asp.net微信開發（高級群發文本）

這篇文章主要介紹了asp.net微信開發中有關高級群發文本的相關內容，需要的朋友可以參考下

首先我們先來講解一下群發文本信息的過程，我個人開發程式是首先要有UI才能下手去寫程式碼，介面如下，

 

#看圖我們也可以看出首先我們要獲取該微訊號本月還能群發幾條訊息，關於怎麼計算，就是群發成功一條訊息，就在本地資料庫儲存一則訊息，用來計算條數，（這個我相信都會），大於4條就不能傳送（這裡我已經限制死了，因為服務號每月只能發送4條，多發送也沒用，用戶只能收到4條，除非使用預覽功能，挨個發送，但預覽功能也只能發送100次,或許可能使用開發者模式下群發訊息可以多發送N次哦，因為我群發了兩次之後，再進入到微信公眾平台官網後台看到的居然還能群發4條，有點鬱悶哦！ ），群發對象可選擇為全部用戶或分組用戶，和由於節省群發次數，這裡我就不測試群發文字訊息了，具體參考如下代碼：

綁定本月剩餘群發條數

 /// <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(&#39;群发信息已达上限！请下月初再试！&#39;)");
 }
 else
 {
 this.LinkBtnSubSend.Enabled = true;
 this.LinkBtnSubSend.Attributes.Add("Onclick", "return confirm(&#39;您确定要群发此条信息？？&#39;)");
 }
 }

#綁定分組清單

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

 ///从缓存读取accesstoken
 string Access_token = Cache["Access_token"] as string;

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

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

 string Access_tokento = Access_token.Substring(17, Access_token.Length - 37);

 string jsonres = "";

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

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

群發

 /// <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(&#39;请输入您要群发文本内容！&#39;);", true);
  return;
 }
 if (this.txtwenben.InnerText.ToString().Trim().Length<10)
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;文本内容至少需要10个字符以上！&#39;);", true);
  return;
 }

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

 if (wxmaslist.Count >= 4)
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;本月可群发消息数量已达上限！&#39;);", 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accesstoken
  string Access_token = Cache["Access_token"] as string;

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

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

  string Access_tokento = Access_token.Substring(17, Access_token.Length - 37);


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

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

  string postData = "{\"touser\":[" + sbs.ToString() +
  "],\"msgtype\":\"text\",\"text\":{\"content\":\"" + this.txtwenben.InnerText.ToString() +
  "\"}";


  string tuwenres = wxs.GetPage(posturl, postData);

  //使用前需药引用Newtonsoft.json.dll文件
  JObject jsonObj = JObject.Parse(tuwenres);

  if (jsonObj["errcode"].ToString().Equals("0"))
  {
   //群发成功后，保存记录
  WxMassInfo wmi = new WxMassInfo();

  wmi.ImageUrl = "";
  wmi.type = "文本";
  wmi.contents = this.txtwenben.InnerText.ToString().Trim();
  wmi.title = this.txtwenben.InnerText.ToString().Substring(0, 10) + "...";

  if (this.DDLMassType.SelectedValue.ToString().Equals("0"))
  {
  wmi.massObject = this.DDLMassType.SelectedItem.Text.ToString();
  }
  else
  {
  wmi.massObject = this.DDLGroupList.SelectedItem.Text.ToString();
  }

  wmi.massStatus = "成功";//群发成功之后返回的状态码
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群发成功之后返回的消息ID


  wmi.massDate = System.DateTime.Now.ToString();

  int num = wms.AddWxMassInfo(wmi);

  if (num > 0)
  {
  Session["wmninfo"] = null;
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据已保存！&#39;);location=&#39;WxMassManage.aspx&#39;;", true);
  return;
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据保存失败！&#39;);", true);
  return;
  }
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务提交失败！！&#39;);", true);
  return;
  }
  }
  else
  {
  string group_id = this.DDLGroupList.SelectedValue.ToString();


  WeiXinServer wxs = new WeiXinServer();

  ///从缓存读取accesstoken
  string Access_token = Cache["Access_token"] as string;

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

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

  string Access_tokento = Access_token.Substring(17, Access_token.Length - 37);


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

  ///群发POST数据示例如下： 
  // {
  // "filter":{
  // "is_to_all":false
  // "group_id":"2"
  // },
  // "text":{
  // "content":"CONTENT"
  // },
  // "msgtype":"text"
  //}
  //}

  string postData = "{\"filter\":{\"is_to_all\":\"false\"\"group_id\":\"" + group_id +
  "\"},\"text\":{\"content\":\"" + this.txtwenben.InnerText.ToString() +
  "\"},\"msgtype\":\"text\"}";


  string tuwenres = wxs.GetPage(posturl, postData);

