Question

我正在使用C＃API示例的修改版本将任务添加到现有Workfront（AtTask）任务。我还想上传和下载文件附件。

从文档中可以看出，上传是一个两步过程，第1步上传文件，第2步将上传的文件附加到任务中。我在某种程度上了解如何执行第二步 - 使用文件名，句柄（来自上载），对象类型（TASK），对象ID和currentVersion发布JSON令牌。我不明白的是第1步，实际上传文件。

我正在创建一个需要附加到任务的PDF文件。任务完成后，将添加一个我需要下载的新文档。

是否有人有任何C＃代码用于执行上传或下载？

到目前为止，这是我的代码：

public JToken DoUpload(string path, string opportunityID, string description, params string[] parameters)
{
    List<string> list = parameters.ToList();

    if (!path.StartsWith("/"))
    {
    path = "/" + path;
    }
    string fullUrl = url + path + ToQueryString(parameters);
    string boundary = "------" + DateTime.Now.Ticks.ToString("x");

    WebRequest request = HttpWebRequest.CreateDefault(new Uri(fullUrl));
    request.ContentType = "multipart/form-data; boundary=" + boundary;
    request.Method = "POST";

    using (var requestStream = request.GetRequestStream())
    {
    using (var writer = new StreamWriter(requestStream))
    {
        writer.WriteLine(string.Format("Content-Disposition: form-data; name=\"{0}\" filename=\"{1}\"",  "uploadedFile", "RFQ" + opportunityID + ".html"));
        writer.WriteLine("Content-Type: text/html; charset=UTF-8");
        writer.WriteLine();
        writer.WriteLine(description);

        using (WebResponse response = request.GetResponse())
        {
        using (Stream responseStream = response.GetResponseStream())
        {
            return ReadResponse(responseStream);
        }
        }
    }
    }
}

Answer 1

第一步是获得一个handel，就像你对POST / attask / api / upload做的任何其他api调用一样，这是你包含文件的地方，它将被上传到Workfront的临时文件夹（AtTask），Workfront将返回handel，然后您执行第二步以更新handdel中的任务，并将文件发布到它。

如需更多参考，请查看https://developers.attask.com/api-docs/和https://developers.attask.com/api-docs/code-samples/

Answer 2

public static string HttpUploadFile(string url, string filename, byte[] file, string paramName, string contentType, NameValueCollection nvc)
{
        string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
        byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

        HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
        wr.ContentType = "multipart/form-data; boundary=" + boundary;
        wr.Method = "POST";
        wr.KeepAlive = true;
        wr.Credentials = System.Net.CredentialCache.DefaultCredentials;

        Stream rs = wr.GetRequestStream();

        string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
        foreach (string key in nvc.Keys)
        {
            rs.Write(boundarybytes, 0, boundarybytes.Length);
            string formitem = string.Format(formdataTemplate, key, nvc[key]);
            byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
            rs.Write(formitembytes, 0, formitembytes.Length);
        }
        rs.Write(boundarybytes, 0, boundarybytes.Length);

        string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";
        string header = string.Format(headerTemplate, paramName, filename, contentType);
        byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
        rs.Write(headerbytes, 0, headerbytes.Length);

                    rs.Write(file, 0, file.Length);

        byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
        rs.Write(trailer, 0, trailer.Length);
        rs.Close();

        WebResponse wresp = null;
        string ret = null;
        try
        {
            wresp = wr.GetResponse();
            Stream stream2 = wresp.GetResponseStream();
            StreamReader reader2 = new StreamReader(stream2);

            ret = reader2.ReadToEnd();
        }
        catch (Exception ex)
        {
            if (wresp != null)
            {
                wresp.Close();
                wresp = null;
            }
        }
        finally
        {
            wr = null;
        }

        return ret;
}

JToken ret = HttpUploadFile("/upload", file_name, file_bytes, "uploadedFile", "", new NameValueCollection());

如何使用AtTask API使用C＃上传文件

2 个答案: