C# develops WeChat portals and applications using voice processing

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>1357290913</CreateTime>
<MsgType><![CDATA[voice]]></MsgType>
<MediaId><![CDATA[media_id]]></MediaId>
<Format><![CDATA[Format]]></Format>
<MsgId>1234567890123456</MsgId>
</xml>

/// <summary>
    /// 接收的语音消息
    /// </summary>
    [System.Xml.Serialization.XmlRoot(ElementName = "xml")]
    public class RequestVoice : BaseMessage
    {
        public RequestVoice()
        {
            this.MsgType = RequestMsgType.Voice.ToString().ToLower();
        }

        /// <summary>
        /// 语音格式，如amr，speex等
        /// </summary>
        public string Format { get; set; }

        /// <summary>
        /// 语音消息媒体id，可以调用多媒体文件下载接口拉取数据。
        /// </summary>
        public string MediaId { get; set; }
  
        /// <summary>
        /// 消息ID
        /// </summary>
        public Int64 MsgId { get; set; }

        /// <summary>
        /// 语音识别结果，UTF8编码
        /// </summary>
        public string Recognition  { get; set; }

    }

/// <summary>
        /// 对语音请求信息进行处理
        /// </summary>
        /// <param name="info">语音请求信息实体</param>
        /// <returns></returns>
        public string HandleVoice(Entity.RequestVoice info)
        {
            string xml = "";
            // 开通语音识别功能，用户每次发送语音给公众号时，
            // 微信会在推送的语音消息XML数据包中，增加一个Recongnition字段。
            if (!string.IsNullOrEmpty(info.Recognition))
            {
                TextDispatch dispatch = new TextDispatch();
                xml = dispatch.HandleVoiceText(info, info.Recognition);
            }
            else
            {
                xml = "";
            }

            return xml;
        }

/// <summary>
        /// 如果用户用语音读出菜单的内容，那么我们应该先根据菜单对应的事件触发，最后再交给普通事件处理
        /// </summary>
        /// <param name="info"></param>
        /// <returns></returns>
        public string HandleVoiceText(BaseMessage info, string voiceText)
        {
            string xml = "";
            MenuInfo menuInfo = BLLFactory<Menu>.Instance.FindByName(voiceText);
            if (menuInfo != null)
            {
                #region 如果找到菜单对象的处理
                if (menuInfo.Type == "click")
                {
                    //模拟单击事件
                    RequestEventClick eventInfo = new RequestEventClick();
                    eventInfo.CreateTime = info.CreateTime;
                    eventInfo.EventKey = menuInfo.Key;
                    eventInfo.FromUserName = info.FromUserName;
                    eventInfo.ToUserName = info.ToUserName;

                    xml = base.DealEvent(eventInfo, eventInfo.EventKey);
                }
                else
                {
                    //由于无法自动切换到连接，
                    //转换为连接文本供用户进入
                    string content = string.Format("请单击链接进入<a href=\"{0}\">{1}</a> ", menuInfo.Url, menuInfo.Name);

                    ResponseText textInfo = new ResponseText(info);
                    textInfo.Content = content;

                    xml = textInfo.ToXml();
                } 
                #endregion
            }
            else
            {
                //交给事件机制处理
                if (string.IsNullOrEmpty(xml))
                {
                    xml = HandleText(info, voiceText);
                }
            }

            //最后如果没有处理到，那么提示用户的语音内容
            if (string.IsNullOrEmpty(xml))
            {
                ResponseText textInfo = new ResponseText(info);
                textInfo.Content = string.Format("非常抱歉，您输入的语音内容没有找到对应的处理方式。您的语音内容为：{0}", voiceText);
                xml = textInfo.ToXml();
            }

            return xml;
        }