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PdfExporter.cs
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PdfExporter.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using System.Reflection;
using WkHtmlToPdfDotNet;
using Magicodes.ExporterAndImporter.Core;
using Magicodes.ExporterAndImporter.Core.Extension;
using Magicodes.ExporterAndImporter.Core.Models;
using Magicodes.ExporterAndImporter.Html;
using System.Text;
using System.Runtime.InteropServices;
using Magicodes.IE.Core;
namespace Magicodes.ExporterAndImporter.Pdf
{
/// <summary>
/// Pdf导出逻辑
/// </summary>
public class PdfExporter : IPdfExporter
{
private readonly Lazy<HtmlExporter> _htmlExporter;
private HtmlExporter HtmlExporter => _htmlExporter.Value;
private static readonly SynchronizedConverter PdfConverter = new SynchronizedConverter(new PdfTools());
public PdfExporter()
{
//var context = new CustomAssemblyLoadContext();
// Check the platform and load the appropriate Library
//if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
//{
// var appPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
// var wkHtmlToPdfPath = Path.Combine(appPath, "runtimes", "linux-x64", "native", "wkhtmltox.so");
// if (!File.Exists(wkHtmlToPdfPath))
// {
// wkHtmlToPdfPath = Path.Combine(appPath, "wkhtmltox.so");
// }
// context.LoadUnmanagedLibrary(wkHtmlToPdfPath);
//}
_htmlExporter = new Lazy<HtmlExporter>();
}
/// <summary>
/// 根据模板导出列表
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="fileName"></param>
/// <param name="dataItems"></param>
/// <param name="htmlTemplate"></param>
/// <returns></returns>
public async Task<ExportFileInfo> ExportListByTemplate<T>(string fileName, ICollection<T> dataItems,
string htmlTemplate = null) where T : class
{
if (string.IsNullOrWhiteSpace(fileName)) throw new ArgumentException(Resource.FileNameMustBeFilled, nameof(fileName));
var exporterAttribute = GetExporterAttribute<T>();
var htmlString = await HtmlExporter.ExportListByTemplate(dataItems, htmlTemplate);
if (exporterAttribute.IsWriteHtml)
File.WriteAllText(fileName + ".html", htmlString);
return await ExportPdf(fileName, exporterAttribute, htmlString);
}
/// <summary>
/// 根据模板导出
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="fileName"></param>
/// <param name="data"></param>
/// <param name="htmlTemplate"></param>
/// <returns></returns>
public async Task<ExportFileInfo> ExportByTemplate<T>(string fileName, T data, string htmlTemplate)
where T : class
{
if (string.IsNullOrWhiteSpace(fileName)) throw new ArgumentException(Resource.FileNameMustBeFilled, nameof(fileName));
var exporterAttribute = GetExporterAttribute<T>();
var htmlString = await HtmlExporter.ExportByTemplate(data, htmlTemplate);
if (exporterAttribute.IsWriteHtml)
File.WriteAllText(fileName + ".html", htmlString);
return await ExportPdf(fileName, exporterAttribute, htmlString);
}
/// <summary>
/// 获取文档转换配置
/// </summary>
/// <param name="fileName"></param>
/// <param name="pdfExporterAttribute"></param>
/// <param name="htmlString"></param>
/// <returns></returns>
private async Task<ExportFileInfo> ExportPdf(string fileName,
PdfExporterAttribute pdfExporterAttribute,
string htmlString)
{
var result = await ExportPdf(pdfExporterAttribute, htmlString);
#if NETSTANDARD2_1
await File.WriteAllBytesAsync(fileName, result);
#else
File.WriteAllBytes(fileName, result);
#endif
var fileInfo = new ExportFileInfo(fileName, "application/pdf");
return await Task.FromResult(fileInfo);
}
/// <summary>
/// 导出到bytes
/// </summary>
/// <param name="pdfExporterAttribute"></param>
/// <param name="htmlString"></param>
/// <returns></returns>
private Task<byte[]> ExportPdf(
PdfExporterAttribute pdfExporterAttribute,
string htmlString)
{
var objSettings = new ObjectSettings
{
HtmlContent = htmlString,
Encoding = Encoding.UTF8,
PagesCount = pdfExporterAttribute.IsEnablePagesCount ? true : (bool?)null,
WebSettings = { DefaultEncoding = Encoding.UTF8.BodyName },
};
if (pdfExporterAttribute.HeaderSettings != null)
objSettings.HeaderSettings = pdfExporterAttribute.HeaderSettings;
