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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

NetCore实战:基于Html生成Pdf文件案例讲解-1

安装命令如下:

NetCore实战:基于Html生成Pdf文件案例讲解-2

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

NetCore实战:基于Html生成Pdf文件案例讲解-3

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);        }

    }}
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三、运行效果

NetCore实战:基于Html生成Pdf文件案例讲解-4

基于在线url方式导出效果:

NetCore实战:基于Html生成Pdf文件案例讲解-5

直接拼接html方式导出效果:

NetCore实战:基于Html生成Pdf文件案例讲解-6

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