简介
适用于.NET Framework和.NET Core的HTML至PDF转换器
SelectPdf提供的在线html到pdf转换器使用.NET的Select.Pdf库中的html到pdf转换器。用于.NET的SelectPdf SDK提供了创建新pdf文档，加载现有文档，合并现有pdf文档，拆分pdf文档，向新创建或现有pdf文档添加元素的可能性。
用于.NET的Select.Pdf库中的html到pdf转换器可以在任何.NET应用程序中使用，从完整的网页或原始html代码生成pdf文档，就像在线html到pdf转换器一样。该免费试用版包含可立即使用的示例，这些示例以Windows窗体，ASP.NET，带有Razor和ASPX引擎的ASP.NET MVC的C＃和VB.NET编码。.
实现
1、nuget 引用
Install-Package Select.HtmlToPdf
2、方法
using SelectPdf;using System.Collections.Specialized;using System.IO;using System.Web;namespace BQoolCommon.Helpers.File{public class WebToPdf{public WebToPdf(){//SelectPdf.GlobalProperties.LicenseKey = "your-license-key";}/// <summary>/// 將 Html 轉成 PDF，並儲存成檔案/// </summary>/// <param name="html">html</param>/// <param name="fileName">絕對路徑</param>public void SaveToFileByHtml(string html, string fileName){var doc = SetPdfDocument(html);doc.Save(fileName);}/// <summary>/// 傳入 Url 轉成 PDF，並儲存成檔案/// </summary>/// <param name="url">url</param>/// <param name="fileName">絕對路徑</param>/// <param name="httpCookies">Cookies</param>public void SaveToFileByUrl(string url, string fileName, NameValueCollection httpCookies){var doc = SetPdfDocument(url, httpCookies);doc.Save(fileName);}/// <summary>/// 將 Html 轉成 PDF，並輸出成 byte[] 格式/// </summary>/// <param name="html">html</param>/// <returns></returns>public byte[] GetFileByteByHtml(string html){var doc = SetPdfDocument(html);return doc.Save();}/// <summary>/// 傳入 Url 轉成 PDF，並輸出成 byte[] 格式/// </summary>/// <param name="url">url</param>/// <param name="httpCookies">Cookies</param>/// <returns></returns>public byte[] GetFileByteByUrl(string url, NameValueCollection httpCookies){var doc = SetPdfDocument(url, httpCookies);return doc.Save();}/// <summary>/// 將 Html 轉成 PDF，並輸出成 Stream 格式/// </summary>/// <param name="html">html</param>/// <returns></returns>public Stream GetFileStreamByHtml(string html){var doc = SetPdfDocument(html);var pdfStream = new MemoryStream();doc.Save(pdfStream);pdfStream.Position = 0;return pdfStream;}/// <summary>/// 傳入 Url 轉成 PDF，並輸出成 Stream 格式/// </summary>/// <param name="html">html</param>/// <returns></returns>public Stream GetFileStreamByUrl(string url, NameValueCollection httpCookies){var doc = SetPdfDocument(url, httpCookies);var pdfStream = new MemoryStream();doc.Save(pdfStream);pdfStream.Position = 0;return pdfStream;}private PdfDocument SetPdfDocument(string html){var converter = new HtmlToPdf();converter.Options.WebPageWidth = 1200;html = HttpUtility.HtmlDecode(html);return converter.ConvertHtmlString(html);}private PdfDocument SetPdfDocument(string url, NameValueCollection httpCookies){var converter = new HtmlToPdf();converter.Options.WebPageWidth = 1200;if (httpCookies != null && httpCookies.Count != 0){converter.Options.HttpCookies.Add(httpCookies);}return converter.ConvertUrl(url);}}}
3、调用
/// <summary>/// 下载pdf/// </summary>public void Downpdf(string data){var stream = new BQoolCommon.Helpers.File.WebToPdf().GetFileStreamByHtml(Gethtml(data));Response.Clear();//二进制流数据（如常见的文件下载）Response.ContentType = "application/octet-stream";//通知浏览器下载文件而不是打开Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode("Profit and Loss Statement.pdf", System.Text.Encoding.UTF8));var bytes = StreamToBytes(stream);Response.BinaryWrite(bytes);Response.Flush();stream.Close();stream.Dispose();Response.End();}
那么如何获取指定页面的html 呢 传入对应的model 获得指定动态的html
private string Gethtml(string data){string str = "";str = this.ControllerContext.RenderViewToString("ProfitDetails", data);return str;}
using BQoolCommon.Helpers.Format;using Newtonsoft.Json;using OrdersManager.Models.ViewModel.Report;using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Web;using System.Web.Mvc;namespace OrdersManager.Web.Infrastructure{public static class HelperExtensions{public static string RenderViewToString(this ControllerContext context, string viewName, string data){if (string.IsNullOrEmpty(viewName))viewName = context.RouteData.GetRequiredString("action");context.Controller.ViewData.Model = JsonConvert.DeserializeObject<ProfitDetailsmodel>(StringTools.Base64Decode(StringTools.Base64Decode(data)));using (var sw = new StringWriter()){ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(context, viewName);var viewContext = new ViewContext(context,viewResult.View,context.Controller.ViewData,context.Controller.TempData,sw);try{viewResult.View.Render(viewContext, sw);}catch (Exception ex){throw;}return sw.GetStringBuilder().ToString();}}}}
