asp.net微信开发（永久素材管理）

除了3天就会失效的临时素材外，开发者有时需要永久保存一些素材，届时就可以通过本接口新增永久素材。

最近更新，永久图片素材新增后，将带有URL返回给开发者，开发者可以在腾讯系域名内使用（腾讯系域名外使用，图片将被屏蔽）。

请注意：

• 1、新增的永久素材也可以在公众平台官网素材管理模块中看到
• 2、永久素材的数量是有上限的，请谨慎新增。图文消息素材和图片素材的上限为5000，其他类型为1000
• 3、素材的格式大小等要求与公众平台官网一致。具体是，图片大小不超过2M，支持bmp/png/jpeg/jpg/gif格式，语音大小不超过5M，长度不超过60秒，支持mp3/wma/wav/amr格式
• 4、调用该接口需https协议

先来看我自己自定义的后台永久素材管理效果图，如下：

再看看微信官网后台上的显示界面，同步的哦！

首先我们来分析一下步骤：
第一步：如果想让图片在自己的页面显示，首先得先建个实体类吧，用来存储素材的信息吧

/// <summary>
 /// 微信永久素材实体类，用于保存永久素材上传至微信服务器后返回的数据
 /// </summary>
 public class WxSuCaiInfo
 {
 public int SuCaiId { get; set; }//自增列序号

 public string SuCaiUrl { get; set; }// 存储文件名

 public string SuCaiType { get; set; }//素材类型，可分为image,voice,video,thumb(缩略图)

 public string SuCaiTitle { get; set; }//图文消息的标题

 public string SuCaiDigest { get; set; }//图文消息的摘要

 public string SuCaiauthor { get; set; }//图文消息的作者
 public string SuCaishow_cover_pic { get; set; }//图文消息是否显示封面.保存0或1

 public string SuCaicontent { get; set; }//图文消息的正文内容
 public string SuCaicontent_source_url { get; set; }//图文消息的原文链接

 public string media_ID { get; set; }//上传至微信服务器后，返回的永久mediaID

 public string Url { get; set; }//上传至微信服务器后，返回的图片URL，仅图片才会返回此属性

 public string uploadDate { get; set; }//上传日期时间

 }

第二步：上传图片至微信服务器，成功后将返回的media_id和url两个字段数据和其他字段数据一并保存到本地服务器，上传的代码如下：

 /// <summary>
 /// 上传图片至微信服务器,并且本地也保存一份
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void LinBtnUploadImg_Click(object sender, EventArgs e)
 {
  if (this.FileUploadImage.HasFile)
  {
  string fileContentType = FileUploadImage.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.FileUploadImage.PostedFile.ContentLength;

   if (fileSize <= 2097152)
   {
   string fileName = this.FileUploadImage.PostedFile.FileName;
   // 客户端文件路径
   string filepath = FileUploadImage.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

   //把图片上传至本地服务器
   this.FileUploadImage.PostedFile.SaveAs(serverpath);//将上传的文件另存为

   //上传图片素材至微信服务器,永久保存

   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 url = string.Format("http://api.weixin.qq.com/cgi-bin/material/add_material?access_token={0}&type={1}", Access_tokento,"image");

   try
   {

    string res = HttpUploadFile(url, serverpath);
    //判断res结果集里面是否包含media_id
    if (res.Contains("media_id"))
    {
    //如果能进行到这里，那说明图片已经上传至微信服务器，是永久素材哦，
    //开始解析json串，使用前需要引用Newtonsoft.json.dll文件
    JObject jsonObj = JObject.Parse(res);

    //图片上传成功后，返回的是两个字段，media_id和url

    //将两个字段开始存入数据库，保存数据，方便获取列表的时候直接从本地服务器读取
    WxSuCaiInfo wsc = new WxSuCaiInfo();

    wsc.SuCaiUrl = filename;//注意，这里保存的图片名称

    wsc.SuCaiType = "image";//文件类型

    wsc.media_ID = jsonObj["media_id"].ToString();//这个属性保存的是微信返回的media_id

    wsc.Url = jsonObj["url"].ToString();//这个属性保存的才是微信返回的url

    wsc.uploadDate = System.DateTime.Now.ToString();//记录当前文件上传日期时间

    //存入数据库
    WxSuCaiService wscs = new WxSuCaiService();

    int num = wscs.AddWxSuCaiInfo(wsc);

    if (num > 0)
    {
     Response.Write("<script>alert('上传图片素材成功！');location='WxSuCaiMannageImageList.aspx';</script>");
    }
    else
    {
     Response.Write("<script>alert('上传图片素材失败！');location='WxSuCaiMannageImageList.aspx';</script>");
    }
    }
   }
   catch(Exception ex)
   {
    Response.Write(ex.Message.ToString());
   }
   }
   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,JPEG格式的图片！')</script>");
  }
  }
  else
  {
  Response.Write("<script>alert('请选择图片！')</script>");
  }
 }