  //使用前需药引用Newtonsoft.json.dll文件
  JObject jsonObj = JObject.Parse(tuwenres);

  if (jsonObj["errcode"].ToString().Equals("0"))
  {
  //群发成功后，保存记录
  WxMassInfo wmi = new WxMassInfo();

  wmi.ImageUrl = "";
  wmi.type = "文本";
  wmi.contents = this.txtwenben.InnerText.ToString().Trim();
  wmi.title = this.txtwenben.InnerText.ToString().Substring(0, 10) + "...";

  if (this.DDLMassType.SelectedValue.ToString().Equals("0"))
  {
  wmi.massObject = this.DDLMassType.SelectedItem.Text.ToString();
  }
  else
  {
  wmi.massObject = this.DDLGroupList.SelectedItem.Text.ToString();
  }

  wmi.massStatus = "成功";//群发成功之后返回的状态码
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群发成功之后返回的消息ID


  wmi.massDate = System.DateTime.Now.ToString();

  int num = wms.AddWxMassInfo(wmi);

  if (num > 0)
  {
  Session["wmninfo"] = null;
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据已保存！&#39;);location=&#39;WxMassManage.aspx&#39;;", true);
  return;
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据保存失败！&#39;);", true);
  return;
  }
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务提交失败！！&#39;);", true);
  return;
  }
  }

 
 }
 }
 //如果选择的是图文消息
 if (this.RadioBtnList.SelectedValue.ToString().Equals("1"))
 {
 if (String.IsNullOrWhiteSpace(this.lbtuwenmedai_id.Text.ToString().Trim()))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;请选择或新建图文素材再进行群发！&#39;);", true);
  return;
 }

 WxMassService wms = new WxMassService();

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

 if (wxmaslist.Count >= 4)
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;本月可群发消息数量已达上限！&#39;);", 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accesstoken
  string Access_token = Cache["Access_token"] as string;

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

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

  string Access_tokento = Access_token.Substring(17, Access_token.Length - 37);


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

  ///群发POST数据示例如下： 
  // {
  // "touser":[
  // "OPENID1",
  // "OPENID2"
  // ],
  // "mpnews":{
  // "media_id":"123dsdajkasd231jhksad"
  // },
  // "msgtype":"mpnews"
  //}

  string postData = "{\"touser\":[" + sbs.ToString() +
  "],\"mpnews\":{\"media_id\":\"" + this.lbtuwenmedai_id.Text.ToString() +
  "\"},\"msgtype\":\"mpnews\"}";


  string tuwenres = wxs.GetPage(posturl, postData);

  //使用前需药引用Newtonsoft.json.dll文件
  JObject jsonObj = JObject.Parse(tuwenres);

  if (jsonObj["errcode"].ToString().Equals("0"))
  {
  Session["media_id"] = null;
  WxMassInfo wmi = new WxMassInfo();
  if (Session["wmninfo"] != null)
  {
  WxMpNewsInfo wmninfo = Session["wmninfo"] as WxMpNewsInfo;

  wmi.title = wmninfo.title.ToString();
  wmi.contents = wmninfo.contents.ToString();
  wmi.ImageUrl = wmninfo.ImageUrl.ToString();


  wmi.type = "图文";

  if (this.DDLMassType.SelectedValue.ToString().Equals("0"))
  {
   wmi.massObject = this.DDLMassType.SelectedItem.Text.ToString();
  }
  else
  {
   wmi.massObject = this.DDLGroupList.SelectedItem.Text.ToString();
  }

  wmi.massStatus = "成功";//群发成功之后返回的状态码
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群发成功之后返回的消息ID

  wmi.massDate = System.DateTime.Now.ToString();

  int num = wms.AddWxMassInfo(wmi);

  if (num > 0)
  {
   Session["wmninfo"] = null;
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据已保存！&#39;);location=&#39;WxMassManage.aspx&#39;;", true);
   return;
  }
  else
  {
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据保存失败！&#39;);", true);
   return;
  }
  }
  else
  {
  wmi.title = "";
  wmi.contents = "";
  wmi.ImageUrl = "";
  wmi.type = "图文";

