如何用OpenXML将.xltm文件保存到.xlsm？

using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;

string templatePath = "path/to/template.xltm";
using (SpreadsheetDocument templateDoc = SpreadsheetDocument.Open(templatePath, false))
{
    // 在此处进行相关操作
}

string outputPath = "path/to/output.xlsm";
SpreadsheetDocument outputDoc = SpreadsheetDocument.Create(outputPath, SpreadsheetDocumentType.MacroEnabledWorkbook);

foreach (var part in templateDoc.Parts)
{
    // 复制每个部分到新文件
    outputDoc.AddPart(part.OpenXmlPart, part.RelationshipId);
}

outputDoc.Save();
outputDoc.Close();