NET|C#生成PDF文件

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项目需要在线生成PDF文件，我首先考虑采用itextsharp控件来实现。具体方法参考 https://sourceforge.net/projects/itextsharp/

1.首先利用nuget 引入该控件包。

![在这里插入图片描述](https://img-blog.csdnimg.cn/img_convert/2626f9837f6e050e0abfa4fe62dc720c.png#pic_center)

2、然后直接创建就可以了。

using iTextSharp.text;
using iTextSharp.text.pdf;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;public class CreatePDF
{private static CreatePDF instance;public static CreatePDF GetInstance(){if (instance == null){instance = new CreatePDF();}return instance;}private static Document doc;//string fontdb = AppDomain.CurrentDomain.BaseDirectory + "Template\\msyh.ttc";//private static BaseFont bf = BaseFont.CreateFont(@"C://Windows/Fonts/simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);static string fontdb = (AppDomain.CurrentDomain.BaseDirectory + "Template\\msyh.ttf").Replace("\\", "/");private static BaseFont bf = BaseFont.CreateFont(fontdb + "", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);//四种字体private static Font fontBig = new Font(bf, 14, Font.BOLD);private static Font fontSmall = new Font(bf, (float)10.5, Font.BOLD);private static Font fontSmallNoBold = new Font(bf, (float)10.5);private static float IndentationLeft = 50;//距左边距//如果要传参数进来，可自定义public string GeneratePDF(string name){doc = new Document(PageSize.A4);string filePath = string.Empty;try{//MemoryStream ms2 = new MemoryStream();string fileName = string.Format("{0}.pdf", DateTime.Now.ToString("yyyyMMddHHmmss"));filePath = AppDomain.CurrentDomain.BaseDirectory + "Template\\" + fileName;FileStream fs = new FileStream(filePath, FileMode.Create);//创建临时文件，到时生成好后删除PdfWriter writer = PdfWriter.GetInstance(doc, fs);writer.CloseStream = false;//把doc内容写入流中doc.Open();//核心操作CreateLine(name);//生成一条下横线#region 添加水印string waterMarkName = "机密";#endregiondoc.Close();MemoryStream ms = new MemoryStream();if (fs != null){byte[] bytes = new byte[fs.Length];//定义一个长度为fs长度的字节数组fs.Read(bytes, 0, (int)fs.Length);//把fs的内容读到字节数组中ms.Write(bytes, 0, bytes.Length);//把字节内容读到流中fs.Flush();fs.Close();}MemoryStream waterMS = SetWaterMark(ms, filePath, waterMarkName);//先生成水印，再删除临时文件//if (File.Exists(filePath))//判断临时文件是否存在，如果存在则删除//{//    File.Delete(filePath);//    GC.Collect();//回收垃圾//}//SendFile(fileName, waterMS);//把PDF文件发送回浏览器}catch (DocumentException ex){throw new Exception(ex.Message);}return filePath;}#region 生成一条横线private static void CreateLine(string name){PdfPTable table = new PdfPTable(1);//一个单元格的PdfPCell cell = new PdfPCell();Image gif = Image.GetInstance(AppDomain.CurrentDomain.BaseDirectory + "Template\\logo.png");gif.ScaleAbsoluteWidth(100);cell.AddElement(gif);cell.BorderWidth = 0f;cell.BorderWidthBottom = 0.2f;table.AddCell(cell);doc.Add(table);}#endregion#region 生成页码private static void AddPageNumberContent(){var content = new Paragraph("共   页  第   页", fontSmall);content.IndentationRight = IndentationLeft + 20;content.Alignment = 2;    //居左doc.Add(content);}#endregion#region 生成单元格private static PdfPCell GetPdfCell(string content, Font font, int horizontalAlignment){Paragraph paragraph = new Paragraph(content, font);paragraph.FirstLineIndent = 2;paragraph.SetLeading(10, 20);paragraph.SpacingAfter = 10;PdfPCell cell = new PdfPCell(paragraph);cell.HorizontalAlignment = horizontalAlignment;//水平位置cell.VerticalAlignment = Element.ALIGN_CENTER;//垂直居中cell.MinimumHeight = 20;//单元格的最小高度cell.Border = 0;return cell;}#endregion#region 生成水印private static MemoryStream SetWaterMark(MemoryStream ms, string filePath, string waterMarkName, string waterMarkAddr = null){MemoryStream msWater = new MemoryStream();PdfReader pdfReader = null;PdfStamper pdfStamper = null;try{pdfReader = new PdfReader(filePath);pdfStamper = new PdfStamper(pdfReader, msWater);int total = pdfReader.NumberOfPages + 1;//获取PDF的总页数iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(1);//获取第一页float width = psize.Width;//PDF页面的宽度，用于计算水印倾斜float height = psize.Height;PdfContentByte waterContent;BaseFont basefont = BaseFont.CreateFont(@"C:\WINDOWS\Fonts\SIMFANG.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);PdfGState gs = new PdfGState();for (int i = 1; i < total; i++){waterContent = pdfStamper.GetOverContent(i);//在内容上方加水印//透明度waterContent.SetGState(gs);//开始写入文本waterContent.BeginText();waterContent.SetColorFill(BaseColor.RED);waterContent.SetFontAndSize(basefont, 18);waterContent.SetTextMatrix(0, 0);if (waterMarkAddr == null || waterMarkAddr == ""){waterContent.ShowTextAligned(Element.ALIGN_CENTER, waterMarkName, width / 2, height / 2, 55);}else{waterContent.ShowTextAligned(Element.ALIGN_CENTER, waterMarkName, width / 2, height / 2 + 100, 55);waterContent.ShowTextAligned(Element.ALIGN_CENTER, waterMarkAddr, width / 2, height / 2 - 100, 55);}waterContent.EndText();}}catch (Exception){return ms;}finally{if (pdfStamper != null)pdfStamper.Close();if (pdfReader != null)pdfReader.Close();}return msWater;}#endregion//-----------------------发送PDF文件回浏览器端----------------------public static void SendFile(string fileName, MemoryStream ms, Encoding encoding = null){fileName = (fileName + "").Replace(" ", "");encoding = encoding ?? Encoding.UTF8;if (ms != null && !string.IsNullOrEmpty(fileName)){System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;response.Clear();response.Charset = encoding.BodyName;// "utf-8";if (!HttpContext.Current.Request.UserAgent.Contains("Firefox") && !HttpContext.Current.Request.UserAgent.Contains("Chrome")){fileName = HttpUtility.UrlEncode(fileName, encoding);}response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);//为了解决打开，导出NPOI生成的xlsx文件时，提示发现不可读取内容。if (!(fileName + "").ToLower().EndsWith(".xlsx")){response.AddHeader("Content-Type", "application/octet-stream");response.BinaryWrite(ms.GetBuffer());}else{response.BinaryWrite(ms.ToArray());}ms.Close();ms = null;response.Flush();response.End();}}
}

