asp.net微信開發第六篇----高級群發(文本)

說到高級群發，微信的參考資料http://mp.weixin.qq.com/wiki/14/0c53fac3bdec3906aaa36987b91d64ea.html

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幾條信息，關於怎么計算，就是群發成功一條信息，就在本地數據庫存儲一條信息，用來計算條數，（這個我相信都會），大於4條就不能發送（這里我已經限制死了，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信息可以多發送N次哦，因為我群發了兩次之后，再進入到微信公眾平台官網后台看到的居然還能群發4條，有點郁悶哦！），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，這里我就不測試群發文字信息了，具體參考如下代碼：

 

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

  /// <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();

                //設置緩存的數據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();

                //設置緩存的數據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;
            }
        }

 /// <summary>
        /// 群發
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void LinkBtnSubSend_Click(object sender, EventArgs e)
        {
            //根據單選按鈕判斷類型，發送
                ///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('請輸入您要群發文本內容！');", true);
                    return;
                }
                if (this.txtwenben.InnerText.ToString().Trim().Length<10)
                {
                    ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('文本內容至少需要10個字符以上！');", true);
                    return;
                }

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

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


                      //如何群發類型為全部用戶，根據openID列表群發給全部用戶，訂閱號不可用，服務號認證后可用
                    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();

                            //設置緩存的數據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POST數據示例如下： 
                        //                       {
                        //   "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);

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

                        if (jsonObj["errcode"].ToString().Equals("0"))
                        {
                                       //群發成功后，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";//群發成功之后返回的狀態碼
                            wmi.massMessageID = jsonObj["msg_id"].ToString();//群發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('群發任務已提交成功！！！數據已保存！');location='WxMassManage.aspx';", true);
                                return;
                            }
                            else
                            {
                                ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務已提交成功！！！數據保存失敗！');", true);
                                return;
                            }
                        }
                        else
                        {
                            ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務提交失敗！！');", 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();

                            //設置緩存的數據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POST數據示例如下： 
                            //  {
                            //   "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);

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

                        if (jsonObj["errcode"].ToString().Equals("0"))
                        {
                            //群發成功后，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";//群發成功之后返回的狀態碼
                            wmi.massMessageID = jsonObj["msg_id"].ToString();//群發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('群發任務已提交成功！！！數據已保存！');location='WxMassManage.aspx';", true);
                                return;
                            }
                            else
                            {
                                ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務已提交成功！！！數據保存失敗！');", true);
                                return;
                            }
                        }
                        else
                        {
                            ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務提交失敗！！');", 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行群發！');", true);
                    return;
                }

                WxMassService wms = new WxMassService();

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

                if (wxmaslist.Count >= 4)
                {
                    ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('本月可群發消息數量已達上限！');", true);
                    return;
                }
                else
                {
                    
                    //如何群發類型為全部用戶，根據openID列表群發給全部用戶，訂閱號不可用，服務號認證后可用
                    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();

                            //設置緩存的數據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POST數據示例如下： 
                        //  {
                        //   "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);

                        //使用前需葯引用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";//群發成功之后返回的狀態碼
                                wmi.massMessageID = jsonObj["msg_id"].ToString();//群發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('群發任務已提交成功！！！數據已保存！');location='WxMassManage.aspx';", true);
                                    return;
                                }
                                else
                                {
                                    ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務已提交成功！！！數據保存失敗！');", 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";//群發成功之后返回的狀態碼
                                wmi.massMessageID = jsonObj["msg_id"].ToString();//群發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('群發任務已提交成功！！！圖文部分數據已保存！');location='WxMassManage.aspx';", true);
                                    return;
                                }
                                else
                                {
                                    ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務已提交成功！！！數據保存失敗！');", true);
                                    return;
                                }
                            }
                        }
                        else
                        {
                            ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務提交失敗！！');", true);
                            return;
                        }


                    }
                    else
                    {
                        //根據分組進行群發，訂閱號和服務號認證后均可用

                        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();

                            //設置緩存的數據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POST數據示例如下： 
                        //   {
                        //   "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);

                        //使用前需葯引用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";//群發成功之后返回的狀態碼
                                wmi.massMessageID = jsonObj["msg_id"].ToString();//群發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('群發任務已提交成功！！！數據已保存！');location='WxMassManage.aspx';", true);
                                    return;
                                }
                                else
                                {
                                    ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務已提交成功！！！數據保存失敗！');", 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";//群發成功之后返回的狀態碼
                                wmi.massMessageID = jsonObj["msg_id"].ToString();//群發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('群發任務已提交成功！！！圖文部分數據已保存！');location='WxMassManage.aspx';", true);
                                    return;
                                }
                                else
                                {
                                    ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務已提交成功！！！數據保存失敗！');", true);
                                    return;
                                }
                            }
                        }
                        else
                        {
                            ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('群發任務提交失敗！！');", true);
                            return;
                        }
                    }
                }
            }
        }

/// <summary>
        /// 發送前預覽
        /// </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();

                //設置緩存的數據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('請輸入您要發送預覽的文本內容！');", 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數據{
                //   "touser":"OPENID", 可改為對微信號預覽，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);

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

                if (jsonObj["errcode"].ToString().Equals("0"))
                {
                    ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('發送預覽成功！！');", true);
                    return;
                }
                else
                {
                    ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('發送預覽失敗！！');", 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數據{
               //   "touser":"OPENID", 可改為對微信號預覽，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);

               //使用前需葯引用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('發送預覽成功！！');", true);
                    return;
                }
               else
               {
                   ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('發送預覽失敗！！');", true);
                   return;
               }


            }
           
        }

關鍵部分，獲取全部用戶的openID並串聯成字符串：

 /// <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();

                //設置緩存的數據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();

                //設置緩存的數據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();
        }

 

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。