C#使用itextsharp生成PDF文件的实现代码

项目需求需要生成一个pdf文档，使用的是vs2010，asp.net。
网络上多次搜索没有自己想要的，于是硬着头皮到itextpdf官网看英文文档，按时完成任务，以实用为主，共享一下：
使用html文件创建pdf模板：
使用自定义字体的一种方法：

                fontfactory.register(system.web.httpcontext.current.request.physicalapplicationpath + "\\fonts\\rage.ttf", "myfont");
                font myfont = fontfactory.getfont("myfont");
                basefont bf = myfont.basefont;

其中rage.ttf是微软操作系统自带的字体，目录在c:\windows\fonts，建议将需要的字体拷贝到项目中使用，否则会出现引用不到的情况。
使用自定义样式：

                stylesheet css = new stylesheet();
                dictionary<string, string> dict= new dictionary<string, string>();
                dict.add(htmltags.bgcolor, "#01366c");
                dict.add(htmltags.color, "#000000");
                dict.add(htmltags.size,"25");
                css.loadstyle("css1", dict);

这里既可以使用了stylesheet的loadstyle方法。
注意itextsharp对html元素的支持很弱，像label、div等元素的对齐、背景颜色等属性支持不好，建议使用table标签。
重写font的getfont方法：

public  class myfontfactory : ifontprovider
        {
            public  font getfont(string fontname,string encoding, boolean embedded, float size,int style, basecolor color)
            {
                if (fontname == "微软雅黑")
                {
                    string fontpath = system.web.httpcontext.current.request.physicalapplicationpath + "\\fonts\\msyh.ttf";
                    basefont bf3 = basefont.createfont(fontpath, basefont.identity_h, basefont.embedded);
                    font fontcontent = new font(bf3,size,style,color);
                    return fontcontent;
                }
                else {
                    font fontcontent = fontfactory.getfont(fontname, size, style, color);
                    return fontcontent;
                }
            }
            public  boolean isregistered(string fontname)
            {
                return false;
            }
        }

这里要想使用自定义字体需要继承ifontprovider接口，并重写font的getfont方法。
将自定义字体和样式表加入到文档：

                dictionary<string, object> font = new dictionary<string, object>();
                font.add(htmlworker.font_provider,new myfontfactory());

                list<ielement> p = htmlworker.parsetolist(new streamreader(html), css,font);

使用pdfcontentbyte为元素加背景颜色：

                pdfcontentbyte pcb = writer.directcontentunder;
                pcb.setrgbcolorfill(0, 255, 0);
                pcb.setrgbcolorfill(1, 54, 108);
                pcb.rectangle(20, 413, 800, 42);
                pcb.fill();

缺点显而易见，就是需要绝对坐标，小弟学疏才浅，再加时间紧迫，只能如此。如果大牛知道更好的方法，还望不吝赐教。
完整代码：

using system;
using system.collections.generic;
using system.linq;
using system.web;
using itextsharp.text.pdf;
using itextsharp.text;
using system.io;
using itextsharp.text.html.simpleparser;
using itextsharp.text.html;
/// <summary>
///createpdf 的摘要说明
/// </summary>
namespace wse.lcpi
{
    public class createpdf
    {
        public createpdf()
        {
            //
            //todo: 在此处添加构造函数逻辑
            //
        }
       public  class myfontfactory : ifontprovider
        {
            public  font getfont(string fontname,string encoding, boolean embedded, float size,int style, basecolor color)
            {
                if (fontname == "微软雅黑")
                {
                    string fontpath = system.web.httpcontext.current.request.physicalapplicationpath + "\\lcpi\\fonts\\msyh.ttf";
                    basefont bf3 = basefont.createfont(fontpath, basefont.identity_h, basefont.embedded);
                    font fontcontent = new font(bf3,size,style,color);
                    return fontcontent;
                }
                else {
                    font fontcontent = fontfactory.getfont(fontname, size, style, color);
                    return fontcontent;
                }
            }
            public  boolean isregistered(string fontname)
            {
                return false;
            }
        }
        /// <summary>
        /// 生成pdf
        /// </summary>
        /// <param name="html"></param>
        /// <param name="filename"></param>
        /// <returns></returns>
        public static boolean htmltopdf(string html, string filename)
        {
            boolean isok = false;
            try
            {
                textreader reader = new stringreader(html);
                // step 1: creation of a document-object
                document document = new document(pagesize.a4.rotate(), 30, 30, 30, 30);
                // step 2:
                // we create a writer that listens to the document
                // and directs a xml-stream to a file
                filename = system.web.httpcontext.current.request.physicalapplicationpath + "\\pdf\\" + filename+".pdf";
              filestream fs=new filestream(filename, filemode.create,fileaccess.write,fileshare.readwrite);
                pdfwriter writer = pdfwriter.getinstance(document,fs );
                htmlworker worker = new htmlworker(document);
                document.open();
                worker.startdocument();
                stylesheet css = new stylesheet();
                dictionary<string, object> font = new dictionary<string, object>();
                font.add(htmlworker.font_provider,new myfontfactory());
                dictionary<string, string> dict= new dictionary<string, string>();
                dict.add(htmltags.bgcolor, "#01366c");
                dict.add(htmltags.color, "#000000");
                dict.add(htmltags.size,"25");
                css.loadstyle("css", dict);

                list<ielement> p = htmlworker.parsetolist(new streamreader(html), css,font);
                for (int k = 0; k < p.count; k++)
                {
                    document.add((ielement)p[k]);
                }
                pdfcontentbyte pcb = writer.directcontentunder;
                pcb.setrgbcolorfill(0, 255, 0);
                pcb.setrgbcolorfill(1, 54, 108);
                pcb.rectangle(20, 413, 800, 42);
                pcb.fill();
                worker.enddocument();
                worker.close();              
                document.close();
                reader.close();
                isok = true;
            }
            catch (exception ex)
            {
                isok = false;
            }
            finally {

            }
            return isok;
        }
    }
}