#頭條創作挑戰賽#
一、WkHtmlToPdfDotNet介紹
WkHtmlToPdfDotNet是基于本地 wkhtmltopdf封裝的.NET Core類庫，主要通過webkit引擎實作html頁面轉換為pdf檔案。并且支援在Windows、Docker、Linux、MacOSX運作。
主要功能實作線上URL轉pdf檔案或者html代碼直接轉換為pdf檔案，并對css樣式、圖檔等很好的支援，導出的pdf檔案和網站相差不大。
今天給大家通過實際的案例給大家介紹一下如何使用它，感興趣的朋友可以一起來學習一下！
官網：https://github.com/HakanL/WkHtmlToPdf-DotNet
二、安裝
1、使用Visual Studio 2019及以上版本建立一個.NET Core控制台程式。
2、安裝WkHtmlToPdfDotNet依賴包
指令方式安裝
工具→NuGet包管理器→程式包管理器控制包
安裝指令如下：
Install-Package Haukcode.WkHtmlToPdfDotNet 直接通過Nuget包搜尋安裝
工具→NuGet包管理器→管了解決方案的NuGet程式包
3、實作代碼
using System;
using System.IO;
using WkHtmlToPdfDotNet;
namespace HtmlToPdf
{
class Program
{
// https://github.com/HakanL/WkHtmlToPdf-DotNet
// 安裝依賴包 Install-Package Haukcode.WkHtmlToPdfDotNet
static void Main(string[] args)
{
//ConvertHtmlToPdf();
ConvertUrlToPdf();
}
/// <summary>
/// 基于html導出pdf
/// </summary>
private static void ConvertHtmlToPdf()
{
var converter = new BasicConverter(new PdfTools());
// 綁定轉換過程中處理事件日志
converter.PhaseChanged += Converter_PhaseChanged;
converter.ProgressChanged += Converter_ProgressChanged;
converter.Finished += Converter_Finished;
converter.Warning += Converter_Warning;
converter.Error += Converter_Error;
// pdf 樣式設定
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>測試</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]" }
}
}
};
// 轉換為二進制
byte[] pdf = converter.Convert(doc);
// 判斷目錄是否存在，不存在則建立
if (!Directory.Exists("Files"))
{
Directory.CreateDirectory("Files");
}
// 檔案儲存
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導出pdf
/// </summary>
private static void ConvertUrlToPdf()
{
var converter = new BasicConverter(new PdfTools());
// 綁定轉換過程中處理事件日志
converter.PhaseChanged += Converter_PhaseChanged;
converter.ProgressChanged += Converter_ProgressChanged;
converter.Finished += Converter_Finished;
converter.Warning += Converter_Warning;
converter.Error += Converter_Error;
// pdf 樣式設定
var doc = new HtmlToPdfDocument()
{
GlobalSettings = {
PaperSize = PaperKind.A3, // 紙張類型
Orientation = Orientation.Landscape,
},
// 支援多個網址
Objects = {
new ObjectSettings()
{
Page = "http://baidu.com/",
},
new ObjectSettings()
{
Page = "https://www.163.com/dy/article/HJVSIG920511DTU9.html?clickfrom=w_yw_zgzz",
}
}
};
// 轉換為二進制
byte[] pdf = converter.Convert(doc);
// 判斷目錄是否存在，不存在則建立
if (!Directory.Exists("FilesHtml"))
{
Directory.CreateDirectory("FilesHtml");
}
// 檔案儲存
using (var stream = new FileStream(Path.Combine("FilesHtml", DateTime.UtcNow.Ticks.ToString() + ".pdf"), FileMode.Create))
{
stream.Write(pdf, 0, pdf.Length);
}
}
/// <summary>
/// 轉換産生錯誤日志輸出
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void Converter_Error(object sender, WkHtmlToPdfDotNet.EventDefinitions.ErrorArgs e)
{
Console.WriteLine("[轉換錯誤] {0}", e.Message);
}
/// <summary>
/// 轉換産生警告日志輸出
/// </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>
/// 轉轉完成日志輸出
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void Converter_Finished(object sender, WkHtmlToPdfDotNet.EventDefinitions.FinishedArgs e)
{
Console.WriteLine("轉換 {0} ", e.Success ? "成功" : "失敗");
}
/// <summary>
/// 轉換進度日志輸出
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void Converter_ProgressChanged(object sender, WkHtmlToPdfDotNet.EventDefinitions.ProgressChangedArgs e)
{
Console.WriteLine("轉換進度 {0}", e.Description);
}
/// <summary>
/// 轉換階段日志輸入
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void Converter_PhaseChanged(object sender, WkHtmlToPdfDotNet.EventDefinitions.PhaseChangedArgs e)
{
Console.WriteLine("階段進度 {0} - {1}", e.CurrentPhase, e.Description);
}
}
}
三、運作效果
基于線上url方式導出效果
直接拼接html方式導出效果