asp.net微信开发（高级群发文本）

 /// <summary> 
 /// 绑定本月剩余群发条数
 /// </summary>
 private void BindMassCount()
 {
 WxMassService wms = new WxMassService();
 List<WxMassInfo> wxmaslist = wms.GetMonthMassCount();
 //官方微信服务号每月只能群发4条信息，（订阅号每天1条）多余信息，将不会成功推送，这里已经设定为4
 this.lbMassCounts.Text = (4 - int.Parse(wxmaslist.Count.ToString())).ToString();

 if (wxmaslist.Count >= 4)
 {
 this.LinkBtnSubSend.Enabled = false;
 this.LinkBtnSubSend.Attributes.Add("Onclick", "return confirm('群发信息已达上限！请下月初再试！')");
 }
 else
 {
 this.LinkBtnSubSend.Enabled = true;
 this.LinkBtnSubSend.Attributes.Add("Onclick", "return confirm('您确定要群发此条信息？？')");
 }
 }

 /// <summary>
 /// 绑定分组列表
 /// </summary>
 private void BindGroupList()
 {
 WeiXinServer wxs = new WeiXinServer();

 ///从缓存读取aesstoken
 string Aess_token = Cache["Aess_token"] as string;

 if (Aess_token == null)
 {
 //如果为空，重新获取
 Aess_token = wxs.GetAessToken();

 //设置缓存的数据7000秒后过期
 Cache.Insert("Aess_token", Aess_token, null, DateTime.Now.AddSeconds(7000), System.Web.Caching.Cache.NoSlidingExpiration);
 }

 string Aess_tokento = Aess_token.Substring(17, Aess_token.Length - 37);

 string jsonres = "";

 string content = Cache["AllGroups_content"] as string;

 if (content == null)
 {
 jsonres = "https://api.weixin.qq./cgi-bin/groups/get?aess_token=" + Aess_tokento;

 HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(jsonres);
 myRequest.Method = "GET";
 HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
 StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
 content = reader.ReadToEnd();
 reader.Close();

 //设置缓存的数据7000秒后过期
 Cache.Insert("AllGroups_content", content, null, DateTime.Now.AddSeconds(7000), System.Web.Caching.Cache.NoSlidingExpiration);
 }

 //使用前需要引用Newtonsoft.json.dll文件
 JObject jsonObj = JObject.Parse(content);


 int groupsnum = jsonObj["groups"].Count();

 this.DDLGroupList.Items.Clear();//清除

 for (int i = 0; i < groupsnum; i++)
 {
 this.DDLGroupList.Items.Add(new ListItem(jsonObj["groups"][i]["name"].ToString() + "(" + jsonObj["groups"][i]["count"].ToString() + ")", jsonObj["groups"][i]["id"].ToString()));
 }
 }
 /// <summary>
 /// 选择群发对象类型，显示隐藏分组列表项
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void DDLMassType_SelectedIndexChanged(object sender, EventArgs e)
 {
 if (int.Parse(this.DDLMassType.SelectedValue.ToString()) > 0)
 {
 this.DDLGroupList.Visible = true;
 }
 else
 {
  this.DDLGroupList.Visible = false;
 }
 }

 /// <summary>
 /// 群发
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void LinkBtnSubSend_Click(object sender, EventArgs e)
 {
 //根据单选按钮判断类型，发送
 ///如果选择的是文本消息
 if (this.RadioBtnList.SelectedValue.ToString().Equals("0"))
 {
 if (String.IsNullOrWhiteSpace(this.txtwenben.InnerText.ToString().Trim()))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('请输入您要群发文本内容！');", true);
  return;
 }
 if (this.txtwenben.InnerText.ToString().Trim().Length<10)
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('文本内容至少需要10个字符以上！');", true);
  return;
 }

 WxMassService wms = new WxMassService();
 List<WxMassInfo> wxmaslist = wms.GetMonthMassCount();

 if (wxmaslist.Count >= 4)
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('本月可群发消息数量已达上限！');", true);
  return;
 }
 else
 {


  //如何群发类型为全部用户，根据openID列表群发给全部用户，订阅号不可用，服务号认证后可用
  if (this.DDLMassType.SelectedValue.ToString().Equals("0"))
  {
  StringBuilder sbs = new StringBuilder();
  sbs.Append(GetAllUserOpenIDList());

  WeiXinServer wxs = new WeiXinServer();

  ///从缓存读取aesstoken
  string Aess_token = Cache["Aess_token"] as string;

  if (Aess_token == null)
  {
  //如果为空，重新获取
  Aess_token = wxs.GetAessToken();

  //设置缓存的数据7000秒后过期
  Cache.Insert("Aess_token", Aess_token, null, DateTime.Now.AddSeconds(7000), System.Web.Caching.Cache.NoSlidingExpiration);
  }

  string Aess_tokento = Aess_token.Substring(17, Aess_token.Length - 37);


  string posturl = "https://api.weixin.qq./cgi-bin/message/mass/send?aess_token=" + Aess_tokento;

  ///群发POST数据示例如下： 
  //  {
  // "touser":[
  // "OPENID1",
  // "OPENID2"
  // ],
  // "msgtype": "text",
  // "text": { "content": "hello from boxer."}
  /