1.导入 Microsoft.Office.Interop.Word.dll文件

2.源代码如下:
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->        /// <summary>
        /// word转成html
        /// </summary>
        /// <param name="wordFileName"></param>
        private string WordToHtml(object wordFileName)
        {
            //在此处放置用户代码以初始化页面
            Word.ApplicationClass word = new Word.ApplicationClass();
            Type wordType = word.GetType();
            Documents docs = word.Documents;

            //打开文件
            Type docsType = docs.GetType();
            Document doc = (Document)docsType.InvokeMember("Open",
            System.Reflection.BindingFlags.InvokeMethod, null, docs, new Object[] { wordFileName, true, true });

            //转换格式，另存为
            Type docType = doc.GetType();

            string wordSaveFileName = wordFileName.ToString();
            string strSaveFileName = wordSaveFileName.Substring(0, wordSaveFileName.Length - 3) + "html";
            object saveFileName = (object)strSaveFileName;
        
            docType.InvokeMember("SaveAs", System.Reflection.BindingFlags.InvokeMethod,
             null, doc, new object[] { saveFileName, WdSaveFormat.wdFormatFilteredHTML });

            docType.InvokeMember("Close", System.Reflection.BindingFlags.InvokeMethod,
             null, doc, null);

            //退出 Word
            wordType.InvokeMember("Quit", System.Reflection.BindingFlags.InvokeMethod,
             null, word, null);

            return saveFileName.ToString();
        }