在Code Project中闲逛时，让我发现了这样一篇文章Create simple Word 2007 documents without needing Word 2007 installed，里面就有提到Office 2007的文档都可以用压缩工具来查看里面的文件，也就是Office 2007的文档是用打包工具把XMLs打包在一起的。因此可以通过.net framework 3.0的System.IO.Packaging来打开docx之类的文档，处理好相关的XMLs，再打包。下面就是这样来处理一个dotx文档，转换成docx文档。
以下代码来自 http://openxmldeveloper.org/forums/post/2816.aspx
1: const string documentRelationshipType = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument";
2: const string wordDOCXContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml";
3: string docName = @"c:\test9\1nameis.dotx";
4: Package wdPackage = Package.Open(docName, FileMode.Open, FileAccess.ReadWrite);
5: PackagePart documentPart = null;
6: Uri documentUri = null;
7:
8: // Get the main document part (document.xml).
9: foreach (System.IO.Packaging.PackageRelationship relationship in wdPackage.GetRelationshipsByType(documentRelationshipType))
10: {
11: documentUri = PackUriHelper.ResolvePartUri(new Uri("/", UriKind.Relative), relationship.TargetUri);
12: documentPart = wdPackage.GetPart(documentUri);
13: // There is only one document.
14: break;
15: }
16:
17: XmlDocument xdoc = new XmlDocument();
18: xdoc.Load(documentPart.GetStream());
19:
20: // Delete the document part and its relationship part.
21: wdPackage.DeletePart(documentPart.Uri);
22:
23: // Create new document and relationship parts using the correct content types.
24:
25: documentPart = wdPackage.CreatePart(documentUri, wordDOCXContentType);
26: xdoc.Save(documentPart.GetStream(FileMode.Create, FileAccess.Write));
27: wdPackage.Close();
28:
29: string newFileName = Path.GetDirectoryName(docName) + @"\" + Path.GetFileNameWithoutExtension(docName) + ".docx";
30: // If the new file exists, delete it. You might
31: // want to make this code less destructive.
32: if (File.Exists(newFileName))
33: {
34: File.Delete(newFileName);
35: }
36: File.Move(docName, newFileName);
37:
System.IO.Packaging 相关文章：
http://msdn.microsoft.com/msdnmag/issues/06/11/BasicInstincts/default.aspx
http://blogs.msdn.com/erikaehrli/archive/2006/08/16/word2007DataDocumentGenerationPart2.aspx
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