国产PPT格式控件Spire.Presentation功能演示：使用C＃在PowerPoint中添加或删除数字签名

Spire.Presentation for .NET 是专业的 PowerPoint组件，开发者可以在 .NET 平台上对 PPT文档进行生成、修改、转换和打印等操作，而无需安装 Microsoft PowerPoint。

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添加数字签名

C#

using Spire.Presentation;using System;using System.Security.Cryptography.X509Certificates;namespace AddDigitalSignature{    class Program    {        static void Main(string[] args)        {            //Create a Presentation instance            Presentation ppt = new Presentation();            //Load a PowerPoint document            ppt.LoadFromFile("Input.pptx");            //Add digital signature            X509Certificate2 x509 = new X509Certificate2("gary.pfx", "e-iceblue");            ppt.AddDigitalSignature(x509, "e-iceblue", DateTime.Now);            //Save the result document            ppt.SaveToFile("AddDigitalSignature.pptx", FileFormat.Pptx2013);        }    }}

VB.NET

Imports Spire.PresentationImports SystemImports System.Security.Cryptography.X509CertificatesNamespace AddDigitalSignature    Class Program        Private Shared Sub Main(ByVal args As String())            Dim ppt As Presentation = New Presentation()            ppt.LoadFromFile("Input.pptx")            Dim x509 As X509Certificate2 = New X509Certificate2("gary.pfx", "e-iceblue")            ppt.AddDigitalSignature(x509, "e-iceblue", DateTime.Now)            ppt.SaveToFile("AddDigitalSignature.pptx", FileFormat.Pptx2013)        End Sub    End ClassEnd Namespace

效果图：

删除数字签名

C#

using Spire.Presentation;using System;using System.Security.Cryptography.X509Certificates;namespace RemoveDigitalSignature{    class Program    {        static void Main(string[] args)        {            //Create a Presentation instance            Presentation ppt = new Presentation();            //Load a PowerPoint document            ppt.LoadFromFile("AddDigitalSignature.pptx");            //Detect if the document is digitally signed            if (ppt.IsDigitallySigned == true)            {                //Remove the digital signature                ppt.RemoveAllDigitalSignatures();            }            //Save the result document            ppt.SaveToFile("RemoveDigitalSignature.pptx", FileFormat.Pptx2013);        }    }}

VB.NET

Imports Spire.PresentationImports SystemImports System.Security.Cryptography.X509CertificatesNamespace RemoveDigitalSignature    Class Program        Private Shared Sub Main(ByVal args As String())            Dim ppt As Presentation = New Presentation()            ppt.LoadFromFile("AddDigitalSignature.pptx")            If ppt.IsDigitallySigned = True Then                ppt.RemoveAllDigitalSignatures()            End If            ppt.SaveToFile("RemoveDigitalSignature.pptx", FileFormat.Pptx2013)        End Sub    End ClassEnd Namespace

效果图：

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