asp.net微信开发（高级群发图文）

上一篇介绍了如何群发文本消息，本篇将介绍如何群发图文信息，上传图文信息所需的素材，界面如下：

我们先看从素材库中获取图文素材的代码，界面：

素材列表，我是使用的repeater控件，

前台代码如下：

 <!--弹出选择素材窗口-->
  <div id="shownewgroup">
  <div class="closelogin" style="height:40px; background-color:#ddd9ff; line-height:40px;"><span style="float:left; color:#000; font-size:14px; text-indent:5px;">选择素材</span>
  <span style="float:left;margin-left:20px;"><a href="wxnewtuwen.aspx" style="color:red;" onclick="hrefurl();" class="hrefurl">新建图文素材</a></span>
  <a class="closeloginpage"><img src="images/close1.png" alt="" /></a>  </div>
  
  <div style="height:455px; width:100%;">
  <asp:updatepanel id="updatepanel2" runat="server">
   <contenttemplate>
    <div style="width:100%; height:35px; margin:10px;"><asp:linkbutton id="linkbtnselect" runat="server" onclick="linkbtnselect_click" ><div style="background-image:url('images/buttonbg.png'); width:111px; height:35px; float:left; line-height:35px; font-weight:bold; text-align:center;color:#fff;">确认选择</div></asp:linkbutton>
    <span style="float:left;margin-left:20px;"><asp:linkbutton id="linkbtnrefresh" cssclass="linkbtnrefresh" runat="server" onclick="linkbtnrefresh_click"><div style="background-image:url('images/buttonbg.png'); width:111px; height:35px; line-height:35px; font-weight:bold; text-align:center;color:#fff;">刷新</div></asp:linkbutton></span>
    <span style="float:left;margin-left:20px;"><asp:linkbutton id="linkbtndelete" cssclass="linkbtnrefresh" runat="server" onclick="linkbtndelete_click"><div style="background-image:url('images/buttonbg.png'); width:111px; height:35px; line-height:35px; font-weight:bold; text-align:center;color:#fff;">删除素材</div></asp:linkbutton></span>
    </div>
  <div style="word-wrap:break-word;" id="lbnewssucai" runat="server">
   <asp:repeater id="repeatersucailist" runat="server" onitemdatabound="repeatersucailist_itemdatabound">
   <itemtemplate>
    <table style="width:100%; border-top:1px solid #edc9df; border-collapse:collapse; font-size:12px;" >
    <tr>
     <td style="width:100px;"><asp:image id="imageurl" cssclass="fenmianstyle2" runat="server" /></td>
     <td style="text-align:left; width:470px; ">
     <asp:repeater id="repeatersucailist2" runat="server">
      <itemtemplate>
      <ul style="margin:0px;padding:0px;">
       <li><%# eval("title") %></li>
      </ul>
      </itemtemplate>
     </asp:repeater>
     </td>
     <td style="width:130px;">
     <asp:label id="lbupate_time" runat="server" text="label"></asp:label>
     </td>
     <td style="width:50px; text-align:center;">
     <asp:checkbox id="checkin" runat="server" />
     <asp:label id="lbmedia_id" runat="server" visible="false" text=""></asp:label>
     </td>
    </tr>
    </table>
   </itemtemplate> 
   </asp:repeater>
   <div style="font-size:14px; height:30px; line-height:30px; text-indent:10px; border-top:1px solid #ced9df;">
   <span style="float:left;">本类型素材总数量为：</span><span style="float:left; color:red;"><asp:label id="lbtotal_count" runat="server" text="0"></asp:label></span>  
   <span style="float:left; margin-left:20px;">本次获取的素材数量为：</span><span style="float:left; color:red;"><asp:label id="lbitem_count" runat="server" text="0"></asp:label></span>
   </div>
  </div>
   </contenttemplate>
  </asp:updatepanel>
  </div>
 </div>
 <div id="shownewgroupzhezhaoceng"></div>

后台代码如下：

 /// <summary>
 /// 绑定图文素材列表
 /// </summary>
 private void bindnewssucailist()
 {
  weixinserver wxs = new weixinserver();
  string res = "";

