C# 使用HttpCilent请求接口，传递表单数据(可上传图片)

 //上传图片到服务器
            HttpClient client = new HttpClient();
            MultipartFormDataContent form = new MultipartFormDataContent();//表单
            StreamContent fileContent = new StreamContent(stream);//图片stream
            fileContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data");
            fileContent.Headers.ContentDisposition.FileName = System.DateTime.Now.ToString("yyyMMddHHmmss") + new Random().Next(1000, 9999) + ".jpg";
            form.Add(fileContent);
            string url = "http://" + authorizeModel.url + "/Login/UploadFile";//接口
            HttpResponseMessage res = await client.PostAsync(url, form);
            var result = await res.Content.ReadAsStringAsync();