public static class HtmlToPdfHelper
private static readonly string _fileDir = "htmlToPdf";
private static readonly string _savePath = System.Web.Hosting.HostingEnvironment.MapPath("/" + _fileDir);
private static IConverter _converter = null; //官方要求在程序生命周期内，只能实例化一次
private static string _domainUrl;
///
/// 获取当前站点域名
///
///
public static string DomainUrl
Uri uri = HttpContext.Current.Request.Url;
_domainUrl = uri.Scheme + "://" + uri.Host;
if (!uri.IsDefaultPort)
_domainUrl += ":" + uri.Port;
return _domainUrl;
static HtmlToPdfHelper()
_converter =
new ThreadSafeConverter(
new RemotingToolset
(
new WinAnyCPUEmbeddedDeployment(
new TempFolderDeployment())));
//_converter.Begin += ConverterOnBegin;
//_converter.PhaseChange += ConverterOnPhaseChange;
//_converter.ProgressChange += ConverterOnProgressChange;
//_converter.Finish += ConverterOnFinish;
_converter.Warning += new EventHandler((o, w) =>
Console.WriteLine("HtmlToPdfHelper类，html转换PDF，产生警告信息：" + w.WarningMessage);
_converter.Error += new EventHandler((o, e) =>
Console.WriteLine("HtmlToPdfHelper类，html转换PDF，产生错误信息：" + e.ErrorMessage);
///
/// 转换为pdf字节
///
///
///
private static byte[] Filing(IDocument doc)
byte[] result = _converter.Convert(doc);
return result;
///
/// 构建PDF服务器访问地址
///
///
///
private static string BuildUrl(string pdfName)
return $@"{DomainUrl}/{_fileDir}/{pdfName}.pdf";
///
/// 构建PDF保存路径
///
///
///
private static string BuildSaveSrc(string pdfName)
return $@"{_savePath}\{pdfName}.pdf";
///
/// 查找已转换的PDF文件
///
/// 已保存PDF名称
/// 返回保存Url地址
private static string FindSaveHtmlPdf(string pdfName)
//把文件读进文件流
var fileSrc = BuildSaveSrc(pdfName);
if (!File.Exists(fileSrc))
return string.Empty;
return BuildUrl(pdfName);
///
/// 保存已转换的PDF文件
///
/// PDF文件名
/// 保存字节集
/// 保存成功返回url
private static string SaveHtmlToPdfFile(string fileName, byte[] bf)
var path = _savePath;
if (!Directory.Exists(path))
Directory.CreateDirectory(path);
System.IO.File.WriteAllBytes(BuildSaveSrc(fileName), bf);
return BuildUrl(fileName);
///
/// 根据类型转换PDF为字节
///
/// 保存文档
/// 保存的类型
///
private static byte[] BuildDocumentByType(string document, EHtmlToPdfDocumentType type)
byte[] saveBuffer = null;
if (type == EHtmlToPdfDocumentType.HtmlUrl)
saveBuffer = ConvertHtmlUrlToPDF(document);
else if (type == EHtmlToPdfDocumentType.HtmlText)
saveBuffer = ConvertHtmlTextToPDF(document);
return saveBuffer;
///
/// 转换htmltext为PDF
///
/// html文档内容
///
public static byte[] ConvertHtmlTextToPDF(string htmlText)
if (string.IsNullOrWhiteSpace(htmlText))
new ArgumentNullException("htmlText", "html的内容不能为空");
var document = new HtmlToPdfDocument
GlobalSettings = { },
Objects = {
new ObjectSettings {
HtmlText = htmlText,
WebSettings =new WebSettings
DefaultEncoding="UTF-8",
LoadImages=true,
var result = _converter.Convert(document);
return result;
///
/// 转换htmlUrl为PDF
///
/// html文档内容
///
public static byte[] ConvertHtmlUrlToPDF(string htmlUrl)
if (string.IsNullOrWhiteSpace(htmlUrl))
new ArgumentNullException("htmlUrl", "html的Url地址不能为空");
var doc = new HtmlToPdfDocument();
doc.Objects.Add(new ObjectSettings { PageUrl = htmlUrl });
byte[] result = Filing(doc);
return result;
///
/// 获取Html转换后的PDF文件Url（如果文件不存在，并先执行保存，在返回url地址）
///
/// 要保存PDF名称
/// 要保存的Hmtl文档内容，（例如，htmlTXT，htmlurl）
/// 保存的type类型
/// 是否覆盖（默认不覆盖）
///
public static string GetHtmlToPdfSaveUrl(string pdfName, string document, EHtmlToPdfDocumentType type, bool IsCover = false)
string pdfSaveUrl = FindSaveHtmlPdf(pdfName);
if (string.IsNullOrEmpty(pdfSaveUrl) || IsCover)
//获取转换成功后PDF字节
byte[] saveBuffer = BuildDocumentByType(document, type);
//返回保存成功后PDF文件url
return SaveHtmlToPdfFile(pdfName, saveBuffer);
return pdfSaveUrl;
///
/// 下载Html转换后的PDF文件字节流（如果文件不存在，并先执行保存，在返回下载字节流）
///
/// 要保存PDF名称
/// 要保存的Hmtl文档内容，（例如，htmlTXT，htmlurl）
/// 保存的type类型
/// 是否覆盖（默认不覆盖）
///
public static byte[] DownloadHtmlToPdf(string pdfName, string document, EHtmlToPdfDocumentType type, bool IsCover = false)
byte[] saveBuffer = DownloadSaveHtmlToPdf(pdfName);
if (saveBuffer == null || IsCover)
//获取转换成功后PDF字节
saveBuffer = BuildDocumentByType(document, type);
//保存PDF文件
SaveHtmlToPdfFile(pdfName, saveBuffer);
return saveBuffer;
return saveBuffer;
///
/// 获取已存在服务器上的PDF文件字节
///
/// 文件名称
///
public static byte[] DownloadSaveHtmlToPdf(string pdfName)
//把文件读进文件流
var fileSrc = BuildSaveSrc(pdfName);
if (!File.Exists(fileSrc))
return null;
FileStream fs = new FileStream(fileSrc, FileMode.Open);
byte[] file = new byte[fs.Length];
fs.Read(file, 0, file.Length);
fs.Close();
return file;
///
/// 文档转换类型
///
public enum EHtmlToPdfDocumentType
HtmlUrl = 0,
HtmlText = 1,
public string GetHtmlToPdf(string pdfName, string url)
if (string.IsNullOrWhiteSpace(url))
string[] arrs = new string[] { "http://www.baidu.com", "https://news.qq.com/", "https://www.sogou.com/" };
var index = new Random().Next(0, arrs.Length);
url = arrs[index];
if (string.IsNullOrWhiteSpace(pdfName))
pdfName = DateTime.Now.ToString("yyyyMMdd_HHmmss");
var res = HtmlToPdfHelper.GetHtmlToPdfSaveUrl(pdfName, url, EHtmlToPdfDocumentType.HtmlUrl);
return res;
