（转）Dinktopdf在.net core项目里将Html转成PDF（支持liunx）
Dinktopdf : .Net Core对 wkhtmltopdf 库的封装， 使用Webkit引擎将html转换成pdf.
源码地址： https://github.com/rdvojmoc/DinkToPdf
使用比较简单，直接把github里的示例代码放到你的.net core项目里。
注意：要记得把libwkhtmltox库放到项目的根目录里，并在visual studio里设置“如果较新则复制“
dll是window, so是linux, dylib应该是mac os
如果从github下载慢，你也可以从码云网站下载
https://gitee.com/ofri/DinkToPdf
注： linux或docker容器需要安装 libgdiplus 否则会提示找不到libwkhtmltox
apt-get update
apt-get install libgdiplus
在Startup.cs中添加：
services.AddSingleton(typeof(IConverter), new SynchronizedConverter(new PdfTools()));//DinkToPdf注入
创建IPDFService
using System;
namespace HtmlToPdf.Services
{
/// <summary>
/// 与pdf相关
/// </summary>
public interface IPDFService
{
/// <summary>
/// 创建PDF
/// </summary>
/// <param name="htmlContent">传入html字符串</param>
/// <returns></returns>
byte[] CreatePDF(string htmlContent);
}
}
创建PDFService
using System;
using DinkToPdf;
using DinkToPdf.Contracts;
namespace HtmlToPdf.Services
{
/// <summary>
/// 与pdf相关
/// </summary>
public class PDFService : IPDFService
{
private IConverter _converter;
public PDFService(IConverter converter)
{
_converter = converter;
}
/// <summary>
/// 创建PDF
/// </summary>
/// <param name="htmlContent">传入html字符串</param>
/// <returns></returns>
public byte[] CreatePDF(string htmlContent)
{
var globalSettings = new GlobalSettings
{
ColorMode = ColorMode.Color,
Orientation = Orientation.Portrait,
PaperSize = PaperKind.A4,
//Margins = new MarginSettings
//{
// Top = 10,
// Left = 0,
// Right = 0,
//},
DocumentTitle = "PDF Report",
};
var objectSettings = new ObjectSettings
{
PagesCount = true,
HtmlContent = htmlContent,
// Page = "www.baidu.com", //USE THIS PROPERTY TO GENERATE PDF CONTENT FROM AN HTML PAGE 这里是用现有的网页生成PDF
//WebSettings = { DefaultEncoding = "utf-8", UserStyleSheet = Path.Combine(Directory.GetCurrentDirectory(), "assets", "styles.css") },
WebSettings = { DefaultEncoding = "utf-8" },
//HeaderSettings = { FontName = "Arial", FontSize = 9, Right = "Page [page] of [toPage]", Line = true },
//FooterSettings = { FontName = "Arial", FontSize = 9, Line = true, Center = "Report Footer" }
};
var pdf = new HtmlToPdfDocument()
{
GlobalSettings = globalSettings,
Objects = { objectSettings }
};
var file = _converter.Convert(pdf);
//return File(file, "application/pdf");
return file;
}
}
}
在Startup.cs中依赖注入：
services.AddTransient<IPDFService, PDFService>();
创建TemplateGenerator，生成html字符串
using System;
using System.Text;
namespace HtmlToPdf
{
public static class TemplateGenerator
{
/// <summary>
/// 获取HTML字符串
/// </summary>
/// <returns></returns>
public static string GetPDFHTMLString()
{
StringBuilder sb = new StringBuilder();
sb.Append(@"
<html>
<head>
<meta http-equiv='Content-Type' content='text/html; charset=utf-8' />
<style>
</style>
</head>
<body>
<div>
这是一个网页！
</div>
</body>
</html>
");
return sb.ToString();
}
}
}
修改ValuesController
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using HtmlToPdf.Services;
using Microsoft.AspNetCore.Mvc;
namespace HtmlToPdf.Controllers
{
[Route("api/[controller]")]
[ApiController]
public class ValuesController : ControllerBase
{
private IPDFService _PDFService;
public ValuesController(IPDFService pDFService)
{
_PDFService = pDFService;
}
[HttpGet("pdf")]
public FileResult GetPDF()
{
//获取html模板
var htmlContent = TemplateGenerator.GetPDFHTMLString();
//生成PDF
var pdfBytes = _PDFService.CreatePDF(htmlContent);
return File(pdfBytes, "application/pdf");
}
}
}
测试：
浏览器输入 https://localhost:5001/api/values/pdf
遇到的问题
1.不能发布到linux
这个版本可以在liunx使用，net core 3.1 可以。
2.生成1次pdf，第2次cpu100%
Synchronized converter
Use this converter in multi threaded applications and web servers. Conversion tasks are saved to blocking collection and executed on a single thread.
var converter = new SynchronizedConverter(new PdfTools());
因为注入的方式错了。IConverter converter 已经注入为单例了，
services.AddSingleton(typeof(IConverter), new SynchronizedConverter(new PdfTools()));//DinkToPdf注入
所以直接在service注入使用。
————————————————
ASP.NET Core html生成pdf
作者：GongZH丶
链接：https://www.jianshu.com/p/81ff83d18534
————————————————
如何使用Dinktopdf在.net core项目里将Html转成PDF
作者：omage
链接：https://blog.csdn.net/omage/article/details/114011447