  ///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/material/batchget_material?access_token=" + access_tokento;


  //post数据例子： post数据例子：{"type":type,"offset":offset,"count":count}

  string postdata = "{\"type\":\"news\",\"offset\":\"0\",\"count\":\"20\"}";

  res = wxs.getpage(posturl, postdata);

  //使用前需要引用newtonsoft.json.dll文件
  jobject jsonobj = jobject.parse(res);

  int groupsnum = jsonobj["item"].count();

  list<wxnewssucaiiteminfo> newssucaiitemlist = new list<wxnewssucaiiteminfo>();
  list<wxnewssucaiitemlistinfo> wxnewssucaiitemlist = new list<wxnewssucaiitemlistinfo>();
  for (int i = 0; i < groupsnum; i++)
  {
  wxnewssucaiiteminfo newssucaiitem = new wxnewssucaiiteminfo();
  newssucaiitem.media_id = jsonobj["item"][i]["media_id"].tostring();
  newssucaiitem.update_time = jsonobj["item"][i]["update_time"].tostring();
  newssucaiitem.total_count = jsonobj["total_count"].tostring();
  newssucaiitem.item_count = jsonobj["item_count"].tostring();

  newssucaiitemlist.add(newssucaiitem);
  int news_itemcount = jsonobj["item"][i]["content"]["news_item"].count();
  if (news_itemcount > 0)
  {
   for (int j = 0; j < news_itemcount; j++)
   {
   wxnewssucaiitemlistinfo wnscilinfo = new wxnewssucaiitemlistinfo();
   wnscilinfo.title = jsonobj["item"][i]["content"]["news_item"][j]["title"].tostring();
   wnscilinfo.thumb_media_id = jsonobj["item"][i]["content"]["news_item"][j]["thumb_media_id"].tostring();
   wnscilinfo.show_cover_pic = int.parse(jsonobj["item"][i]["content"]["news_item"][j]["show_cover_pic"].tostring());
   wnscilinfo.author = jsonobj["item"][i]["content"]["news_item"][j]["author"].tostring();
   wnscilinfo.digest = jsonobj["item"][i]["content"]["news_item"][j]["digest"].tostring();
   wnscilinfo.content = jsonobj["item"][i]["content"]["news_item"][j]["content"].tostring();
   wnscilinfo.url = jsonobj["item"][i]["content"]["news_item"][j]["url"].tostring();
   wnscilinfo.content_source_url = jsonobj["item"][i]["content"]["news_item"][j]["content_source_url"].tostring();
   wnscilinfo.media_id = newssucaiitem.media_id.tostring();
   wxnewssucaiitemlist.add(wnscilinfo);
   }
  }
  }
  session["wxnewssucaiitemlist"] = wxnewssucaiitemlist;
  this.repeatersucailist.datasource = newssucaiitemlist;
  this.repeatersucailist.databind();
 }

再来看看，新建单图文信息界面：

新建单图文上传封面，删除封面的代码如下：

 /// <summary>
 /// 
 /// </summary>上传图片文件
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void linkbtnfileuploadimg_click(object sender, eventargs e)
 {
  if (this.fileuploadimg.hasfile)
  {
  string filecontenttype = fileuploadimg.postedfile.contenttype;
  if (filecontenttype == "image/bmp" || filecontenttype == "image/gif" || filecontenttype == "image/png" || filecontenttype == "image/x-png" || filecontenttype == "image/jpeg"
   || filecontenttype == "image/pjpeg")
  {
   int filesize = this.fileuploadimg.postedfile.contentlength;

   if (filesize <=2097152)
   {
   string filename = this.fileuploadimg.postedfile.filename; 
   // 客户端文件路径
   string filepath = fileuploadimg.postedfile.filename; //得到的是文件的完整路径,包括文件名，如：c:\documents and settings\administrator\my documents\my pictures\20022775_m.jpg 
   //string filepath = fileupload1.filename;  //得到上传的文件名20022775_m.jpg 
   string filename = filepath.substring(filepath.lastindexof("\\") + 1);//20022775_m.jpg 
   string serverpath = server.mappath("~/weixinimg/") + filename;//取得文件在服务器上保存的位置c:\inetpub\wwwroot\website1\images\20022775_m.jpg 

