c#/vb.net 添加或删除 powerpoint 数字签名-人生就是博尊龙凯时

本文将介绍如何使用spire.presentation for .net给powerpoint文档添加数字签名或删除powerpoint文档中的现有数字签名。

添加数字签名

using spire.presentation;
using system;
using system.security.cryptography.x509certificates;
namespace adddigitalsignature
{
    class program
    {
        static void main(string[] args)
        {
            //创建presentation实例
            presentation ppt = new presentation();
            //加载powerpoint文档
            ppt.loadfromfile("input.pptx");
            //添加数字签名
            x509certificate2 x509 = new x509certificate2("gary.pfx", "e-iceblue");
            ppt.adddigitalsignature(x509, "e-iceblue", datetime.now);
            //保存结果文档
            ppt.savetofile("adddigitalsignature.pptx", fileformat.pptx2013);
        }
    }
}

imports spire.presentation
imports system
imports system.security.cryptography.x509certificates
namespace 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 class
end namespace

结果文档：

删除数字签名

using spire.presentation;
using system;
using system.security.cryptography.x509certificates;
namespace removedigitalsignature
{
    class program
    {
        static void main(string[] args)
        {
            //创建presentation实例
            presentation ppt = new presentation();
            //加载powerpoint文档
            ppt.loadfromfile("adddigitalsignature.pptx");
            //判断文档中是否有数字签名
            if (ppt.isdigitallysigned == true)
            {
                //删除所有数字签名
                ppt.removealldigitalsignatures();
            }
            //保存结果文档
            ppt.savetofile("removedigitalsignature.pptx", fileformat.pptx2013);
        }
    }
}

imports spire.presentation
imports system
imports system.security.cryptography.x509certificates
namespace 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 class
end namespace

结果文档：