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asp.net微信開發(fā)（高級群發(fā)文本）

首先我們先來講解一下群發(fā)文本信息的過程，我個人開發(fā)程序是首先要有UI才能下手去寫代碼，界面如下，

看圖我們也可以看出首先我們要獲取該微信號本月還能群發(fā)幾條信息，關(guān)于怎么計算，就是群發(fā)成功一條信息，就在本地數(shù)據(jù)庫存儲一條信息，用來計算條數(shù)，（這個我相信都會），大于4條就不能發(fā)送（這里我已經(jīng)限制死了，因為服務(wù)號每月只能發(fā)送4條，多發(fā)送也沒用，用戶只能收到4條，除非使用預(yù)覽功能，挨個發(fā)送，但預(yù)覽功能也只能發(fā)送100次,或許可能使用開發(fā)者模式下群發(fā)信息可以多發(fā)送N次哦，因為我群發(fā)了兩次之后，再進(jìn)入到微信公眾平臺官網(wǎng)后臺看到的居然還能群發(fā)4條，有點(diǎn)郁悶哦！），群發(fā)對象可選擇為全部用戶或分組用戶，和由于節(jié)省群發(fā)次數(shù)，這里我就不測試群發(fā)文字信息了，具體參考如下代碼：

綁定本月剩余群發(fā)條數(shù)

 /// summary> 
 /// 綁定本月剩余群發(fā)條數(shù)
 /// /summary>
 private void BindMassCount()
 {
 WxMassService wms = new WxMassService();
 ListWxMassInfo> wxmaslist = wms.GetMonthMassCount();
 //官方微信服務(wù)號每月只能群發(fā)4條信息，（訂閱號每天1條）多余信息，將不會成功推送，這里已經(jīng)設(shè)定為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('群發(fā)信息已達(dá)上限！請下月初再試！')");
 }
 else
 {
 this.LinkBtnSubSend.Enabled = true;
 this.LinkBtnSubSend.Attributes.Add("Onclick", "return confirm('您確定要群發(fā)此條信息？？')");
 }
 }

綁定分組列表

 /// summary>
 /// 綁定分組列表
 /// /summary>
 private void BindGroupList()
 {
 WeiXinServer wxs = new WeiXinServer();

 ///從緩存讀取accesstoken
 string Access_token = Cache["Access_token"] as string;

 if (Access_token == null)
 {
 //如果為空，重新獲取
 Access_token = wxs.GetAccessToken();

 //設(shè)置緩存的數(shù)據(jù)7000秒后過期
 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();

 //設(shè)置緩存的數(shù)據(jù)7000秒后過期
 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>
 /// 選擇群發(fā)對象類型，顯示隱藏分組列表項
 /// /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(fā)

 /// summary>
 /// 群發(fā)
 /// /summary>
 /// param name="sender">/param>
 /// param name="e">/param>
 protected void LinkBtnSubSend_Click(object sender, EventArgs e)
 {
 //根據(jù)單選按鈕判斷類型，發(fā)送
 ///如果選擇的是文本消息
 if (this.RadioBtnList.SelectedValue.ToString().Equals("0"))
 {
 if (String.IsNullOrWhiteSpace(this.txtwenben.InnerText.ToString().Trim()))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('請輸入您要群發(fā)文本內(nèi)容！');", true);
  return;
 }
 if (this.txtwenben.InnerText.ToString().Trim().Length10)
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('文本內(nèi)容至少需要10個字符以上！');", true);
  return;
 }

 WxMassService wms = new WxMassService();
 ListWxMassInfo> wxmaslist = wms.GetMonthMassCount();

 if (wxmaslist.Count >= 4)
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('本月可群發(fā)消息數(shù)量已達(dá)上限！');", true);
  return;
 }
 else
 {


  //如何群發(fā)類型為全部用戶，根據(jù)openID列表群發(fā)給全部用戶，訂閱號不可用，服務(wù)號認(rèn)證后可用
  if (this.DDLMassType.SelectedValue.ToString().Equals("0"))
  {
  StringBuilder sbs = new StringBuilder();
  sbs.Append(GetAllUserOpenIDList());

  WeiXinServer wxs = new WeiXinServer();

  ///從緩存讀取accesstoken
  string Access_token = Cache["Access_token"] as string;

  if (Access_token == null)
  {
  //如果為空，重新獲取
  Access_token = wxs.GetAccessToken();

