//嗨,这很简单。
//First, you should copy your Template file into another location.
string SourcePath = "C:\\MyTemplate.dotx";
string DestPath = "C:\\MyDocument.docx";
System.IO.File.Copy(SourcePath, DestPath);
//After copying the file, you can open a WordprocessingDocument using your Destination Path.
WordprocessingDocument Mydoc = WordprocessingDocument.Open(DestPath, true);
//After openning your document, you can change type of your document after adding additional parts into your document.
mydoc.ChangeDocumentType(WordprocessingDocumentType.Document);
//If you wish, you can edit your document
AttachedTemplate attachedTemplate1 = new AttachedTemplate() { Id = "MyRelationID" };
MainDocumentPart mainPart = mydoc.MainDocumentPart;
MySettingsPart = mainPart.DocumentSettingsPart;
MySettingsPart.Settings.Append(attachedTemplate1);
MySettingsPart.AddExternalRelationship("http://schemas.openxmlformats.org/officeDocument/2006/relationships/attachedTemplate", new Uri(CopyPath, UriKind.Absolute), "MyRelationID");
//Finally you can save your document.
mainPart.Document.Save();