无法打开文档，因为存在包含意外内容类型的无效部分

Question

我在使用演示文稿（PPTX 文件）创建代码打开时遇到错误。我正在使用的代码如下：

  public static void UpdatePPT()
    {
        const string presentationmlNamespace = "http://schemas.openxmlformats.org/presentationml/2006/main";
        const string drawingmlNamespace = "http://schemas.openxmlformats.org/drawingml/2006/main";

        string fileName = Server.MapPath("~/PPT1.pptx");  //path of pptx file


        using (PresentationDocument pptPackage = PresentationDocument.Open(fileName, true))
        {


        } // Using pptPackage
}

我得到的错误是：

"The document cannot be opened because there is an invalid part with an unexpected content type. 
[Part Uri=/ppt/printerSettings/printerSettings1.bin], 
[Content Type=application/vnd.openxmlformats-officedocument.presentationml.printerSettings], 
[Expected Content Type=application/vnd.openxmlformats-officedocument.spreadsheetml.printerSettings]."

错误发生在using (PresentationDocument pptPackage = PresentationDocument.Open(fileName, true))

代码适用于许多 PPTX 文件。但它在某些文件上引发了此错误。我无法找到任何解决方案。感谢您的帮助。

Answer 1

老帖子，但我遇到了同样的问题。我以编程方式解决了它。方法：

我的代码运行using (var document = PresentationDocument.Open(fileName, true)) 如果遇到异常，我有一个类似描述的文档。然后我调用FixPowerpoint()方法并再次执行其他操作。

下面分享一下方法（using System.IO.Packaging）：

private static void FixPowerpoint(string fileName)
{
  //Opening the package associated with file
  using (Package wdPackage = Package.Open(fileName, FileMode.Open, FileAccess.ReadWrite))
  {
    //Uri of the printer settings part
    var binPartUri = new Uri("/ppt/printerSettings/printerSettings1.bin", UriKind.Relative);
    if (wdPackage.PartExists(binPartUri))
    {
      //Uri of the presentation part which contains the relationship
      var presPartUri = new Uri("/ppt/presentation.xml", UriKind.RelativeOrAbsolute);
      var presPart = wdPackage.GetPart(presPartUri);
      //Getting the relationship from the URI
      var presentationPartRels =
          presPart.GetRelationships().Where(a => a.RelationshipType.Equals("http://schemas.openxmlformats.org/officeDocument/2006/relationships/printerSettings",
              StringComparison.InvariantCultureIgnoreCase)).SingleOrDefault();
      if (presentationPartRels != null)
      {
        //Delete the relationship
        presPart.DeleteRelationship(presentationPartRels.Id);
      }

      //Delete the part
      wdPackage.DeletePart(binPartUri);
    }
    wdPackage.Close();
  }
}