C # – WeChat public platform interface – upload temporary material

Return: http://blog.niunan.net/blog/show/1212

The most annoying thing to do on WeChat public platform. . The document is unclear, and there is no sample code. I can only search slowly by myself. After working all night, I basically figured it out. Upload the local picture to the temporary material of WeChat and return the media ID for other operations. , The code is as follows: (Import the corresponding class System.Net.Http, LitJson for JSON parsing)

 / // 


 /// Upload temporary materials

 /// Back to media_id

 /// 

 /// 

 /// 

 public string UploadLinShiSuCai(int userid) {

 string imgpath = HttpContext.Current.Server.MapPath($"< /span>/upload/erweima/{userid}_2.png");

 string appid = WxPayConfig.APPID;

 string secret = WxPayConfig.APPSECRET;



 //1. Get AccessToken (validity period is 7200 seconds, developer must Cache access_token globally in your own service)

 string url1 = $"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={appid}&secret={secret}" ;

 string result = HttpService.Get(url1);

 JsonData jd = JsonMapper.ToObject(result);

 string access_token = (string)jd["access_token"< span style="color: #000000;">];



 string url2 = $"https://api.weixin.qq.com/cgi-bin/media/upload?access_token={access_token}&type=image";



 //Picture to stream

 Image img = new Bitmap(imgpath);

 MemoryStream stream = new MemoryStream();

 img.Save(stream, ImageFormat.Png);

 BinaryReader br = new BinaryReader(stream);

 byte[] data = stream.ToArray();

 stream.Close();







 var boundary = "fbce142e-4e8e-4bf3-826d-cc3cf506cccc";

 var client = new HttpClient();

 client.DefaultRequestHeaders.Add("User-Agent ", "KnowledgeCenter span>");

 client.DefaultRequestHeaders.Remove("Expect");

 client.DefaultRequestHeaders.Remove("Connection");

 client.DefaultRequestHeaders.ExpectContinue = false;

 client.DefaultRequestHeaders.ConnectionClose = true;

 var content = new MultipartFormDataContent(boundary);

 content.Headers.Remove("Content-Type ");

 content.Headers.TryAddWithoutValidation("Content-Type ", "multipart/form -data; boundary=" + boundary);

 var contentByte = new ByteArrayContent(data);

 content.Add(contentByte);

 contentByte.Headers.Remove("Content-Disposition ");

 contentByte.Headers.TryAddWithoutValidation("Content-Disposition ", $"form- data; name=\"media\";filename=\"{userid}_2.png\"" + "");

 contentByte.Headers.Remove("Content-Type ");

 contentByte.Headers.TryAddWithoutValidation("Content-Type ", "image/png ");

 try

 {

 var result2 = client.PostAsync(url2, content);

 if (result2.Result.StatusCode != HttpStatusCode.OK)

 throw new Exception(result2.Result.Content.ReadAsStringAsync().Result);

 string jsonstr = result2.Result.Content.ReadAsStringAsync().Result ;

 JsonData jd2 = JsonMapper.ToObject(jsonstr);

 result = (string)jd2["media_id"];

 return result;

}

 catch (Exception ex)

 {

 throw new Exception(ex.Message + ex.InnerException.Message);

}



}

ASP.NET

 /// 


 /// Upload temporary materials

 /// Back to media_id

 /// 

 /// 

 /// 

 public string UploadLinShiSuCai(int userid) {

 string imgpath = HttpContext.Current.Server.MapPath($"< /span>/upload/erweima/{userid}_2.png");

 string appid = WxPayConfig.APPID;

 string secret = WxPayConfig.APPSECRET;



 //1. Get AccessToken (validity period is 7200 seconds, developer must Cache access_token globally in your own service)

 string url1 = $"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={appid}&secret={secret}" ;

 string result = HttpService.Get(url1);

 JsonData jd = JsonMapper.ToObject(result);

 string access_token = (string)jd["access_token"< span style="color: #000000;">];



 string url2 = $"https://api.weixin.qq.com/cgi-bin/media/upload?access_token={access_token}&type=image";



 //Picture to stream

 Image img = new Bitmap(imgpath);

 MemoryStream stream = new MemoryStream();

 img.Save(stream, ImageFormat.Png);

 BinaryReader br = new BinaryReader(stream);

 byte[] data = stream.ToArray();

 stream.Close();







 var boundary = "fbce142e-4e8e-4bf3-826d-cc3cf506cccc";

 var client = new HttpClient();

 client.DefaultRequestHeaders.Add("User-Agent ", "KnowledgeCenter span>");

 client.DefaultRequestHeaders.Remove("Expect");

 client.DefaultRequestHeaders.Remove("Connection");

 client.DefaultRequestHeaders.ExpectContinue = false;

 client.DefaultRequestHeaders.ConnectionClose = true;

 var content = new MultipartFormDataContent(boundary);

 content.Headers.Remove("Content-Type ");

 content.Headers.TryAddWithoutValidation("Content-Type ", "multipart/form -data; boundary=" + boundary);

 var contentByte = new ByteArrayContent(data);

 content.Add(contentByte);

 contentByte.Headers.Remove("Content-Disposition ");

 contentByte.Headers.TryAddWithoutValidation("Content-Disposition ", $"form- data; name=\"media\";filename=\"{userid}_2.png\"" + "");

 contentByte.Headers.Remove("Content-Type ");

 contentByte.Headers.TryAddWithoutValidation("Content-Type ", "image/png ");

 try

 {

 var result2 = client.PostAsync(url2, content);

 if (result2.Result.StatusCode != HttpStatusCode.OK)

 throw new Exception(result2.Result.Content.ReadAsStringAsync().Result);

 string jsonstr = result2.Result.Content.ReadAsStringAsync().Result ;

 JsonData jd2 = JsonMapper.ToObject(jsonstr);

 result = (string)jd2["media_id"];

 return result;

}

 catch (Exception ex)

 {

 throw new Exception(ex.Message + ex.InnerException.Message);

}



}

ASP.NET