#头条创作挑战赛#

一、WkHtmlToPdfDotNet介绍

WkHtmlToPdfDotNet是基于本地 wkhtmltopdf封装的.NET Core类库，主要通过webkit引擎实现html页面转换为pdf文件。并且支持在Windows、Docker、Linux、MacOSX运行。

主要功能实现在线URL转pdf文件或者html代码直接转换为pdf文件，并对css样式、图片等很好的支持，导出的pdf文件和网站相差不大。

今天给大家通过实际的案例给大家介绍一下如何使用它，感兴趣的朋友可以一起来学习一下！

官网：
https://github.com/HakanL/WkHtmlToPdf-DotNet

二、安装

1、使用Visual Studio 2019及以上版本创建一个.NET Core控制台程序。

2、安装WkHtmlToPdfDotNet依赖包

命令方式安装

工具→NuGet包管理器→程序包管理器控制包

安装命令如下：

 Install-Package Haukcode.WkHtmlToPdfDotNet

直接通过Nuget包搜索安装

工具→NuGet包管理器→管理解决方案的NuGet程序包

3、实现代码

using System;

using System.IO;

using WkHtmlToPdfDotNet;

namespace HtmlToPdf

{

    class Program

    {

        // https://github.com/HakanL/WkHtmlToPdf-DotNet

        // 安装依赖包 Install-Package Haukcode.WkHtmlToPdfDotNet




        static void Main(string[] args)

        {

            //ConvertHtmlToPdf();

            ConvertUrlToPdf();

        }

        /// <summary>

        /// 基于html导出pdf

        /// </summary>

        private static void ConvertHtmlToPdf()

        {

            

            var converter = new BasicConverter(new PdfTools());

            // 绑定转换过程中处理事件日志

            converter.PhaseChanged += Converter_PhaseChanged;

            converter.ProgressChanged += Converter_ProgressChanged;

            converter.Finished += Converter_Finished;

            converter.Warning += Converter_Warning;

            converter.Error += Converter_Error;

            // pdf 样式设置

            var doc = new HtmlToPdfDocument()

            {

                GlobalSettings = {

                    ColorMode = ColorMode.Color,

                    Orientation = Orientation.Landscape,

                    PaperSize = PaperKind.A4,

                },

                Objects = {

                    new ObjectSettings() {

                        PagesCount = true,

                        HtmlContent = @" <p style='color:red'>hello</p><h2>测试</h2><img src='https://www.baidu.com/img/pc_675fe66eab33abff35a2669768c43d95.png' alt=''>",

                        WebSettings = { DefaultEncoding = "utf-8" },

                        HeaderSettings = { FontSize = 9, Right = "Page [page] of [toPage]", Line = false },

                        FooterSettings = { FontSize = 9, Right = "Page [page] of [toPage]" }

                    }

                }

            };

            // 转换为二进制

            byte[] pdf = converter.Convert(doc);

            // 判断目录是否存在，不存在则创建

            if (!Directory.Exists("Files"))

            {

                Directory.CreateDirectory("Files");

            }

            // 文件保存

            using (var stream = new FileStream(Path.Combine("Files", DateTime.UtcNow.Ticks.ToString() + ".pdf"), FileMode.Create))

            {

                stream.Write(pdf, 0, pdf.Length);

            }

        }




        /// <summary>

        /// 基于url导出pdf

        /// </summary>

        private static void ConvertUrlToPdf()

        {




            var converter = new BasicConverter(new PdfTools());

            // 绑定转换过程中处理事件日志

            converter.PhaseChanged += Converter_PhaseChanged;

            converter.ProgressChanged += Converter_ProgressChanged;

            converter.Finished += Converter_Finished;

            converter.Warning += Converter_Warning;

            converter.Error += Converter_Error;

            // pdf 样式设置

            var doc = new HtmlToPdfDocument()

            {

                GlobalSettings = {

                    PaperSize = PaperKind.A3, // 纸张类型

                    Orientation = Orientation.Landscape,

                },

                // 支持多个网址

                Objects = {

                    new ObjectSettings()

                    {

                        Page = "http://baidu.com/",

                    },

                     new ObjectSettings()

                    {

                        Page = "https://www.163.com/dy/article/HJVSIG920511DTU9.html?clickfrom=w_yw_zgzz",




                    }

                }

            };




            // 转换为二进制

            byte[] pdf = converter.Convert(doc);

            // 判断目录是否存在，不存在则创建

            if (!Directory.Exists("FilesHtml"))

            {

                Directory.CreateDirectory("FilesHtml");

            }

            // 文件保存

            using (var stream = new FileStream(Path.Combine("FilesHtml", DateTime.UtcNow.Ticks.ToString() + ".pdf"), FileMode.Create))

            {

                stream.Write(pdf, 0, pdf.Length);

            }

        }







        /// <summary>

        /// 转换产生错误日志输出

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private static void Converter_Error(object sender, WkHtmlToPdfDotNet.EventDefinitions.ErrorArgs e)

        {

            Console.WriteLine("[转换错误] {0}", e.Message);

        }

        /// <summary>

        /// 转换产生警告日志输出

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>




        private static void Converter_Warning(object sender, WkHtmlToPdfDotNet.EventDefinitions.WarningArgs e)

        {

            Console.WriteLine("[警告] {0}", e.Message);

        }

        /// <summary>

        /// 转转完成日志输出

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private static void Converter_Finished(object sender, WkHtmlToPdfDotNet.EventDefinitions.FinishedArgs e)

        {

            Console.WriteLine("转换 {0} ", e.Success ? "成功" : "失败");

        }

        /// <summary>

        /// 转换进度日志输出

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private static void Converter_ProgressChanged(object sender, WkHtmlToPdfDotNet.EventDefinitions.ProgressChangedArgs e)

        {

            Console.WriteLine("转换进度 {0}", e.Description);

        }

        /// <summary>

        /// 转换阶段日志输入

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private static void Converter_PhaseChanged(object sender, WkHtmlToPdfDotNet.EventDefinitions.PhaseChangedArgs e)

        {

            Console.WriteLine("阶段进度 {0} - {1}", e.CurrentPhase, e.Description);

        }







    }

}

三、运行效果

基于在线url方式导出效果

直接拼接html方式导出效果