走到这其实效果已经出来了，接下来看最后一步就是删除选中的素材，删除微信远程服务器的数据--再删除本地服务器的数据，有人问难道这个还有顺序？
其实你可以想象，如果微信服务器的图片没有删除成功，你先把本地服务器的图片删除了，那就和官网同步不了了。
第三步：删除素材

 /// <summary>
 /// 全选全不选
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void CheckAll_CheckedChanged(object sender, EventArgs e)
 {
  foreach (DataListItem item in this.DLSuCaiImageList.Items)
  {
  CheckBox checkIn = item.FindControl("CheckIn") as CheckBox;
  checkIn.Checked = CheckAll.Checked;
  }
 }
 /// <summary>
 /// 删除选中项
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void LinkBtnDeleteSelected_Click(object sender, EventArgs e)
 {
  Boolean ischeck = false;

  foreach (DataListItem item in this.DLSuCaiImageList.Items)
  {
  CheckBox checkIn = item.FindControl("CheckIn") as CheckBox;
  if (checkIn.Checked)
  {
   ischeck = true;
   Label lbSuCaiId = item.FindControl("lbSuCaiId") as Label;
   Label lbSuCaiUrl = item.FindControl("lbSuCaiUrl") as Label;
   Label lbmedia_ID = item.FindControl("lbmedia_ID") as Label;

   //删除微信服务器上的图片
   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/del_material?access_token=" + Access_tokento;

   //POST数据例子： POST数据例子：{"media_id":MEDIA_ID}

   string media_id = lbmedia_ID.Text.ToString();

   string postData = "{\"media_id\":\"" + media_id + "\"}";

   res = wxs.GetPage(posturl, postData);

   if (res.Contains("errcode"))
   {
   //开始解析json串，使用前需要引用Newtonsoft.json.dll文件
   JObject jsonObj = JObject.Parse(res);

   if (jsonObj["errcode"].ToString().Equals("0"))
   {

    ///获取本地服务器的路径
    string serverPathss = Server.MapPath("~/WeiXinImg/") + lbSuCaiUrl.Text.ToString();
    //验证本地服务的路径是否存在该图片
    if (File.Exists(serverPathss))
    {
    //如果存在就删除
    File.Delete(serverPathss);
    }

    WxSuCaiService wscs = new WxSuCaiService();
    //通过media_id删除本地服务器数据库记录
    int num = wscs.DeleteWxSuCaiInfo(lbmedia_ID.Text.ToString());
    if (num > 0)
    {
    Response.Write("<script>alert('图片素材删除成功！');location='WxSuCaiMannageImageList.aspx';</script>");
    }
    else
    {
    Response.Write("<script>alert('微信服务器图片删除成功！本地服务器图片素材删除失败！');location='WxSuCaiMannageImageList.aspx';</script>");
    }
   }
   }
  }
  }
  if (!ischeck)
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('请先选中删除项！！！')", true);
  return;
  }
 }