   this.imgtuwen.imageurl = "~/weixinimg/" + fileuploadimg.filename;
   this.imgtuwen2.visible = true;
   this.imgtuwen2.imageurl = "~/weixinimg/" + fileuploadimg.filename;
   this.fileuploadimg.postedfile.saveas(serverpath);//将上传的文件另存为 
   this.linkbtndeleteimg.visible = true;
   session["filenameimg"] = this.fileuploadimg.postedfile.filename;


   //上传临时图片素材至微信服务器，3天后微信服务器会自动删除

   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);


   //webclient wx_upload = new webclient();
   //wx_upload.credentials = credentialcache.defaultcredentials;
   string url = string.format("http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token={0}&type={1}", access_tokento, "image");

   string result = httpuploadfile(url, serverpath);

   if (result.contains("media_id"))
   {
    //使用前需要引用newtonsoft.json.dll文件
    jobject jsonobj = jobject.parse(result);

    session["imgmedia_id"] = jsonobj["media_id"].tostring();
   }


   response.write("<script>alert('上传图片成功！')</script>");
   }
   else
   {
   response.write("<script>alert('上传文件不能大于2m！')</script>");
   }
   
  }
  else
  {
   response.write("<script>alert('只支持bmp,gif,png,jpg格式的图片！')</script>");
  }
  }
  else
  {
  response.write("<script>alert('请选择图片！')</script>");
  }
 }
 /// <summary> 
 /// http上传文件 
 /// </summary> 
 public static string httpuploadfile(string url, string path)
 {
  // 设置参数 
  httpwebrequest request = webrequest.create(url) as httpwebrequest;
  cookiecontainer cookiecontainer = new cookiecontainer();
  request.cookiecontainer = cookiecontainer;
  request.allowautoredirect = true;
  request.method = "post";
  string boundary = datetime.now.ticks.tostring("x"); // 随机分隔线 
  request.contenttype = "multipart/form-data;charset=utf-8;boundary=" + boundary;
  byte[] itemboundarybytes = encoding.utf8.getbytes("\r\n--" + boundary + "\r\n");
  byte[] endboundarybytes = encoding.utf8.getbytes("\r\n--" + boundary + "--\r\n");

  int pos = path.lastindexof("\\");
  string filename = path.substring(pos + 1);

  //请求头部信息 
  stringbuilder sbheader = new stringbuilder(string.format("content-disposition:form-data;name=\"file\";filename=\"{0}\"\r\ncontent-type:application/octet-stream\r\n\r\n", filename));
  byte[] postheaderbytes = encoding.utf8.getbytes(sbheader.tostring());

  filestream fs = new filestream(path, filemode.open, fileaccess.read);
  byte[] barr = new byte[fs.length];
  fs.read(barr, 0, barr.length);
  fs.close();

  stream poststream = request.getrequeststream();
  poststream.write(itemboundarybytes, 0, itemboundarybytes.length);
  poststream.write(postheaderbytes, 0, postheaderbytes.length);
  poststream.write(barr, 0, barr.length);
  poststream.write(endboundarybytes, 0, endboundarybytes.length);
  poststream.close();

  //发送请求并获取相应回应数据 
  httpwebresponse response = request.getresponse() as httpwebresponse;
  //直到request.getresponse()程序才开始向目标网页发送post请求 
  stream instream = response.getresponsestream();
  streamreader sr = new streamreader(instream, encoding.utf8);
  //返回结果网页（html）代码 
  string content = sr.readtoend();
  return content;
 } 
 /// <summary>
 /// 删除图片
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void linkbtndeleteimg_click(object sender, eventargs e)
 {
  string filename = session["filenameimg"].tostring();

  if (!string.isnullorempty(filename))//确保picpath有值并且不为空。
  {
  
  string serverpath = server.mappath("~/weixinimg/") + filename;//取得文件在服务器上保存的位置c:\inetpub\wwwroot\website1\images\20022775_m.jpg 

  if (file.exists(serverpath))
  {
   try
   {
   file.delete(serverpath);
   this.imgtuwen.imageurl = "weixinimg/fengmiandefault.jpg";
   this.imgtuwen2.visible = false;
   this.imgtuwen2.imageurl = "";
   session["filenameimg"] = null;
   this.linkbtndeleteimg.visible = false;
   }
   catch(exception ex)
   {
   //错误处理：
   response.write(ex.message.tostring());
   }
  }
  }
 }

