微信小程序基于腾讯云对象存储的图片上传功能

 /// <summary>    /// 文件流上传    /// 说明: 酷客多小程序    /// 其中分片上传使用SliceUploadInit SliceUploadData SliceUploadFinihs    /// </summary>    /// <param name="bucketName">bucket名称</param>    /// <param name="remotePath">远程文件路径</param>    /// <param name="localPath">本地文件路径</param>    /// <param name="parameterDic">参数Dictionary</param>    /// <returns></returns>    public string UploadFile(string bucketName, string remotePath, Stream file, string filename,Dictionary<string, string> parameterDic = null)    {      if (remotePath.EndsWith("/"))      {        return constructResult(ERRORCode.ERROR_CODE_PARAMETER_ERROE, "file path can not end with '/'");      }      string bizAttribute = "";      if (parameterDic != null && parameterDic.ContainsKey(CosParameters.PARA_BIZ_ATTR))        bizAttribute = parameterDic[CosParameters.PARA_BIZ_ATTR];      int insertOnly = 1;      if (parameterDic != null && parameterDic.ContainsKey(CosParameters.PARA_INSERT_ONLY))      {        try        {          insertOnly = Int32.Parse(parameterDic[CosParameters.PARA_INSERT_ONLY]);        }        catch (Exception e)        {          Console.WriteLine(e.Message);          return constructResult(ERRORCode.ERROR_CODE_PARAMETER_ERROE, "parameter insertOnly value invalidate");        }      }      return Upload(bucketName, remotePath, file, filename, bizAttribute, insertOnly);    }    /// <summary>    /// 单个文件上传    /// 说明: 酷客多小程序    /// <param name="bucketName">bucket名称</param>    /// <param name="remotePath">远程文件路径</param>    /// <param name="localPath">本地文件路径</param>    /// <param name="biz_attr">biz_attr属性</param>    /// <param name="insertOnly">同名文件是否覆盖</param>    /// <returns></returns>    public string Upload(string bucketName, string remotePath, Stream file,string filename,                 string bizAttribute = "", int insertOnly = 1)    {      var url = generateURL(bucketName, remotePath);      var sha1 = SHA1.GetFileSHA1(file);      var data = new Dictionary<string, object>();      data.Add("op", "upload");      data.Add("sha", sha1);      data.Add("biz_attr", bizAttribute);      data.Add("insertOnly", insertOnly);      var expired = getExpiredTime();      var sign = Sign.Signature(appId, secretId, secretKey, expired, bucketName);      var header = new Dictionary<string, string>();      header.Add("Authorization", sign);      return httpRequest.SendRequest(url, ref data, HttpMethod.Post, ref header, timeOut, file, filename);    }    #region 直接上传文件流    public string SendRequest(string url, ref Dictionary<string, object> data, HttpMethod requestMethod,    ref Dictionary<string, string> header, int timeOut, Stream file,string filename, long offset = -1, int sliceSize = 0)    {      try      {        //Console.WriteLine("url:" + url);        System.Net.ServicePointManager.Expect100Continue = false;        if (requestMethod == HttpMethod.Get)        {          var paramStr = "";          foreach (var key in data.Keys)          {            paramStr += string.Format("{0}={1}&", key, HttpUtility.UrlEncode(data[key].ToString()));          }          paramStr = paramStr.TrimEnd('&');          url += (url.EndsWith("?") ? "&" : "?") + paramStr;        }        request = (HttpWebRequest)HttpWebRequest.Create(url);        request.Accept = CosDefaultValue.ACCEPT;        request.KeepAlive = true;        request.UserAgent = CosDefaultValue.USER_AGENT_VERSION;        request.Timeout = timeOut;        foreach (var key in header.Keys)        {          if (key == "Content-Type")          {            request.ContentType = header[key];          }          else          {            request.Headers.Add(key, header[key]);          }        }        if (requestMethod == HttpMethod.Post)        {          request.Method = requestMethod.ToString().ToUpper();          var memStream = new MemoryStream();          if (header.ContainsKey("Content-Type") && header["Content-Type"] == "application/json")          {            var json = JsonConvert.SerializeObject(data);            var jsonByte = Encoding.GetEncoding("utf-8").GetBytes(json.ToString());            memStream.Write(jsonByte, 0, jsonByte.Length);          }          else          {            var boundary = "---------------" + DateTime.Now.Ticks.ToString("x");            var beginBoundary = Encoding.ASCII.GetBytes("/r/n--" + boundary + "/r/n");            var endBoundary = Encoding.ASCII.GetBytes("/r/n--" + boundary + "--/r/n");            request.ContentType = "multipart/form-data; boundary=" + boundary;            var strBuf = new StringBuilder();            foreach (var key in data.Keys)            {              strBuf.Append("/r/n--" + boundary + "/r/n");              strBuf.Append("Content-Disposition: form-data; name=/"" + key + "/"/r/n/r/n");              strBuf.Append(data[key].ToString());            }            var paramsByte = Encoding.GetEncoding("utf-8").GetBytes(strBuf.ToString());            memStream.Write(paramsByte, 0, paramsByte.Length);            memStream.Write(beginBoundary, 0, beginBoundary.Length);            var fileStream = file;            const string filePartHeader =              "Content-Disposition: form-data; name=/"fileContent/"; filename=/"{0}/"/r/n" +              "Content-Type: application/octet-stream/r/n/r/n";            var headerText = string.Format(filePartHeader, filename);            var headerbytes = Encoding.UTF8.GetBytes(headerText);            memStream.Write(headerbytes, 0, headerbytes.Length);            if (offset == -1)            {              var buffer = new byte[1024];              int bytesRead;              while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)              {                memStream.Write(buffer, 0, bytesRead);              }            }            else            {              var buffer = new byte[sliceSize];              int bytesRead;              fileStream.Seek(offset, SeekOrigin.Begin);              bytesRead = fileStream.Read(buffer, 0, buffer.Length);              memStream.Write(buffer, 0, bytesRead);            }            fileStream.Close();            memStream.Write(endBoundary, 0, endBoundary.Length);          }          request.ContentLength = memStream.Length;          var requestStream = request.GetRequestStream();          memStream.Position = 0;          var tempBuffer = new byte[memStream.Length];          memStream.Read(tempBuffer, 0, tempBuffer.Length);          memStream.Close();          requestStream.Write(tempBuffer, 0, tempBuffer.Length);          requestStream.Close();          //Console.WriteLine(strBuf.ToString());        }        //Console.WriteLine(request.ContentType.ToString());        var response = request.GetResponse();        using (var s = response.GetResponseStream())        {          var reader = new StreamReader(s, Encoding.UTF8);          return reader.ReadToEnd();        }      }      catch (WebException we)      {        if (we.Status == WebExceptionStatus.ProtocolError)        {          using (var s = we.Response.GetResponseStream())          {            var reader = new StreamReader(s, Encoding.UTF8);            return reader.ReadToEnd();          }        }        else        {          throw we;        }      }      catch (Exception e)      {        throw e;      }    }