C#代码实现在Excel中添加或删除数字签名

PM> Install-Package Spire.XLS

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

namespace AddSignatureInExcel
{
    class Program
    {
        static void Main(string[] args)
        {
            // 创建 Workbook 实例
            Workbook workbook = new Workbook();

            // 加载 Excel 文件
            workbook.LoadFromFile("Sample.xlsx");

            // 为文件添加数字签名
            X509Certificate2 cert = new X509Certificate2("gary.pfx", "e-iceblue");

            // 定义证书文件路径
            string certificatePath = "gary.pfx";

            DateTime certtime = new DateTime(2020, 7, 1, 7, 10, 36);

            // 使用证书为工作簿添加数字签名
            IDigitalSignatures signature = workbook.AddDigitalSignature(certificatePath, "e-iceblue", "Signed by Gary Zhang", certtime);

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

using Spire.Xls;

namespace DeleteSignatureInExcel
{
    class Program
    {
        static void Main(string[] args)
        {
            // 创建 Workbook 实例
            Workbook workbook = new Workbook();

            // 加载 Excel 文件
            workbook.LoadFromFile("AddDigitalSignature.xlsx");

            // 移除文件中的所有数字签名
            workbook.RemoveAllDigitalSignatures();

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