新建单图文预览代码如下：

 /// <summary>
 /// 预览图文消息
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void linkbtnsendpreview_click(object sender, eventargs e)
 {
  session["media_id"] = null;

  //非空验证
  if (string.isnullorwhitespace(this.txttuwen_title.value.tostring()))
  {
  scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('请输入图文标题！');", true);
  this.txttuwen_title.focus();
  return;
  }
  if (this.imgtuwen2.imageurl.tostring().equals(""))
  {
  scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('必须上传一张图片！');", true);
  this.imgtuwen2.focus();
  return;
  }
  if (string.isnullorwhitespace(this.tbcontent.innertext.tostring()))
  {
  scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('请输入正文内容！');", true);
  this.tbcontent.focus();
  return;
  }

  //对各项进行赋值
  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);



  //post数据例子： post数据例子：
  //{
  // "articles": [{
  // "title": title,
  // "thumb_media_id": thumb_media_id,
  // "author": author,
  // "digest": digest,
  // "show_cover_pic": show_cover_pic(0 / 1),
  // "content": content,
  // "content_source_url": content_source_url
  // },
  // //若新增的是多图文素材，则此处应还有几段articles结构
  // ]
  //}

  string isshow_cover_pic = "";
  if (this.checkfengmianshow.checked)
  {
  isshow_cover_pic = "1";
  }
  else
  {
  isshow_cover_pic = "0";
  }


  string description = nohtml(this.tbcontent.innertext.tostring());

  
  string postdata = "{\"articles\":[{\"title\":\"" + this.txttuwen_title.value.tostring() +
  "\",\"thumb_media_id\":\"" + session["imgmedia_id"].tostring() +
  "\",\"author\":\"" + this.txttuwen_author.value.tostring() +
  "\",\"digest\":\"" + this.txtzhaiyao.innertext.tostring() +
   "\",\"show_cover_pic\":\"" + isshow_cover_pic +
   "\",\"content\":\"" + description +
   "\",\"content_source_url\":\"" + this.txtyuanwenurl.text.tostring() +
   "\"}]}";

  string posturl = string.format("https://api.weixin.qq.com/cgi-bin/media/uploadnews?access_token={0}", access_tokento);

  string jsonres = posturl(posturl, postdata);


  if (jsonres.contains("media_id"))
  {
  //使用前需要引用newtonsoft.json.dll文件
  jobject jsonobj = jobject.parse(jsonres);

  if (this.txttousername.value.tostring().trim().equals("请输入用户微信号"))
  {
   scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('请输入接收消息的用户微信号！');", true);
   return;
  }



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

  //预览图文消息的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 postdatas = "{\"towxname\":\"" + this.txttousername.value.tostring() +
     "\",\"mpnews\":{\"media_id\":\"" + jsonobj["media_id"].tostring() +
     "\"},\"msgtype\":\"mpnews\"}";

  string tuwenres = wxs.getpage(posturls, postdatas);

  //使用前需药引用newtonsoft.json.dll文件
  jobject jsonobjss = jobject.parse(tuwenres);

  if (jsonobjss["errcode"].tostring().equals("0"))
  {
   scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('发送预览成功！！');", true);
   return;
  }
  else
  {
   scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('发送预览失败！！');", true);
   return;
  }
  }
 }
 public static string nohtml(string htmlstring)
 {

  //删除脚本 
  htmlstring = regex.replace(htmlstring, @"<script[^>]*?>.*?</script>", "", regexoptions.ignorecase);

