C#/VB.NET 添加、删除PPT幻灯片中的数字签名

深藏阁楼爱情的钟 2022-12-24 01:48 47阅读 0赞

本文介绍如何通过C\#及VB.NET代码来添加数字签名到PPT幻灯片文档，以及如何将文档中的数字签名删除。

**辅助工具：**

1.  Spire.Presentation.dll （dll版本为5.11.2）

**注意**：2种dll文件下载及引用方法：

**方法1**：***[下载][Link 1]***包，解压到指定路径，并在VS程序中添加引用Spire.Presentation.dll文件；

**方法2**：通过***[Nuget][]***下载。

完成引用后，如下效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0VpY2VibHVl_size_16_color_FFFFFF_t_70][]

**示例1—****添加数字签名到PPT****文档**

using Spire.Presentation;
    using System;
    using System.Security.Cryptography.X509Certificates;
    
    namespace AddDigitalSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //加载PPT测试文档
                Presentation ppt = new Presentation();
                ppt.LoadFromFile("test.pptx");
    
                //添加数字签名
                X509Certificate2 x509 = new X509Certificate2("cer.pfx", "123654");
                ppt.AddDigitalSignature(x509, "Manager", DateTime.Now);
    
                //保存文档
                ppt.SaveToFile("AddDigitalSignature.pptx", FileFormat.Pptx2013);
                System.Diagnostics.Process.Start("AddDigitalSignature.pptx");
            }
        }
    }

**VB.NET**

Imports Spire.Presentation
    Imports System.Security.Cryptography.X509Certificates
    
    Namespace AddDigitalSignature
    	Class Program
    		Private Shared Sub Main(args As String())
    			'加载PPT测试文档
    			Dim ppt As New Presentation()
    			ppt.LoadFromFile("test.pptx")
    
    			'添加数字签名
    			Dim x509 As New X509Certificate2("cer.pfx", "123654")
    			ppt.AddDigitalSignature(x509, "Manager", DateTime.Now)
    
    			'保存文档
    			ppt.SaveToFile("AddDigitalSignature.pptx", FileFormat.Pptx2013)
    			System.Diagnostics.Process.Start("AddDigitalSignature.pptx")
    		End Sub
    	End Class
    End Namespace

数字签名添加效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0VpY2VibHVl_size_16_color_FFFFFF_t_70 1][]

**示例2—****删除PPT****文档中的数字签名**

**C\#**

using Spire.Presentation;
    
    namespace RemoveDigitalSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //加载包含数字签名的PPT文档
                Presentation ppt = new Presentation();
                ppt.LoadFromFile("AddDigitalSignature.pptx");
    
                //判断文档是否已签名
                if (ppt.IsDigitallySigned == true)
                {
                    //移除所有签名
                    ppt.RemoveAllDigitalSignatures();
                }
    
                //保存文档
                ppt.SaveToFile("RemoveDigitalSignature.pptx", FileFormat.Pptx2013);
                System.Diagnostics.Process.Start("RemoveDigitalSignature.pptx");
            }
        }
    }

**VB.NET**

Imports Spire.Presentation
    
    Namespace RemoveDigitalSignature
    	Class Program
    		Private Shared Sub Main(args As String())
    			'加载包含数字签名的PPT文档
    			Dim ppt As New Presentation()
    			ppt.LoadFromFile("AddDigitalSignature.pptx")
    
    			'判断文档是否已签名
    			If ppt.IsDigitallySigned = True Then
    				'移除所有签名
    				ppt.RemoveAllDigitalSignatures()
    			End If
    
    			'保存文档
    			ppt.SaveToFile("RemoveDigitalSignature.pptx", FileFormat.Pptx2013)
    			System.Diagnostics.Process.Start("RemoveDigitalSignature.pptx")
    		End Sub
    	End Class
    End Namespace

[Link 1]: https://www.e-iceblue.cn/Downloads/Spire-Presentation-NET.html
[Nuget]: https://www.nuget.org/packages/Spire.Presentation/#dotnet-cli
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