n2imageagent.upload.cs

private string UploadImage(string file)
{
            var src = System.IO.File.ReadAllBytes(file);
            Stream stream = new MemoryStream(src);

            HttpContent fileStreamContent = new StreamContent(stream);
            fileStreamContent.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("form-data") { Name = "file", FileName = "xxx.jpg" };
            fileStreamContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");
            using (var client = new HttpClient())
            using (var formData = new MultipartFormDataContent())
            {
                formData.Add(new StringContent("your_token"), "token");
                formData.Add(new StringContent("測試"), "tag");
                // 如果你指定filename 他就會覆蓋原本的圖片
                // formData.Add(new StringContent("testgif"), "filename");
                formData.Add(fileStreamContent, "file");
                // Remember change your domain to https://yourdomain.com/api/upload to upload image.
                var response = client.PostAsync("https://yourdomain.com/api/upload", formData).Result;
                return response.Content.ReadAsStringAsync().Result;
            }

}
        
        
         var result = UploadImage(AppDomain.CurrentDomain.BaseDirectory + "iphone7.jpg");
         
         //response success 
         //success:imageid
         //sample
         //success:01d1z45bm0nw8r4hfqcr6zbv26
         
         //response error
         //error:error result
         //sample
         //error:token null