  //替换标签
  htmlstring = htmlstring.replace("\r\n", " ");
  htmlstring = htmlstring.replace("\"", "'");
  htmlstring = htmlstring.replace(" ", " ");
  return htmlstring;

 }

单击确定按钮代码如下：

 /// <summary>
 /// 确认选择
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void linkbtnsubsave_click(object sender, eventargs e)
 {
  session["media_id"] = null;
  //非空验证
  if (string.isnullorwhitespace(this.txttuwen_title.value.tostring()))
  {
  scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('请输入图文标题！');", true);
  return;
  }
  if (this.imgtuwen2.imageurl.tostring().equals(""))
  {
  scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('必须上传一张图片！');", true);
  return;
  }
  if (string.isnullorwhitespace(this.tbcontent.innertext.tostring()))
  {
  scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('请输入正文内容！');", true);
  return;
  }

  //对各项进行赋值
  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);



  //post数据例子： post数据例子：
  //{
  // "articles": [{
  // "title": title,
  // "thumb_media_id": thumb_media_id,
  // "author": author,
  // "digest": digest,
  // "show_cover_pic": show_cover_pic(0 / 1),
  // "content": content,
  // "content_source_url": content_source_url
  // },
  // //若新增的是多图文素材，则此处应还有几段articles结构
  // ]
  //}

  string isshow_cover_pic = "";
  if (this.checkfengmianshow.checked)
  {
  isshow_cover_pic = "1";
  }
  else
  {
  isshow_cover_pic = "0";
  }

  string description = nohtml(this.tbcontent.innertext.tostring());


  string postdata = "{\"articles\":[{\"title\":\"" + this.txttuwen_title.value.tostring() +
  "\",\"thumb_media_id\":\"" + session["imgmedia_id"].tostring() +
  "\",\"author\":\"" + this.txttuwen_author.value.tostring() +
  "\",\"digest\":\"" + this.txtzhaiyao.innertext.tostring() +
   "\",\"show_cover_pic\":\"" + isshow_cover_pic +
   "\",\"content\":\"" + description +
   "\",\"content_source_url\":\"" + this.txtyuanwenurl.text.tostring() +
   "\"}]}";

  string posturl = string.format("https://api.weixin.qq.com/cgi-bin/media/uploadnews?access_token={0}", access_tokento);

  string jsonres = posturl(posturl, postdata);


  if (jsonres.contains("media_id"))
  {
  //使用前需要引用newtonsoft.json.dll文件
  jobject jsonobj = jobject.parse(jsonres);

  wxmpnewsinfo wmninfo = new wxmpnewsinfo();
  wmninfo.title = this.txttuwen_title.value.tostring();
  wmninfo.contents = description.tostring();
  wmninfo.imageurl = this.imgtuwen.imageurl.tostring();
  session["wmninfo"] = wmninfo;
  response.redirect("wxmassmanage.aspx?media_id=" + jsonobj["media_id"].tostring());
  }
 }
 /// <summary> 
 /// 请求url，发送数据 
 /// </summary> 
 public static string posturl(string url, string postdata)
 {
  byte[] data = encoding.utf8.getbytes(postdata);

  // 设置参数 
  httpwebrequest request = webrequest.create(url) as httpwebrequest;
  cookiecontainer cookiecontainer = new cookiecontainer();
  request.cookiecontainer = cookiecontainer;
  request.allowautoredirect = true;
  request.method = "post";
  request.contenttype = "application/x-www-form-urlencoded";
  request.contentlength = data.length;
  stream outstream = request.getrequeststream();
  outstream.write(data, 0, data.length);
  outstream.close();

