click(object sender, System.EventArgs e)
{
this.saveFileDialog1.ShowDialog();
string str_path=this.saveFileDialog1.FileName;
if(str_path.Trim().Length > 0)
{
us_control(false);
MessageBox.Show("制作PDF过程有些漫长，请耐心等待系统提示！");
PDFGenerator.PDFGenerator mypdf=new PDFGenerator.PDFGenerator();
int i=mypdf.Main(str_path,this.richTextBox1.Text);
if(i==1)
{
MessageBox.Show("制作完成！（：");
}
else
{
MessageBox.Show("制作失败！）：");
}
us_control(true);
}
else
{}
}

这样就完成了！！快去看看你的PDF文档吧~`呵呵~~`