前言：在.NET 8中使用itext7需安装 itext7 和 itext7.bouncy-castle-fips-adapter 两个Nuget包，或者使用Aspose.PDF、PdfSharpCore、Spire.PDF任意一个第三方包就行
对比：
| 第三方包 | 是否开源 | 是否收费 |
| itext7 | 是 | 不收费，免费使用没有水印 |
| PdfSharpCore | 是 | 不收费，免费使用没有水印 |
| Spire.PDF | 否 | 是，可以免费使用但有水印 |
| Aspose.PDF | 否 | 是，可以免费使用但有水印 |
安装如下Nuget的包
<ItemGroup>
<PackageReference Include="Aspose.PDF" Version="23.11.1" />
<PackageReference Include="itext7" Version="8.0.2" />
<PackageReference Include="itext7.bouncy-castle-fips-adapter" Version="8.0.2" />
<PackageReference Include="PdfSharpCore" Version="1.3.62" />
<PackageReference Include="Spire.PDF" Version="9.12.0" />
</ItemGroup>
项目结构示意图
一、itext7
using iText.Kernel.Pdf;
using iText.Kernel.Utils;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace PdfTest.PdfHelpers
{
public class iText7Helper
{
// https://blog.csdn.net/m0_47619208/article/details/130725907
/// <summary>
/// 合并多个PDF文档
/// 添加NuGet包引用：添加itext7和itext7.bouncy-castle-adapter，后者必须进行添加，否则会在运行报错。
/// NuGet包为iText7,该库满足跨平台需求
/// https://itextpdf.com/
/// https://itextpdf.com/itext-suite-net-c
/// </summary>
/// <param name="fileList"></param>
/// <param name="outFile"></param>
/// <returns></returns>
public static Task MergePdf(string[] fileList, string outFile)
{
using PdfWriter writer = new(outFile);
using PdfDocument pdf = new(writer);
PdfMerger merger = new(pdf);
for (int i = 0; i < fileList.Length; i++)
{
PdfReader reader = new(fileList[i]);
using PdfDocument pdfDocument = new(reader);
merger.Merge(pdfDocument, 1, pdfDocument.GetNumberOfPages());
}
merger.Close();
return Task.CompletedTask;
}
}
}
View Code
二、PdfSharpCore
using PdfSharpCore.Pdf;
using PdfSharpCore.Pdf.IO;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace PdfTest.PdfHelpers
{
public class PdfSharpTool
{
// https://github.com/ststeiger/PdfSharpCore
public static void PdfSharpCoreMerge(string[] files, string outFile)
{
using PdfDocument outPdfFile = new PdfDocument();
foreach (var file in files)
{
using PdfDocument pdfFile = PdfReader.Open(file, PdfDocumentOpenMode.Import);
foreach (var pdfPage in pdfFile.Pages)
{
outPdfFile.AddPage(pdfPage);
}
}
outPdfFile.Save(outFile);
}
}
}
View Code
三、Aspose.PDF
using Aspose.Pdf.Facades;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace PdfTest.PdfHelpers
{
internal class AsposePdfHelper
{
//https://blog.aspose.com/zh/pdf/merge-multiple-pdf-files-in-csharp-net/
//收费
public static void Merge(string[] filesArray, string outFile)
{
// 创建 PdfFileEditor 对象
PdfFileEditor pdfEditor = new PdfFileEditor();
// 合并文件
//pdfEditor.Concatenate("file1.pdf", "file2.pdf", "merged.pdf");
// 合并文件
pdfEditor.Concatenate(filesArray, outFile);
}
public static void MergeStream(FileStream[] streamArray, string outFile)
{
// 创建 PdfFileEditor 对象
PdfFileEditor pdfEditor = new PdfFileEditor();
// 输出流
//FileStream outputStream = new FileStream("Merged.pdf", FileMode.Create);
FileStream outputStream = new FileStream(outFile, FileMode.Create);
//// 输入流
//FileStream inputStream1 = new FileStream("file1.pdf", FileMode.Open);
//FileStream inputStream2 = new FileStream("file2.pdf", FileMode.Open);
//// 合并文件
//pdfEditor.Concatenate(inputStream1, inputStream2, outputStream);
// 创建流数组
//FileStream[] streamArray = new FileStream[3];
//streamArray[0] = new FileStream("file1.pdf", FileMode.Open);
//streamArray[1] = new FileStream("file2.pdf", FileMode.Open);
//streamArray[2] = new FileStream("file3.pdf", FileMode.Open);
// 合并文件
pdfEditor.Concatenate(streamArray, outputStream);
}
}
}
View Code
四、Spire.PDF
using Spire.Pdf;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace PdfTest.PdfHelpers
{
public class SpirePdfHelper
{
//https://www.e-iceblue.com/Introduce/pdf-for-net-introduce.html
//https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/Convert-HTML-to-PDF-Customize-HTML-to-PDF-Conversion-by-Yourself.html
//https://www.cnblogs.com/dongweian/p/14305928.html
//有水印
/// <summary>
/// 合并PDF文件
/// </summary>
/// <param name="files">待合并文件列表</param>
/// <param name="outFile">合并生成的文件名称</param>
public static void SpirePdfMerge(string[] files, string outFile)
{
var doc = PdfDocument.MergeFiles(files);
doc.Save(outFile, FileFormat.PDF);
}
/// <summary>
/// 按每页拆分PDF文件
/// </summary>
/// <param name="inFile">待拆分PDF文件名称</param>
public static void SpirePdfSplit(string inFile)
{
var doc = new PdfDocument(inFile);
doc.Split("SpirePdf_拆分-{0}.pdf");
doc.Close();
}
}
}
View Code
在控制台上调用
using PdfTest.PdfHelpers;
namespace PdfTest
{
internal class Program
{
static void Main(string[] args)
{
// 文件数组索引在前面的后，合并后的PDF，页面也在前面
string [] files = Directory.GetFiles("Merge");
#region Spire.Pdf
//SpirePdfHelper.SpirePdfMerge(files, "SpirePdfMerge.pdf");
//Console.WriteLine("使用 Spire.Pdf 合并文件完成...");
#endregion
#region PdfSharpCore
//PdfSharpTool.PdfSharpCoreMerge(files, "PdfSharpCoreMerge.pdf");
//Console.WriteLine("使用 PdfSharpCore 合并文件完成...");
#endregion
#region iText7
//iText7Helper.MergePdf(files, "iText7PdfMerge.pdf");
//Console.WriteLine("使用 iText7 合并文件完成...");
#endregion
#region AsposePdf
AsposePdfHelper.Merge(files, "AsposePdfMerge.pdf");
Console.WriteLine("使用 AsposePdf 合并文件完成...");
#endregion
Console.ReadKey();
}
}
}
标签：using,FileStream,合并,System,new,pdf,PDF,NET From： https://www.cnblogs.com/hudean/p/17930436.html