  if (this.DDLMassType.SelectedValue.ToString().Equals("0"))
  {
   wmi.massObject = this.DDLMassType.SelectedItem.Text.ToString();
  }
  else
  {
   wmi.massObject = this.DDLGroupList.SelectedItem.Text.ToString();
  }

  wmi.massStatus = "成功";//群发成功之后返回的状态码
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群发成功之后返回的消息ID

  wmi.massDate = System.DateTime.Now.ToString();

  int num = wms.AddWxMassInfo(wmi);

  if (num > 0)
  {
   Session["wmninfo"] = null;
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！图文部分数据已保存！&#39;);location=&#39;WxMassManage.aspx&#39;;", true);
   return;
  }
  else
  {
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据保存失败！&#39;);", true);
   return;
  }
  }
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务提交失败！！&#39;);", true);
  return;
  }


  }
  else
  {
  //根据分组进行群发，订阅号和服务号认证后均可用

  string group_id = this.DDLGroupList.SelectedValue.ToString();


  WeiXinServer wxs = new WeiXinServer();

  ///从缓存读取accesstoken
  string Access_token = Cache["Access_token"] as string;

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

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

  string Access_tokento = Access_token.Substring(17, Access_token.Length - 37);


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

  ///群发POST数据示例如下： 
  // {
  // "filter":{
  // "is_to_all":false
  // "group_id":"2"
  // },
  // "mpnews":{
  // "media_id":"123dsdajkasd231jhksad"
  // },
  // "msgtype":"mpnews"
  //}

  string postData = "{\"filter\":{\"is_to_all\":\"false\"\"group_id\":\""+group_id+
  "\"},\"mpnews\":{\"media_id\":\"" + this.lbtuwenmedai_id.Text.ToString() +
  "\"},\"msgtype\":\"mpnews\"}";


  string tuwenres = wxs.GetPage(posturl, postData);

  //使用前需药引用Newtonsoft.json.dll文件
  JObject jsonObj = JObject.Parse(tuwenres);

  if (jsonObj["errcode"].ToString().Equals("0"))
  {
  Session["media_id"] = null;
  WxMassInfo wmi = new WxMassInfo();
  if (Session["wmninfo"] != null)
  {
  WxMpNewsInfo wmninfo = Session["wmninfo"] as WxMpNewsInfo;

  wmi.title = wmninfo.title.ToString();
  wmi.contents = wmninfo.contents.ToString();
  wmi.ImageUrl = wmninfo.ImageUrl.ToString();


  wmi.type = "图文";

  if (this.DDLMassType.SelectedValue.ToString().Equals("0"))
  {
   wmi.massObject = this.DDLMassType.SelectedItem.Text.ToString();
  }
  else
  {
   wmi.massObject = this.DDLGroupList.SelectedItem.Text.ToString();
  }

  wmi.massStatus = "成功";//群发成功之后返回的状态码
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群发成功之后返回的消息ID

  wmi.massDate = System.DateTime.Now.ToString();

  int num = wms.AddWxMassInfo(wmi);

  if (num > 0)
  {
   Session["wmninfo"] = null;
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据已保存！&#39;);location=&#39;WxMassManage.aspx&#39;;", true);
   return;
  }
  else
  {
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据保存失败！&#39;);", true);
   return;
  }
  }
  else
  {
  wmi.title = "";
  wmi.contents = "";
  wmi.ImageUrl = "";
  wmi.type = "图文";

  if (this.DDLMassType.SelectedValue.ToString().Equals("0"))
  {
   wmi.massObject = this.DDLMassType.SelectedItem.Text.ToString();
  }
  else
  {
   wmi.massObject = this.DDLGroupList.SelectedItem.Text.ToString();
  }

  wmi.massStatus = "成功";//群发成功之后返回的状态码
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群发成功之后返回的消息ID

  wmi.massDate = System.DateTime.Now.ToString();

  int num = wms.AddWxMassInfo(wmi);

  if (num > 0)
  {
   Session["wmninfo"] = null;
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！图文部分数据已保存！&#39;);location=&#39;WxMassManage.aspx&#39;;", true);
   return;
  }
  else
  {
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务已提交成功！！！数据保存失败！&#39;);", true);
   return;
  }
  }
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;群发任务提交失败！！&#39;);", true);
  return;
  }
  }
 }
 }
 }

發送前預覽

##

/// <summary>
 /// 发送前预览
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void LinkBtnSendPreview_Click(object sender, EventArgs e)
 {
 WeiXinServer wxs = new WeiXinServer();