if (pdfExporterAttribute.FooterSettings != null)
objSettings.FooterSettings = pdfExporterAttribute?.FooterSettings;
var htmlToPdfDocument = new HtmlToPdfDocument
{
GlobalSettings =
{
PaperSize = pdfExporterAttribute.PaperKind == PaperKind.Custom
? pdfExporterAttribute.PaperSize : pdfExporterAttribute.PaperKind,
Orientation = pdfExporterAttribute.Orientation,
ColorMode = ColorMode.Color,
DocumentTitle = pdfExporterAttribute.Name
},
Objects =
{
objSettings
}
};
if (pdfExporterAttribute.MarginSettings != null)
{
htmlToPdfDocument.GlobalSettings.Margins = pdfExporterAttribute.MarginSettings;
}
var result = PdfConverter.Convert(htmlToPdfDocument);
return Task.FromResult(result);
}
/// <summary>
/// 获取全局导出定义
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
private static PdfExporterAttribute GetExporterAttribute<T>() where T : class
{
var type = typeof(T);
var exporterTableAttribute = type.GetAttribute<PdfExporterAttribute>(true);
if (exporterTableAttribute != null)
return exporterTableAttribute;
var export = type.GetAttribute<ExporterAttribute>(true) ?? new PdfExporterAttribute();
return new PdfExporterAttribute
{
FontSize = export.FontSize,
HeaderFontSize = export.HeaderFontSize
};
}
/// <summary>
/// 获取全局导出定义
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
private static PdfExporterAttribute GetExporterAttribute(Type type)
{
var exporterTableAttribute = type.GetAttribute<PdfExporterAttribute>(true);
if (exporterTableAttribute != null)
return exporterTableAttribute;
var export = type.GetAttribute<ExporterAttribute>(true) ?? new PdfExporterAttribute();
return new PdfExporterAttribute
{
FontSize = export.FontSize,
HeaderFontSize = export.HeaderFontSize
};
}
/// <summary>
/// 简单实现
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data"></param>
/// <param name="template"></param>
/// <returns></returns>
public async Task<byte[]> ExportBytesByTemplate<T>(T data, string template) where T : class
{
var exporterAttribute = GetExporterAttribute<T>();
var htmlString = await HtmlExporter.ExportByTemplate(data, template);
return await ExportPdf(exporterAttribute, htmlString);
}
/// <summary>
/// 简单实现
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data"></param>
/// <param name="template"></param>
/// <returns></returns>
public async Task<byte[]> ExportListBytesByTemplate<T>(ICollection<T> data, string template) where T : class
{
var exporterAttribute = GetExporterAttribute<T>();
var htmlString = await HtmlExporter.ExportListByTemplate(data, template);
return await ExportPdf(exporterAttribute, htmlString);
}
/// <summary>
/// 根据模板导出
/// </summary>
/// <param name="data"></param>
/// <param name="template"></param>
/// <param name="type"></param>
/// <returns></returns>
public async Task<byte[]> ExportBytesByTemplate(object data, string template, Type type)
{
var exporterAttribute = GetExporterAttribute(type);
var htmlString = await HtmlExporter.ExportByTemplate(data, template, type);
return await ExportPdf(exporterAttribute, htmlString);
}
/// <summary>
/// 导出Pdf
/// </summary>
/// <param name="data"></param>
/// <param name="pdfExporterAttribute"></param>
/// <param name="template"></param>
/// <returns></returns>
public async Task<byte[]> ExportListBytesByTemplate<T>(ICollection<T> data, PdfExporterAttribute pdfExporterAttribute, string template) where T : class
{
var htmlString = await HtmlExporter.ExportListByTemplate(data, template);
return await ExportPdf(pdfExporterAttribute, htmlString);
}
/// <summary>
/// 导出Pdf
/// </summary>
/// <param name="data"></param>
/// <param name="pdfExporterAttribute"></param>
/// <param name="template"></param>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
/// <exception cref="NotImplementedException"></exception>
public async Task<byte[]> ExportBytesByTemplate<T>(T data, PdfExporterAttribute pdfExporterAttribute, string template) where T : class
{
var htmlString = await HtmlExporter.ExportByTemplate(data, template);
return await ExportPdf(pdfExporterAttribute, htmlString);
}
}
}