  //設(shè)置緩存的數(shù)據(jù)7000秒后過期
  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;

  ///群發(fā)POST數(shù)據(jù)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);

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

  if (jsonObj["errcode"].ToString().Equals("0"))
  {
   //群發(fā)成功后，保存記錄
  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";//群發(fā)成功之后返回的狀態(tài)碼
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群發(fā)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('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)已保存！');location='WxMassManage.aspx';", true);
  return;
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)保存失敗！');", true);
  return;
  }
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)提交失敗！！');", true);
  return;
  }
  }
  else
  {
  string group_id = this.DDLGroupList.SelectedValue.ToString();


  WeiXinServer wxs = new WeiXinServer();

  ///從緩存讀取accesstoken
  string Access_token = Cache["Access_token"] as string;

  if (Access_token == null)
  {
  //如果為空，重新獲取
  Access_token = wxs.GetAccessToken();

  //設(shè)置緩存的數(shù)據(jù)7000秒后過期
  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;

  ///群發(fā)POST數(shù)據(jù)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);

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

  if (jsonObj["errcode"].ToString().Equals("0"))
  {
  //群發(fā)成功后，保存記錄
  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";//群發(fā)成功之后返回的狀態(tài)碼
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群發(fā)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('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)已保存！');location='WxMassManage.aspx';", true);
  return;
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)保存失敗！');", true);
  return;
  }
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)提交失敗！！');", true);
  return;
  }
  }

 
 }
 }
 //如果選擇的是圖文消息
 if (this.RadioBtnList.SelectedValue.ToString().Equals("1"))
 {
 if (String.IsNullOrWhiteSpace(this.lbtuwenmedai_id.Text.ToString().Trim()))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('請選擇或新建圖文素材再進(jìn)行群發(fā)！');", true);
  return;
 }

 WxMassService wms = new WxMassService();

 ListWxMassInfo> wxmaslist = wms.GetMonthMassCount();

 if (wxmaslist.Count >= 4)
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('本月可群發(fā)消息數(shù)量已達(dá)上限！');", true);
  return;
 }
 else
 {
  
  //如何群發(fā)類型為全部用戶，根據(jù)openID列表群發(fā)給全部用戶，訂閱號不可用，服務(wù)號認(rèn)證后可用
  if (this.DDLMassType.SelectedValue.ToString().Equals("0"))
  {
  StringBuilder sbs = new StringBuilder();
  sbs.Append(GetAllUserOpenIDList());

  WeiXinServer wxs = new WeiXinServer();

  ///從緩存讀取accesstoken
  string Access_token = Cache["Access_token"] as string;

  if (Access_token == null)
  {
  //如果為空，重新獲取
  Access_token = wxs.GetAccessToken();

  //設(shè)置緩存的數(shù)據(jù)7000秒后過期
  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;

  ///群發(fā)POST數(shù)據(jù)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);

  //使用前需藥引用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 = "圖文";

  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";//群發(fā)成功之后返回的狀態(tài)碼
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群發(fā)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('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)已保存！');location='WxMassManage.aspx';", true);
   return;
  }
  else
  {
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)保存失敗！');", true);
   return;
  }
  }
  else
  {
  wmi.title = "";
  wmi.contents = "";
  wmi.ImageUrl = "";
  wmi.type = "圖文";

  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";//群發(fā)成功之后返回的狀態(tài)碼
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群發(fā)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('群發(fā)任務(wù)已提交成功！！！圖文部分?jǐn)?shù)據(jù)已保存！');location='WxMassManage.aspx';", true);
   return;
  }
  else
  {
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)保存失敗！');", true);
   return;
  }
  }
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)提交失敗！！');", true);
  return;
  }


  }
  else
  {
  //根據(jù)分組進(jìn)行群發(fā)，訂閱號和服務(wù)號認(rèn)證后均可用

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


  WeiXinServer wxs = new WeiXinServer();

  ///從緩存讀取accesstoken
  string Access_token = Cache["Access_token"] as string;

  if (Access_token == null)
  {
  //如果為空，重新獲取
  Access_token = wxs.GetAccessToken();

  //設(shè)置緩存的數(shù)據(jù)7000秒后過期
  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;

  ///群發(fā)POST數(shù)據(jù)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);

  //使用前需藥引用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 = "圖文";

