Question

我试图将成功加载的Excel文件保存为.xlsm文件，并且我收到以下错误：

{System.InvalidOperationException: Error saving file C:\VS\ExcelManager\ExcelManager\File.xlsm ---> System.TypeLoadException: Could not load type 'System.Security.Cryptography.Pkcs.SignedCms' from assembly 'System.Security, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
   at OfficeOpenXml.VBA.ExcelVbaSignature.GetSignature()
   at OfficeOpenXml.VBA.ExcelVbaSignature..ctor(ZipPackagePart vbaPart)
   at OfficeOpenXml.VBA.ExcelVbaProject.get_Signature()
   at OfficeOpenXml.VBA.ExcelVbaProject.Save()
   at OfficeOpenXml.ExcelWorkbook.Save()
   at OfficeOpenXml.ExcelPackage.Save()
   --- End of inner exception stack trace ---
   at OfficeOpenXml.ExcelPackage.Save()
   at OfficeOpenXml.ExcelPackage.SaveAs(FileInfo file)
   at ExcelManager.Controllers.ExcelController.PrepareExcelFile() in C:\VS\ExcelManager\ExcelManager\Controllers\ExcelController.cs:line 71
   at ExcelManager.Controllers.ExcelController.Get() in C:\VS\ExcelManager\ExcelManager\Controllers\ExcelController.cs:line 80
   at lambda_method(Closure , Object , Object[] )
   at Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(Object target, Object[] parameters)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionMethodAsync>d__12.MoveNext()}

}

这是使用.NET Core 2.0中的EPPlus的代码。

{namespace ExcelManager.Controllers
{
[Route("api/excel")]
public class ExcelController : Controller
{

    //private const string XlsxContentType = "application/vnd.ms-excel.sheet.macroEnabled.12";
    private const string XlsxContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

    private void PrepareExcelFile()
    {
        //https://github.com/JanKallman/EPPlus/issues/31
        //Otherwise, I get an EPP error
        Encoding.RegisterProvider(CodePagesEncodingProvider.Instance); 

        ExcelPackage pck = new ExcelPackage(new System.IO.FileInfo("File.xlsx"));
        pck.Workbook.CreateVBAProject();
        var sb = new StringBuilder();
 //Add VBA Code here
        pck.Workbook.CodeModule.Code = sb.ToString();
        //Save as XLSM

        pck.SaveAs(new System.IO.FileInfo("File.xlsm"));}

我还尝试了EPPlus.CORE nuget包并收到了＃34; Not Supported Exception＆＃34;。除了添加VBA代码之外，我没有尝试对文件进行加密或做任何特殊操作，我手动打开并保存文件没有问题。

非常感谢任何想法。

Answer 1

您的问题缺少一些信息，例如您使用的是什么版本的EPPlus？

无论如何，我做了以下事情：

创建了一个.Net Core 2.0 ASP.net核心MVC项目。安装了EPPLus预发行版v4.5.0.1-beta（支持.net core 2.0）并尝试了以下代码：

 ExcelPackage pck = new ExcelPackage(new System.IO.FileInfo("d:\\a.xlsx"));
        var sb = new StringBuilder();
        //Add VBA Code here
        sb =new StringBuilder( "valid VB code");
        pck.Workbook.CreateVBAProject();
        pck.Workbook.CodeModule.Code = sb.ToString();
        //Save as XLSM

        pck.SaveAs(new System.IO.FileInfo("D:\\a.xlsm"));

它完美无缺。

请确保您使用的是正确的EPPlus版本。

EPPlus：尝试使用SaveAs方法时出现异常：无法加载类型System.Security.Crytopgraphy.Pkcs.SignedCms

1 个答案: