html转pdf

直接将html转换成pdf,用过其他的几种方式效果相当的不理想。最后找到wkhtmltopdf转换pdf效果还比较好，以下是解决方案。

第一步：下载wkhtmltopdf，加压并找到wkhtmltopdf.exe文件，可以将wkhtmltopdf.exe文件放到任意位置，建议放到程序的根目录中。

第二步：通过c#进程调用wkhtmltopdf.exe将html转换成pdf文件。以下是转换方法。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.IO;
using System.Diagnostics;
using System.Configuration;

namespace GH.TechnicalSupervision.BLL2
{
    public class PdfHelper
    {
        /// <summary>
        /// HTML转换为PDF
        /// </summary>
        /// <param name="htmlPath">可以是本地路径，也可以是网络地址</param>
        /// <param name="savePath">PDF文件保存的路径</param>
        /// <returns></returns>
        public bool HtmlConvertToPdf(string pdfExePath,string htmlPath, string savePath)
        {
            bool flag = false;
            CheckFilePath(savePath);

            ///这个路径为程序集的目录，因为我把应用程序 wkhtmltopdf.exe 放在了程序集同一个目录下
            //string exePath = AppDomain.CurrentDomain.BaseDirectory.ToString() + "wkhtmltopdf.exe";"";
            //string exePath = "C:\Program Files (x86)\wkhtmltopdf\bin\wkhtmltopdf.exe";
            string exePath = pdfExePath;
            if (!File.Exists(exePath))
            {
                throw new Exception("No application wkhtmltopdf.exe was found.");
            }

            try
            {
                ProcessStartInfo processStartInfo = new ProcessStartInfo();
                processStartInfo.FileName = exePath;
                processStartInfo.WorkingDirectory = Path.GetDirectoryName(exePath);
                processStartInfo.UseShellExecute = false;
                processStartInfo.CreateNoWindow = true;
                processStartInfo.RedirectStandardInput = true;
                processStartInfo.RedirectStandardOutput = true;
                processStartInfo.RedirectStandardError = true;
                processStartInfo.Arguments = GetArguments(htmlPath, savePath);

                Process process = new Process();
                process.StartInfo = processStartInfo;
                process.Start();
                process.WaitForExit();

                ///用于查看是否返回错误信息
                //StreamReader srone = process.StandardError;
                //StreamReader srtwo = process.StandardOutput;
                //string ss1 = srone.ReadToEnd();
                //string ss2 = srtwo.ReadToEnd();
                //srone.Close();
                //srone.Dispose();
                //srtwo.Close();
                //srtwo.Dispose();

                process.Close();
                process.Dispose();

                flag = true;
            }
            catch
            {
                flag = false;
            }
            return flag;
        }

        /// <summary>
        /// 获取命令行参数
        /// </summary>
        /// <param name="htmlPath"></param>
        /// <param name="savePath"></param>
        /// <returns></returns>
        private string GetArguments(string htmlPath, string savePath)
        {
            if (string.IsNullOrEmpty(htmlPath))
            {
                throw new Exception("HTML local path or network address can not be empty.");
            }

            if (string.IsNullOrEmpty(savePath))
            {
                throw new Exception("The path saved by the PDF document can not be empty.");
            }

            StringBuilder stringBuilder = new StringBuilder();
            //stringBuilder.Append(" --page-height 100 ");        //页面高度100mm
            //stringBuilder.Append(" --page-width 100 ");         //页面宽度100mm
            //stringBuilder.Append(" --header-center 我是页眉 ");  //设置居中显示页眉
            //stringBuilder.Append(" --header-line ");         //页眉和内容之间显示一条直线
            //stringBuilder.Append(" --footer-center "Page [page] of [topage]" ");    //设置居中显示页脚
            //stringBuilder.Append(" --footer-line ");       //页脚和内容之间显示一条直线
            stringBuilder.Append(" " + htmlPath + " ");       //本地 HTML 的文件路径或网页 HTML 的URL地址
            stringBuilder.Append(" " + savePath + " ");       //生成的 PDF 文档的保存路径
            return stringBuilder.ToString();
        }

        /// <summary>
        /// 验证保存路径
        /// </summary>
        /// <param name="savePath"></param>
        private void CheckFilePath(string savePath)
        {
            string ext = string.Empty;
            string path = string.Empty;
            string fileName = string.Empty;

            ext = Path.GetExtension(savePath);
            if (string.IsNullOrEmpty(ext) || ext.ToLower() != ".pdf")
            {
                throw new Exception("Extension error:This method is used to generate PDF files.");
            }

            fileName = Path.GetFileName(savePath);
            if (string.IsNullOrEmpty(fileName))
            {
                throw new Exception("File name is empty.");
            }

            try
            {
                path = savePath.Substring(0, savePath.IndexOf(fileName));
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }
            }
            catch
            {
                throw new Exception("The file path does not exist.");
            }
        }
    }
}

　　

注意：转换的网页的字体有可能wkhtmltopdf不识别，导致转换后的pdf文件出现乱码。比如“宋体”不识别，但是“新宋体”能识别。