在trello api文档中，我们具有此POST方法，可使用curl将文件上传到卡中。

curl -v -F token = {TrelloToken} -F file=@test.pdf https://api.trello.com/1/cards/5bbce18fa4a337483b145a57/attachments \？key \ = {APIKey} \＆token \ = {TrelloToken}

当我使用C＃时，我确实构建了此方法来尝试上传图像，但事实证明文件上传（或不上传），但似乎文件范围不正确。我实际上不知道该文件是否是我请求上传的文件，因为下载文件时无法打开。随附的图像显示了我进行的测试的结果。 link中包含文档，但我不知道自己在哪里。

public static string CreateCard(string title,string description,string listId,string imagePath,string key,string token)
    {
        string id = string.Empty;
        string url = "https://api.trello.com/1/cards";
        Cards card = new Cards();
        card.name = title;
        card.desc = description;
        card.idList = listId;
        card.pos = "bottom";
        card.key = key;
        card.token = token;
        card.keepFromSource = "all";
        string jsonData = JsonConvert.SerializeObject(card);
        string serverResponse =   GenericPost(url,jsonData,token,key);
        var objId = JObject.Parse(serverResponse)["id"];
        id = objId.ToString();
        UploadAttachment(key,id,imagePath,title);
        return id;
    }
  public static void UploadAttachment(string key,string token,string cardId,string name)
    {
        System.Windows.Forms.MessageBox.Show(imagePath);
        string url = $"https://api.trello.com/1/cards/{cardId}/attachments";
        Attachments at = new Attachments();
        at.token = token;
        at.key = key;
        at.id = cardId;
        at.file = imagePath;
        at.mimeType = "image/jpeg";
        at.name = name;
        string json = JsonConvert.SerializeObject(at);
       string respo=  GenericPostImage(url,json,key);

    }


public static string GenericPostImage(string url,string JSONpostData,string key)
        {
            var request = (HttpWebRequest)WebRequest.Create(url);
            string header = $"key={key}&token={token}";
            request.Headers.Add(HttpRequestHeader.Authorization,header);
            request.Method = "POST";
            request.ContentType = "application/json";
            using (StreamWriter wtr = new StreamWriter(request.GetRequestStream()))
            {
                wtr.Write(JSONpostData);
                wtr.Close();
            }
            Httpwebresponse response = null;
            string strResponseValue = string.Empty;
            try
            {
                response = (Httpwebresponse)request.GetResponse();
                using (Stream responseStream = response.GetResponseStream())
                {
                    if (responseStream != null)
                    {
                        using (StreamReader reader = new StreamReader(responseStream))
                        {
                            strResponseValue = reader.ReadToEnd();
                        }
                    }
                }
            }
            catch
            {

                System.Windows.Forms.MessageBox.Show("Error");
            }
            return strResponseValue;
        }