最后是页面的代码一并奉上，大家仔细研究。

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
 <title></title>
 <link href="css/style.css" rel="Stylesheet" type="text/css" />
 <style type="text/css">
 .meun { width:1100px; height:40px; margin-left:20px; line-height:40px; margin-top:10px;border-bottom:1px solid #d6d6d6;
 }
 .meun ul { padding:0px; margin:0px;
 }
  .meun ul li{ float:left; width:100px; text-align:center;list-style:none;
 }
  .meun ul li:hover{ border-bottom:3px solid #ecd9df; cursor:pointer;
 }
 a:hover { color:#000;
 }
 .checkedstyle { border-bottom:3px solid #208008;
 }
 .meun_imglist { width:1050px; min-height:300px; border:1px solid #d6d6d6; margin-top:20px; margin-left:35px; margin-bottom:30px;
 }
 .uploadstyle { width:300px; background-image:url('images/inputbg.gif'); background-repeat:repeat-x; height:35px; border:1px solid #d6d6d6; float:left; margin-bottom:10px; line-height:35px;
 }
 .CheckAll { float:left; padding:5px;
 }
 .CheckIn { float:left; padding:2px;
 }
 .DLSuCaiImageList { margin-top:10px; margin-left:10px;
 }
 </style>
</head>
<body>
 <form id="form1" runat="server">
 <div class="place">
 <span>位置：</span>
 <ul class="placeul">
  <li><a href="WelCome.aspx" target="rightFrame">首页</a></li>
  <li>微信管理</li>
  <li>德桥员工服务中心--素材管理</li>
 </ul>
 </div>
  <div style="height:30px; line-height:30px; margin-top:10px; margin-left:45px;"><span style="float:left; font-size:16px;">素材管理</span><span style="color:red; float:left; margin-left:20px;">永久素材和微信官网同步，您在这里所操作的任何一项，将影响到官网后台素材管理，谨慎操作！</span></div>
 <div class="meun">
  <ul>
  <li><a href="WxSuCaiManageList.aspx">图文消息</a></li>
  <li class="checkedstyle"><a href="WxSuCaiMannageImageList.aspx">图片库</a></li>
  <li><a href="#">语音</a></li>
  <li><a href="#">视频</a></li>
  </ul>
 </div>
 <div class="meun_imglist">
  <div style="margin:5px auto 10px 10px; height:36px; line-height:36px;">
  <asp:FileUpload ID="FileUploadImage" CssClass="uploadstyle" runat="server" />
  <asp:LinkButton ID="LinBtnUploadImg" runat="server" OnClick="LinBtnUploadImg_Click"><span style="background-image:url('images/buttonbg.png'); width:111px; height:35px; line-height:35px; margin-bottom:10px; font-weight:bold; text-align:center; float:left; margin-left:10px; color:#fff;">上传</span></asp:LinkButton>
  <span style="margin-left:30px; color:red;" >  支持jpg,gif,png,bmp格式图片，大小2M内，如上传成功后，图片未能显示，请将图片重新命名后再尝试上传.</span>
  </div>
  <div style=" clear:both;line-height:35px; margin:10px auto auto auto; height:35px; width:1030px; background-color:#f6f6f6; border-radius:5px; border-bottom:1px solid #d6d6d6;">
  <asp:CheckBox ID="CheckAll" CssClass="CheckAll" AutoPostBack="true" runat="server" OnCheckedChanged="CheckAll_CheckedChanged" />  <span style="float:left; padding:3px;">全选</span>
  <asp:LinkButton ID="LinkBtnDeleteSelected" runat="server" OnClick="LinkBtnDeleteSelected_Click"><span style="width:111px; height:25px; line-height:25px; font-weight:bold; text-align:center; float:left; margin-left:15px; color:#000; background-color:#fff; margin-top:5px; border:1px solid #ecd9df; border-radius:3px;">删除选中</span></asp:LinkButton>
  </div>

  <asp:DataList ID="DLSuCaiImageList" CssClass="DLSuCaiImageList" runat="server" RepeatColumns="6">
  <ItemTemplate>
   <div style="width:150px; height:180px; margin-right:22px;margin-bottom:15px; border:1px solid #d9d9d9;">
   <img src='../WeiXinImg/<%# Eval("SuCaiUrl") %>' style="height:120px; width:150px; border:0px;" />
   <div style="width:150px;height:25px; line-height:25px; text-indent:3px; border-top:1px solid #d9d9d9;">
    <asp:CheckBox ID="CheckIn" CssClass="CheckIn" runat="server" />
    <asp:Label ID="lbSuCaiUrl" ToolTip='<%# Eval("SuCaiUrl")%>' runat="server" Text='<%# Eval("SuCaiUrl").ToString().Length>8?Eval("SuCaiUrl").ToString().Substring(0,8)+"...":Eval("SuCaiUrl").ToString() %>'></asp:Label>
   </div>
   <div style=" clear:both; width:150px;height:25px; line-height:25px; text-indent:5px; border-top:1px solid #d9d9d9;">
    <%# Eval("uploadDate").ToString().Length>20?Eval("uploadDate").ToString().Substring(0,20)+"...":Eval("uploadDate").ToString() %>
    <asp:Label ID="lbSuCaiId" runat="server" Visible="false" Text='<%# Eval("SuCaiId") %>'></asp:Label>
    <asp:Label ID="lbmedia_ID" runat="server" Visible="false" Text='<%# Eval("media_ID") %>'></asp:Label>
   </div>
   </div>
  </ItemTemplate>
  </asp:DataList>