 ///从缓存读取accesstoken
 string Access_token = Cache["Access_token"] as string;

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

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

 string Access_tokento = Access_token.Substring(17, Access_token.Length - 37);


 string posturl = "https://api.weixin.qq.com/cgi-bin/message/mass/preview?access_token=" + Access_tokento;

 ///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(&#39;请输入您要发送预览的文本内容！&#39;);", true);
  return;
 }
 if (this.txttoUserName.Value.ToString().Trim().Equals("请输入用户微信号"))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;请输入接收消息的用户微信号！&#39;);", true);
  return;
 }
 //文本消息的json数据{
 // "touser":"OPENID", 可改为对微信号预览，例如towxname：zhangsan
 // "text":{ 
 // "content":"CONTENT" 
 // }, 
 // "msgtype":"text"
 //}
 string postData = "{\"towxname\":\"" + this.txttoUserName.Value.ToString() +
   "\",\"text\":{\"content\":\"" + this.txtwenben.InnerText.ToString() +
   "\"},\"msgtype\":\"text\"}";

 string tuwenres = wxs.GetPage(posturl, postData);

 //使用前需药引用Newtonsoft.json.dll文件
 JObject jsonObj = JObject.Parse(tuwenres);

 if (jsonObj["errcode"].ToString().Equals("0"))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;发送预览成功！！&#39;);", true);
  return;
 }
 else
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;发送预览失败！！&#39;);", true);
  return;
 }
 }
 //如果选择的是图文消息
 if (this.RadioBtnList.SelectedValue.ToString().Equals("1"))
 {
 if(String.IsNullOrWhiteSpace(this.lbtuwenmedai_id.Text.ToString().Trim()))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;请选择要预览的图文素材！&#39;);", true);
  return;
 }
 if (this.txttoUserName.Value.ToString().Trim().Equals("请输入用户微信号"))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;请输入接收消息的用户微信号！&#39;);", true);
  return;
 }
 //图文消息的json数据{
 // "touser":"OPENID", 可改为对微信号预览，例如towxname：zhangsan
  // "mpnews":{ 
  // "media_id":"123dsdajkasd231jhksad" 
  // },
  // "msgtype":"mpnews" 
  //}
 string postData = "{\"towxname\":\"" + this.txttoUserName.Value.ToString() +
  "\",\"mpnews\":{\"media_id\":\"" + this.lbtuwenmedai_id.Text.ToString() +
  "\"},\"msgtype\":\"mpnews\"}";
 
 string tuwenres = wxs.GetPage(posturl, postData);

 //使用前需药引用Newtonsoft.json.dll文件
 JObject jsonObj = JObject.Parse(tuwenres);

 if (jsonObj["errcode"].ToString().Equals("0"))
 {
  Session["media_id"] = null;
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;发送预览成功！！&#39;);", true);
  return;
 }
 else
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert(&#39;发送预览失败！！&#39;);", true);
  return;
 }


 }
 
 }

關鍵部分，取得全部使用者的openID並串連成字串：

 /// <summary>
 /// 获取所有微信用户的OpenID
 /// </summary>
 /// <returns></returns>
 protected string GetAllUserOpenIDList()
 {
 StringBuilder sb = new StringBuilder();

 WeiXinServer wxs = new WeiXinServer();

 ///从缓存读取accesstoken
 string Access_token = Cache["Access_token"] as string;

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

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

 string Access_tokento = Access_token.Substring(17, Access_token.Length - 37);

 string jsonres = "";

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

 if (content == null)
 {
 jsonres = "https://api.weixin.qq.com/cgi-bin/user/get?access_token=" + Access_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("AllUserOpenList_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);


 if (jsonObj.ToString().Contains("count"))
 {
 int totalnum = int.Parse(jsonObj["count"].ToString());



 for (int i = 0; i < totalnum; i++)
 {
  sb.Append(&#39;"&#39;);
  sb.Append(jsonObj["data"]["openid"][i].ToString());
  sb.Append(&#39;"&#39;);
  sb.Append(",");
 }
 }

 return sb.Remove(sb.ToString().LastIndexOf(","),1).ToString();
 }

至此結束，下一章將繼續講解群發圖文信息，因群發圖文信息之前，需要先上傳圖文信息所需的素材，獲取media_id，所以本章不做介紹，下一章將介紹新建單圖文信息並群發，希望大家喜歡。

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