利用 Aspose.Words 组件，在不依赖与 Office 组件的情况下把 Word 文件转换成 HTML 代码。

首先利用 Nuget 获取 Aspose.Words.dll

public ActionResult AsposeWordsDemo()
{
string srcFileName = Server.MapPath("~/Data/a.doc");
Document doc = new Document(srcFileName);

string basicDirVirtualPath = "/UploadFiles/";

string tempDir = Server.MapPath(basicDirVirtualPath);

HtmlSaveOptions saveOptions = new HtmlSaveOptions();
// Specify folder where images will be saved.
saveOptions.ImagesFolder = tempDir;
// We want the images in the HTML to be referenced in the e-mail as attachments so add the cid prefix to the image file name.
// This replaces what would be the path to the image with the "cid" prefix.
saveOptions.ImagesFolderAlias = basicDirVirtualPath;
// Header footers don't normally export well in HTML format so remove them.
saveOptions.ExportHeadersFootersMode = ExportHeadersFootersMode.None; // saveOptions.ExportHeadersFooters = false; // 老版本用这个

// Save the document to stream in HTML format.
MemoryStream htmlStream = new MemoryStream();
doc.Save(htmlStream, saveOptions);

// Read the HTML from the stream as plain text.
string htmlText = Encoding.UTF8.GetString(htmlStream.ToArray());
htmlStream.Close();

// Save the HTML into the temporary folder.

string htmlFileNameWithoutPath = "Message.html";

Stream htmlFile = new FileStream(Path.Combine(tempDir, htmlFileNameWithoutPath), FileMode.Create);
StreamWriter htmlWriter = new StreamWriter(htmlFile);
htmlWriter.Write(htmlText);
htmlWriter.Close();
htmlFile.Close();

return Redirect(basicDirVirtualPath + htmlFileNameWithoutPath);
}