  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";//群發(fā)成功之后返回的狀態(tài)碼
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群發(fā)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('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)已保存！');location='WxMassManage.aspx';", true);
   return;
  }
  else
  {
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)保存失敗！');", true);
   return;
  }
  }
  else
  {
  wmi.title = "";
  wmi.contents = "";
  wmi.ImageUrl = "";
  wmi.type = "圖文";

  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";//群發(fā)成功之后返回的狀態(tài)碼
  wmi.massMessageID = jsonObj["msg_id"].ToString();//群發(fā)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('群發(fā)任務(wù)已提交成功！！！圖文部分?jǐn)?shù)據(jù)已保存！');location='WxMassManage.aspx';", true);
   return;
  }
  else
  {
   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)已提交成功！！！數(shù)據(jù)保存失敗！');", true);
   return;
  }
  }
  }
  else
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發(fā)任務(wù)提交失敗！！');", true);
  return;
  }
  }
 }
 }
 }

發(fā)送前預(yù)覽

/// summary>
 /// 發(fā)送前預(yù)覽
 /// /summary>
 /// param name="sender">/param>
 /// param name="e">/param>
 protected void LinkBtnSendPreview_Click(object sender, EventArgs e)
 {
 WeiXinServer wxs = new WeiXinServer();

 ///從緩存讀取accesstoken
 string Access_token = Cache["Access_token"] as string;

 if (Access_token == null)
 {
 //如果為空，重新獲取
 Access_token = wxs.GetAccessToken();

 //設(shè)置緩存的數(shù)據(jù)7000秒后過期
 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;

 ///如果選擇的是文本消息
 if (this.RadioBtnList.SelectedValue.ToString().Equals("0"))
 {
 if (String.IsNullOrWhiteSpace(this.txtwenben.InnerText.ToString().Trim()))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('請輸入您要發(fā)送預(yù)覽的文本內(nèi)容！');", true);
  return;
 }
 if (this.txttoUserName.Value.ToString().Trim().Equals("請輸入用戶微信號"))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('請輸入接收消息的用戶微信號！');", true);
  return;
 }
 //文本消息的json數(shù)據(jù){
 // "touser":"OPENID", 可改為對微信號預(yù)覽，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);

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

 if (jsonObj["errcode"].ToString().Equals("0"))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('發(fā)送預(yù)覽成功！！');", true);
  return;
 }
 else
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('發(fā)送預(yù)覽失敗！！');", true);
  return;
 }
 }
 //如果選擇的是圖文消息
 if (this.RadioBtnList.SelectedValue.ToString().Equals("1"))
 {
 if(String.IsNullOrWhiteSpace(this.lbtuwenmedai_id.Text.ToString().Trim()))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('請選擇要預(yù)覽的圖文素材！');", true);
  return;
 }
 if (this.txttoUserName.Value.ToString().Trim().Equals("請輸入用戶微信號"))
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('請輸入接收消息的用戶微信號！');", true);
  return;
 }
 //圖文消息的json數(shù)據(jù){
 // "touser":"OPENID", 可改為對微信號預(yù)覽，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);

 //使用前需藥引用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('發(fā)送預(yù)覽成功！！');", true);
  return;
 }
 else
 {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('發(fā)送預(yù)覽失敗！！');", true);
  return;
 }


 }
 
 }

關(guān)鍵部分，獲取全部用戶的openID并串聯(lián)成字符串：

 /// summary>
 /// 獲取所有微信用戶的OpenID
 /// /summary>
 /// returns>/returns>
 protected string GetAllUserOpenIDList()
 {
 StringBuilder sb = new StringBuilder();

 WeiXinServer wxs = new WeiXinServer();

 ///從緩存讀取accesstoken
 string Access_token = Cache["Access_token"] as string;

 if (Access_token == null)
 {
 //如果為空，重新獲取
 Access_token = wxs.GetAccessToken();

 //設(shè)置緩存的數(shù)據(jù)7000秒后過期
 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();

 //設(shè)置緩存的數(shù)據(jù)7000秒后過期
 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('"');
  sb.Append(jsonObj["data"]["openid"][i].ToString());
  sb.Append('"');
  sb.Append(",");
 }
 }

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

本文已被整理到了《ASP.NET微信開發(fā)教程匯總》，歡迎大家學(xué)習(xí)閱讀。

至此結(jié)束，下一章將繼續(xù)講解群發(fā)圖文信息，因群發(fā)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并群發(fā)，希望大家喜歡。