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[ASP.net教程]asp.net mvc微信公众号开发之上传永久素材

1、上传永久图片素材,注意构造请求头部信息时name="media"就行了

  视图代码:

[email protected] (Html.BeginForm("UploadFile", "MenuConfig", FormMethod.Post, new { enctype = "multipart/form-data" }))
  {
    <span>上传文件</span>
    <input type="file" name="file" id="f" />
    <input id="ButtonUpload" type="submit" value="提交" />
  }

  Action代码:

  /// <summary>

  /// 上传图片素材调用微信接口
  /// </summary>
  /// <param name="file"></param>
  /// <returns></returns>
  public JsonResult UploadPhoto(HttpPostedFileBase file)
  {
    var buf = new byte[file.InputStream.Length];
    file.InputStream.Read(buf, 0, (int)file.InputStream.Length);
    string resultUpload = WeixinConfigBusiness.HttpUploadFile(file.FileName, buf);
    var jsonObj = JsonConvert.DeserializeObject<JObject>(resultUpload);//获取上传后返回的结果状态
    if (jsonObj["media_id"] != null && jsonObj["media_id"].ToString() != "")//如果上传成功.....
    {
      return Json(new { result = true });
    }
      return Json(new { result = false });
  }

  

  /// <summary>
  /// 上传永久图片素材并获取media_id和图片URL
  /// </summary>
  public static string HttpUploadFile(string path, byte[] bf)
  {

    var accessToken = new WeixinConfigBusiness().GetAccessToken();
    string url = string.Format("https://api.weixin.qq.com/cgi-bin/material/add_material?access_token={0}&type={1}", accessToken, "image");
    return HttpUploadPhoto(url, path, bf);
  }
  /// <summary>
  ///
  /// </summary>
  /// <param name="url"></param>
  /// <param name="path"></param>
  /// <param name="bf"></param>
  /// <returns></returns>
  public static string HttpUploadPhoto(string url, string path, byte[] bf)
  {
    var accessToken = new WeixinConfigBusiness().GetAccessToken();
    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=\"media\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName));
    byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());
    Stream postStream = request.GetRequestStream();
    postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
    postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
    postStream.Write(bf, 0, bf.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;
    Stream instream = response.GetResponseStream();
    StreamReader sr = new StreamReader(instream, Encoding.UTF8);
    string content = sr.ReadToEnd();
    return content;
  }