新增 引用： Microsoft.Office.Interop.Word

  /// <summary>
        /// 讀取word裡面的資訊的方法
        /// </summary>
        /// <param name="filePath">檔案路徑</param>
        /// <returns>檔案的內容</returns>
        public static string ReadWordContent(string filePath)
        {
            string WordContent = "";
            try
            {
                Microsoft.Office.Interop.Word.ApplicationClass app = new ApplicationClass();
                object fileName = filePath;

                object optional = System.Reflection.Missing.Value;
                object visible = true;
                if (File.Exists(fileName.ToString()))
                {
                    Microsoft.Office.Interop.Word.Document doc = app.Documents.Open(
                     ref fileName,
                     ref optional,
                     ref optional,
                     ref optional,
                     ref optional,
                     ref optional,
                     ref optional,
                     ref optional,
                     ref optional,
                     ref optional,
                     ref optional, ref optional,
                     ref optional,
                     ref optional, ref optional,
                     ref optional);

                    object first = 0;
                    object units = WdUnits.wdCharacter;
                    object last = doc.Characters.Count;

                    WordContent = doc.Range(ref first, ref last).Text;
                    object saveChanges = WdSaveOptions.wdDoNotSaveChanges;
                    object originalFormat = System.Reflection.Missing.Value;
                    object routeDocument = System.Reflection.Missing.Value;
                    app.Quit(ref saveChanges, ref originalFormat, ref routeDocument);

                }
                else
                {
                    WordContent = "";
                }
            }
            catch (Exception)
            {

                WordContent = "";
            }
            return WordContent;
        }