  //发送请求并获取相应回应数据 
  httpwebresponse response = request.getresponse() as httpwebresponse;
  //直到request.getresponse()程序才开始向目标网页发送post请求 
  stream instream = response.getresponsestream();
  streamreader sr = new streamreader(instream, encoding.utf8);
  //返回结果网页（html）代码 
  string content = sr.readtoend();
  return content;
 }

response.redirect("wxmassmanage.aspx?media_id=" + jsonobj["media_id"].tostring());
这句代码就是将上传图文后得到的media_id参数传送到群发界面，群发界面接收代码如下：

 protected void page_load(object sender, eventargs e)
 {
  if(!page.ispostback)
  {
  bindnewssucailist();//绑定素材列表
  bindgrouplist();//绑定分组列表
  bindmasscount();//绑定本月已群发条数
  this.databind();
  if (request.querystring["media_id"] != null)
  {
   this.radiobtnlist.selectedvalue = "1";
   this.showexpress.visible = false;
   this.txtwenben.visible = false;
   this.tuwen.visible = true;
   this.tuwenxuan.visible = false;
   this.tuwenjian.visible = false;
   this.lbtuwenmedai_id.visible = true;
   this.lbtuwenmedai_id.text = request.querystring["media_id"].tostring();
   this.linkbtndeletetuwen.visible = true;
   this.imageyixuan.visible = true;
  }
  }
 }

最终界面如下：

我这里只接收了一个media_id值，相对于做的简单，直接将值赋值给了一个label用于显示，也可以做成像官网那样，确定选择后，按照图文样式显示.

最后一步：群发按钮代码：其实上一章已经将代码贴出去了，这一章，我就单独贴一遍吧。
 

 /// <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，//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('请选择或新建图文素材再进行群发！');", 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('群发任务已提交成功！！！数据已保存！');location='wxmassmanage.aspx';", true);
         return;
        }
        else
        {
         scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('群发任务已提交成功！！！数据保存失败！');", 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('群发任务已提交成功！！！图文部分数据已保存！');location='wxmassmanage.aspx';", true);
         return;
        }
        else
        {
         scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('群发任务已提交成功！！！数据保存失败！');", true);
         return;
        }
       }
      }
      else
      {
       scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('群发任务提交失败！！');", 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('群发任务已提交成功！！！数据已保存！');location='wxmassmanage.aspx';", true);
         return;
        }
        else
        {
         scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('群发任务已提交成功！！！数据保存失败！');", 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('群发任务已提交成功！！！图文部分数据已保存！');location='wxmassmanage.aspx';", true);
         return;
        }
        else
        {
         scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('群发任务已提交成功！！！数据保存失败！');", true);
         return;
        }
       }
      }
      else
      {
       scriptmanager.registerclientscriptblock(this.page, this.gettype(), "", "alert('群发任务提交失败！！');", true);
       return;
      }
     }
    }
   }
  }

为什么叫群发任务提交成功或失败，因为将信息提交给微信服务器，微信服务器还需审核，审核过程中也有可能审核不通过，不给于群发，所以我起名叫这个，嘿嘿，随便你们怎么起。。。。。

至此群发图文信息功能，已完毕，最后是群发记录，还记得上一章提到的群发成功之后要在本地保存记录吗，保存记录的原因，用于计算当月已群发几条信息，另外还有一个功能就是，群发成功之后，会得到一个消息msgid,根据这个id可以对已经发送成功的信息进行撤销（删除）操作，关于撤销操作：微信官方规定，对群发成功的图文和视频消息，半个小时之内可以进行删除操作，其他消息一经群发成功概不支持此操作。截图如下：

该类用于存储已群发记录的实体类

 /// <summary>
 /// 微信已群发消息实体类，用于记录已群发消息的条数，信息实体
 /// </summary>
 public class wxmassinfo
 {
  public int wxmassno { get; set; }//群发消息编号，数据库自增列

  public string title { get; set; }//图文消息的标题，若消息是文本类型，此项不显示

  public string imageurl { get; set; }//图片地址，若消息是文本类型，此项不显示

  public string type { get; set; }//消息的类型，文本，图文，图片，语音，视频

  public string contents { get; set; }//文本消息的内容，图文消息的正文

  public string massobject { get; set; }//群发对象

  public string massstatus { get; set; }//群发状态

  public string massmessageid{ get; set; }//群发成功后返回的消息id

  public string massdate { get; set; }//群发日期时间

 }

本文已被整理到了《asp.net微信开发教程汇总》，欢迎大家学习阅读。

以上就是本文的全部内容，希望对大家的学习有所帮助。