Excel管理控件Aspose.Cells开发者指南（二十三）：将数字签名添加到已经签名的Excel文件中

第五章：关于工作簿的使用

▲第二节：将数字签名添加到已经签名的Excel文件中

Aspose.Cells提供了Workbook.AddDigitalSignature（DigitalSignatureCollection digitalSignatureCollection） 方法，可用于将数字签名添加到已签名的Excel文件中。

注意：在将数字签名添加到已经签名的Excel文档时，请注意，如果原始文档是Aspose.Cells生成的文档，则可以正常工作。但是，如果原始文档是由其他引擎（例如Microsoft Excel等）生成的，则Aspose.Cells无法在加载并重新保存文件后使文件保持不变，这将使原始签名无效。

下面的示例代码演示了如何利用 Workbook.AddDigitalSignature（DigitalSignatureCollection digitalSignatureCollection） 方法将数字签名添加到已签名的Excel文件中。请检查此代码中使用的示例Excel文件。该文件已经过数字签名。屏幕截图显示了执行后示例代码对示例Excel文件的影响。

//Certificate file and its passwordstring certFileName = sourceDir + "AsposeDemo.pfx";string password = "aspose";//Load the workbook which is already digitally signed to add new digital signatureAspose.Cells.Workbook workbook = new Aspose.Cells.Workbook(sourceDir + "sampleDigitallySignedByCells.xlsx");//Create the digital signature collectionAspose.Cells.DigitalSignatures.DigitalSignatureCollection dsCollection = new Aspose.Cells.DigitalSignatures.DigitalSignatureCollection();//Create new certificateSystem.Security.Cryptography.X509Certificates.X509Certificate2 certificate = new System.Security.Cryptography.X509Certificates.X509Certificate2(certFileName, password);//Create new digital signature and add it in digital signature collectionAspose.Cells.DigitalSignatures.DigitalSignature signature = new Aspose.Cells.DigitalSignatures.DigitalSignature(certificate, "Aspose.Cells added new digital signature in existing digitally signed workbook.", DateTime.Now);dsCollection.Add(signature);//Add digital signature collection inside the workbookworkbook.AddDigitalSignature(dsCollection);//Save the workbook and dispose it.workbook.Save(outputDir + "outputDigitallySignedByCells.xlsx");workbook.Dispose();

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