Spire.XLS for .NET 是一款专业的 .NET Excel 组件， 它可以用在各种.NET 框架中，包括 .NET Core、ASP.NET 和 Windows Forms 等相关的.NET 应用程序。在Excel表格中图片也是我们经常会使用到的工具，这时我们如何使用Spire.XLS来完成呢？这就是本系列教程将给大家详细讲解的。

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添加和删除数字签名

本文将介绍如何使用Spire.XLS for .NET在Excel中添加和删除数字签名。

添加数字签名

C#

using System;
using System.Security.Cryptography.X509Certificates;
using Spire.Xls;
using Spire.Xls.Core.MergeSpreadsheet.Interfaces;

namespace Add_Digital_Signature
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建Workbook实例
            Workbook workbook = new Workbook();
            //加载Excel文档
            workbook.LoadFromFile("Sample.xlsx");

            //添加数字签名
            X509Certificate2 cert = new X509Certificate2("gary.pfx", "e-iceblue");
            DateTime certtime = new DateTime(2020, 7, 1, 7, 10, 36);
            IDigitalSignatures signature = workbook.AddDigitalSignature(cert, "e-iceblue", certtime);
            
            //保存结果文档
            workbook.SaveToFile("AddDigitalSignature.xlsx", FileFormat.Version2013);
        }
    }
}

VB.NET

Imports System
Imports System.Security.Cryptography.X509Certificates
Imports Spire.Xls
Imports Spire.Xls.Core.MergeSpreadsheet.Interfaces

Namespace Add_Digital_Signature
    Class Program
        Private Shared Sub Main(ByVal args As String())
            Dim workbook As Workbook = New Workbook()
            workbook.LoadFromFile("Sample.xlsx")
            Dim cert As X509Certificate2 = New X509Certificate2("gary.pfx", "e-iceblue")
            Dim certtime As DateTime = New DateTime(2020, 7, 1, 7, 10, 36)
            Dim signature As IDigitalSignatures = workbook.AddDigitalSignature(cert, "e-iceblue", certtime)
            workbook.SaveToFile("AddDigitalSignature.xlsx", FileFormat.Version2013)
        End Sub
    End Class
End Namespace

添加数字签名后的文档截图：

删除数字签名

C#

using Spire.Xls;

namespace Delete_Digital_Signature
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建Workbook实例
            Workbook workbook = new Workbook();
            //加载Excel文档
            workbook.LoadFromFile("AddDigitalSignature.xlsx");

            //删除文档中的数字签名
            workbook.RemoveAllDigitalSignatures();

            //保存结果文档
            workbook.SaveToFile("RemoveDigitalSignature.xlsx", FileFormat.Version2013);
        }
    }
}

VB.NET

Imports Spire.Xls

Namespace Delete_Digital_Signature
    Class Program
        Private Shared Sub Main(ByVal args As String())
            Dim workbook As Workbook = New Workbook()
            workbook.LoadFromFile("AddDigitalSignature.xlsx")
            workbook.RemoveAllDigitalSignatures()
            workbook.SaveToFile("RemoveDigitalSignature.xlsx", FileFormat.Version2013)
        End Sub
    End Class
End Namespace

删除数字签名后的文档截图：