首先引用：Microsoft.Office.Interop.Word.dll

若果 是.net 4.0以上版本新增引用，如果不是4.0以上版本可能沒有這個，可以網上下載一個Microsoft.Office.Interop.Word.dll。

       // 將word檔案中的資料讀取為html語句
        public static string DocToHtml(object wordFileName)
        {
            //在此處放置使用者程式碼以初始化頁面 
            Word.Application word = new Word.Application();
            Type wordType = word.GetType();
            Word.Documents docs = word.Documents;
            //開啟檔案 
            Type docsType = docs.GetType();
            Word.Document doc = (Word.Document)docsType.InvokeMember("Open", System.Reflection.BindingFlags.InvokeMethod, null, docs, new Object[] { wordFileName, true, true });
            //轉換格式，另存為 
            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, Word.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();
        }
 

例如：   <asp:FileUpload ID="fu_NewsContent" runat="server" />

       if (fu_NewsContent.HasFile)
        {
                string fileName = fu_NewsContent.PostedFile.FileName;
                int extendNameIndex = fileName.LastIndexOf(".");
                string extendName = fileName.Substring(extendNameIndex);
                if (extendName == ".doc")
                {
                    string serverPath = Server.MapPath("~/UploadFiles/WordFiles/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/");
                    if (!Directory.Exists(serverPath))
                        Directory.CreateDirectory(serverPath);   //建立路徑
                    DateTime now = DateTime.Now;
                    string fileTime = now.ToString("yyyyMMddHHmmss") + now.Millisecond.ToString() + extendName;
                    fileName = serverPath + fileTime;
                    fu_NewsContent.PostedFile.SaveAs(fileName);   //儲存word

                    string workHtml = CommonHelp.WordToHtml.DocToHtml(fileName);//轉換
                    StreamReader fread = new StreamReader(workHtml, System.Text.Encoding.GetEncoding("gb2312"));
                    string ssRead = fread.ReadToEnd();
                    ssRead = ssRead.Replace("src=\"", "src=\"/UploadFiles/WordFiles/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/");
                    string News_Content = Encoding.Default.GetBytes(ssRead);
                    string News_FileUrl = "/UploadFiles/WordFiles/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/" + fileTime;
                    fread.Close();
                    fread.Dispose();
                }
                else               
                  return;  
         }