通过 Rest api 上传到 Azure devops 的附件未打开

Question

您好，我已关注 Microsoft 文档并上传了附件 devops 并成功将其附加到工作项。但是当我从 devops userinteface 文件下载文件时显示但无法打开它。 这是代码

正在将 Iformfile 对象转换为二进制文件 提前致谢:)

 foreach (var item in enterddetals.Attachments)
            {
                TicketAttachemnts attachemnt = new TicketAttachemnts();
                attachemnt.TicketNo = enterddetals.TicketNo;
                attachemnt.Name = Path.GetFileName(item.FileName);
                attachemnt.FileType = Path.GetExtension(item.FileName);
                using (var target = new MemoryStream())
                {   
                    item.CopyTo(target);
                    attachemnt.FileContent = target.ToArray();
                }
                string attachjson = JsonConvert.SerializeObject(attachemnt);
                response = await _azuredevopsmnger.CreateAttachement("DevOps/CreateAttachement",attachjson);
              

正在创建附件并将其链接到工作项

  ResultClass res = new ResultClass();
                var personalaccesstoken = "";
                string baseUrl = "https://.../_apis/wit/attachments?fileName={0}&api-version=5.0";
                string baseUrl2 = "https:/.../_apis/wit/workitems/{0}?api-version=5.0";
                string url= string.Format(baseUrl, attachments.Name);
                string url2= string.Format(baseUrl2, attachments.TicketNo);
                string msg1 = "Ticket created successfully!! Your Ticket ID is :{0}";
                string msg2 = "Ohh....Ticket creation  Failed !! Reson: {0}";
            var json = new StringContent(JsonConvert.SerializeObject(attachments.FileContent), Encoding.UTF8, "application/json-patch+json");
                try
                {
                   
                    using (HttpClient client = new HttpClient())
                    {
                        client.DefaultRequestHeaders.Accept.Add(
                            new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

                        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
                            Convert.ToBase64String(
                                System.Text.ASCIIEncoding.ASCII.GetBytes(
                                    string.Format("{0}:{1}", "", personalaccesstoken))));

                        using (HttpResponseMessage response = client.PostAsync(url,json).Result)
                        {
                            response.EnsureSuccessStatusCode();
                            string responseBody = response.Content.ReadAsStringAsync().Result;
                            JObject data = JObject.Parse(responseBody);
                            string result = Convert.ToString(data["url"]);
                            List<Root> atc = new List<Root>();
                            Root att = new Root();
                            Attributes at = new Attributes();
                            Value v = new Value();
                            at.comment = "Spec for the work";
                            v.rel = "AttachedFile";
                            v.url = result;
                            v.attributes = at;
                            att.op = "add";
                            att.path = "/relations/-";
                            att.value = v;
                            atc.Add(att);
                            json = new StringContent(JsonConvert.SerializeObject(atc), Encoding.UTF8, "application/json-patch+json");
                           // return responseBody;
                        }
                        using (HttpResponseMessage response = client.PatchAsync(url2, json).Result)
                        {
                            response.EnsureSuccessStatusCode();
                            string responseBody = response.Content.ReadAsStringAsync().Result;
                            JObject data = JObject.Parse(responseBody);
                            int result = Convert.ToInt32(data["id"]);
                            res.IsSuccess = true;
                            res.ticketID = result;
                            res.message = string.Format(msg1, result);
                            return res;
                        }

[file stored in devops ][1]

[Error Msg when downloaded and opened it][1]

Answer 1

问题出在您创建附件时传递给 client.PostAsync 方法的 json 主体。

您应该将文件读取为字节并构建 ByteArrayContent 而不是 StringContent。

我不知道上面 item 你的实例。但是当你创建附件时。首先，您需要将文件读取为字节数组。例如：

var bitArr = File.ReadAllBytes(@"C:\Test\UploadTemp\pic.png");

然后转换为ByteArrayContent。例如

var json = new ByteArrayContent(bitArr);
HttpResponseMessage response = client.PostAsync(url, json).Result;

请看下面的例子：

public string uploadAttachment() {
            
            #read the files as byteArray           
            var bitArr = File.ReadAllBytes(@"C:\Test\UploadTemp\pic.png");
                       
            using (HttpClient client = new HttpClient())
            {
                client.DefaultRequestHeaders.Accept.Add(
                    new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
                    Convert.ToBase64String(
                        System.Text.ASCIIEncoding.ASCII.GetBytes(
                            string.Format("{0}:{1}", "", personalaccesstoken))));
                
                var json = new ByteArrayContent(bitArr); ##convert to ByteArrayContent

                json.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                HttpResponseMessage response = client.PostAsync(url, json).Result;
                string responseBody = response.Content.ReadAsStringAsync().Result;
                JObject data = JObject.Parse(responseBody);
                string result = Convert.ToString(data["url"]);
                return result;

            }
}

我使用上面的代码创建了附件。并且从UI.

下载附件可以成功打开