 </div>
 </form>
</body>
</html>

其他素材上传都类似，就不一一介绍了。
新建图文素材界面如下：

从图片库选择图片素材如下：

这是就是从已上传过的图片库中选择的，和图片素材管理界面的功能基本相似，只不过多了一个确认选择的按钮，因为确认选择了之后，要关闭本页，回到新建图文页面，主要代码：

 /// <summary>
 /// 确认选择，选中之后，跳转至新建图文页面
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void LinkBtnSubMitSelected_Click(object sender, EventArgs e)
 {

  Boolean bools = false;
  int num = 0;
  foreach (DataListItem item in this.DLSuCaiImageList.Items)
  {
  CheckBox checkIn = item.FindControl("CheckIn") as CheckBox;

  if (checkIn.Checked)
  {
   num += 1;
   bools = true;
  }
  }
  if (!bools)
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('请选择一个图片素材！！！')", true);
  return;
  }
  if (num >= 2)
  {
  ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "", "alert('您只能选择一个图片素材！');", true);
  return;
  }
  else
  {
  foreach (DataListItem item in this.DLSuCaiImageList.Items)
  {
   CheckBox checkIn = item.FindControl("CheckIn") as CheckBox;

   if (checkIn.Checked)
   {
   ///获取选中图片media_id
   Label lbmedia_ID = item.FindControl("lbmedia_ID") as Label;
   Session["imgmedia_id"] = lbmedia_ID.Text.ToString();
   Response.Write("<script>alert('已选择！');window.opener.location.reload();window.close();</script>");
   }
  }
  }
 }

新建图文的页面在接收的时候可以这样：

 if (Session["imgmedia_id"] != null)
   {
   WxSuCaiService wscs = new WxSuCaiService();

   WxSuCaiInfo wscinfo = wscs.GetWxSuCaiInfo(Session["imgmedia_id"].ToString());

   if(wscinfo!=null)
   {
    this.ImgTuWen.ImageUrl = "~/WeiXinImg/" + wscinfo.SuCaiUrl.ToString();
    this.ImgTuWen2.ImageUrl = "~/WeiXinImg/" + wscinfo.SuCaiUrl.ToString();
    this.ImgTuWen2.Visible = true;
    Session["imgmedia_id"] = wscinfo.media_ID.ToString();//图片的media_id
    Session["fileNameimg"] = wscinfo.SuCaiUrl.ToString();//图片的文件名称
   }

   }

最后新建图文信息的效果图如下：

官方后台如下：

关于编辑图文信息的关键代码如下：

 /// <summary>
 /// 绑定事件
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void DLMpNewsList_ItemDataBound(object sender, DataListItemEventArgs e)
 {
  if(e.Item.ItemType==ListItemType.Item||e.Item.ItemType==ListItemType.AlternatingItem)
  {
  LinkButton LinkBtnDeleteSucai = e.Item.FindControl("LinkBtnDeleteSucai") as LinkButton;

  LinkBtnDeleteSucai.Attributes.Add("OnClick","return confirm('您确定删除该图文素材？？？删除后将和微信官网同步删除！！')");

  HyperLink HyperLinkEdit = e.Item.FindControl("HyperLinkEdit") as HyperLink;

  HyperLinkEdit.Attributes.Add("OnClick", "return confirm('即将进入编辑模式！！是否执行下一步操作？？')");

  Label lbmedia_ID = e.Item.FindControl("lbmedia_ID") as Label;

  HyperLinkEdit.NavigateUrl = "WxNewTuWen.aspx?media_id=" + lbmedia_ID.Text.ToString();//把图文消息的media_id传参到新建图文界面

  }
 }

新建图文页面关键代码如下：

 if(!Page.IsPostBack)
  {
  ///编辑模式
  if (Request.QueryString["media_id"] != null)
  {
   string media_id = Request.QueryString["media_id"].ToString();

   Session["sucaimedia_id"] = media_id;

   WxSuCaiService wscs = new WxSuCaiService();

   WxSuCaiInfo wscinfo = wscs.GetWxSuCaiInfo(media_id);

   if (wscinfo != null)
   {
   this.txttuwen_title.Value = wscinfo.SuCaiTitle.ToString();

   if (wscinfo.SuCaiTitle.ToString().Length > 15)
   {
    this.biaoti_yulan.InnerText = wscinfo.SuCaiTitle.ToString().Substring(0, 15) + "...";
   }
   else
   {
    this.biaoti_yulan.InnerText = wscinfo.SuCaiTitle.ToString();
   }

   this.txttuwen_author.Value = wscinfo.SuCaiauthor.ToString();
   this.txtzhaiyao.InnerText = wscinfo.SuCaiDigest.ToString();
   this.ImgTuWen.ImageUrl = "~/WeiXinImg/" + wscinfo.SuCaiUrl.ToString();
   this.ImgTuWen2.ImageUrl = "~/WeiXinImg/" + wscinfo.SuCaiUrl.ToString();
   this.ImgTuWen2.Visible = true;
   Session["imgmedia_id"] = wscinfo.SuCaithumb_media_id.ToString();
   this.LinkBtnDeleteImg.Visible = true;

   if (!String.IsNullOrWhiteSpace(wscinfo.SuCaicontent_source_url.ToString()))
   {
    this.txtYuanWenUrl.Text = wscinfo.SuCaicontent_source_url.ToString();
    this.txtYuanWenUrl.Visible = true;
    this.CheckYuanWen.Checked = true;
   }

   this.txtYuanWenUrl.Text = wscinfo.SuCaicontent_source_url.ToString();

   this.tbContent.InnerText = wscinfo.SuCaicontent.ToString();

   if (wscinfo.SuCaishow_cover_pic.ToString().Equals("1"))
   {
    this.CheckFengMianShow.Checked = true;
   }
   else
   {
    this.CheckFengMianShow.Checked = false;
   }
   }
  }
  }

编辑提交关键代码如下：

/// <summary>
 /// 保存图文素材和修改按钮公用
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void LinkBtnSaveYongjiu_Click(object sender, EventArgs e)
 {
  //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);

 //根据session判断media_id是否为空，也可根据request.queryString["media_id"]进行判断是否为空
  if (Session["sucaimedia_id"] != null)
  {
  //执行更新操作

  //{
  // "media_id":MEDIA_ID,
  // "index":INDEX,
  // "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
  // }
  //}

  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 = "{\"media_id\":\"" + Session["sucaimedia_id"].ToString() +
   "\",\"index\":\"0\" ,\"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() +
  "\"}}";

  ///修改永久图文素材
  string url = string.Format("https://api.weixin.qq.com/cgi-bin/material/update_news?access_token={0}", Access_tokento);

  string jsonres = PostUrl(url, postData);

  if (jsonres.Contains("errcode"))
  {
   //使用前需要引用Newtonsoft.json.dll文件
   JObject jsonObj = JObject.Parse(jsonres);

   if (jsonObj["errcode"].ToString().Equals("0"))
   {
   //修改本地数据
   //保存数据，方便获取列表的时候直接从本地服务器读取
   WxSuCaiInfo wsc = new WxSuCaiInfo();

   wsc.SuCaiUrl = Session["fileNameimg"].ToString();//注意，这里保存的图片名称

   wsc.SuCaiTitle = this.txttuwen_title.Value.ToString();//图文消息的标题

   wsc.SuCaiDigest = this.txtzhaiyao.InnerText.ToString();//图文消息的摘要

   wsc.SuCaithumb_media_id = Session["imgmedia_id"].ToString();//图文的消息封面media_id

   wsc.SuCaiauthor = this.txttuwen_author.Value.ToString();

   wsc.SuCaishow_cover_pic = isshow_cover_pic;

   wsc.SuCaicontent = description;

   wsc.SuCaicontent_source_url = this.txtYuanWenUrl.Text.ToString();

   wsc.uploadDate = System.DateTime.Now.ToString();//记录当前文件保存图文素材日期时间

   //修改数据库信息
   WxSuCaiService wscs = new WxSuCaiService();

   int num = wscs.UpdateWxSuCaiInfo(Session["sucaimedia_id"].ToString(), wsc);

   if (num > 0)
   {
    Session["sucaimedia_id"] = null;
    Response.Write("<script>alert('图文素材修改成功！');location='WxSuCaiManageList.aspx';</script>");
   }
   else
   {
    Response.Write("<script>alert('图文素材修改失败！');</script>");
   }

   }

  }

  }
  else
  {
  //新增图文素材
  }
 }

需注意：新建图文页面和修改图文页面是公用的一个页面.......

编辑提交按钮和保存按钮是公用的一个按钮.....

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