特别需要注意一点的是，如果对字体有特殊要求，可以将字库文件放在项目目录下，但字库的文件类型不同，引用时略有差别。

ttc文件

BaseFont.CreateFont(@"C://Windows/Fonts/simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

ttf文件

BaseFont.CreateFont(@"C://Windows/Fonts/simsun.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

这种模式的弊端在于调整文档的格式太痛苦了，你想按照预定的模板生成pdf，格式要按照他的机制一点点写，如果是篇幅比较长的文档，耐心和时间缺一不可。

在我埋头写了一天之后，同事路过看到我一脸狰狞，细问之，马上丢给我一个包，十分钟后搞定。没有广告，工具类马上贴上来。

本方法依赖于Aspose.Words，因为版权问题，不要直接用nuget引入，需要去网上down一个破解版。然后将需要生成的文件内容置于一个word中，相应参数用字符标识后，方便替换。最后加入以下工具类直接调用就OK了。

（破解dll可以在这里自取链接: https://pan.baidu.com/s/1o7XpCqI 密码: kwpt）

CrackWord.cs

using System;
using System.Reflection;class CrackWord
{/// <summary>/// 16.10.1.0/// </summary>public static void Crack()//使用前调用一次即可{string[] stModule = new string[8]{"\u000E\u2008\u200A\u2001","\u000F\u2008\u200A\u2001","\u0002\u200A\u200A\u2001","\u000F","\u0006","\u000E","\u0003","\u0002"};Assembly assembly = Assembly.GetAssembly(typeof(Aspose.Words.License));Type typeLic = null, typeIsTrial = null, typeHelper = null;foreach (Type type in assembly.GetTypes()){if ((typeLic == null) && (type.Name == stModule[0])){typeLic = type;}else if ((typeIsTrial == null) && (type.Name == stModule[1])){typeIsTrial = type;}else if ((typeHelper == null) && (type.Name == stModule[2])){typeHelper = type;}}if (typeLic == null || typeIsTrial == null || typeHelper == null){throw new Exception();}object lic = Activator.CreateInstance(typeLic);int findCount = 0;foreach (FieldInfo field in typeLic.GetFields(BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance)){if (field.FieldType == typeLic && field.Name == stModule[3]){field.SetValue(null, lic);++findCount;}else if (field.FieldType == typeof(DateTime) && field.Name == stModule[4]){field.SetValue(lic, DateTime.MaxValue);++findCount;}else if (field.FieldType == typeIsTrial && field.Name == stModule[5]){field.SetValue(lic, 1);++findCount;}}foreach (FieldInfo field in typeHelper.GetFields(BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance)){if (field.FieldType == typeof(bool) && field.Name == stModule[6]){field.SetValue(null, false);++findCount;}if (field.FieldType == typeof(int) && field.Name == stModule[7]){field.SetValue(null, 128);++findCount;}}if (findCount < 5){throw new NotSupportedException("无效的版本");}}
}

ReplaceAndInsertImage.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Aspose.Words;
using Aspose.Words.Replacing;public class ReplaceAndInsertImage : IReplacingCallback
{/// <summary>/// 需要插入的图片路径/// </summary>public string Url { get; set; }public ReplaceAndInsertImage(string url){this.Url = url;}public ReplaceAction Replacing(ReplacingArgs e){//获取当前节点var node = e.MatchNode;//获取当前文档Document doc = node.Document as Document;DocumentBuilder builder = new DocumentBuilder(doc);//将光标移动到指定节点builder.MoveTo(node);//插入图片builder.InsertImage(Url);return ReplaceAction.Replace;}
}

Cv.cs 调用生成类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Aspose.Words;public class Cv
{/// <summary>/// 生成录用offer文档/// </summary>/// <param name="source">模板文件</param>/// <param name="filespath">生成的PDF目录</param>/// <returns></returns>public static void Run(string source, string filespath,){var dic = new Dictionary<string, string>();//替换模板文件的参数dic.Add("{xingming}","参数");CrackWord.Crack();Aspose.Words.Document doc = new Aspose.Words.Document(source);foreach (var key in dic.Keys){
#pragma warning disable 618doc.Range.Replace(key, dic[key], false, false);
#pragma warning restore 618}doc.Save(filespath, SaveFormat.Pdf);}
}

source 为模板文件目录，本例中为word 文件。