上传照片并将其作为json对象发送

Question

我正在使用视图上传照片,然后我在控制器中收到它 HttpPostedFileBase

然后我发送它在一个Http请求,事情很好,但当我收到json对象中的http请求时,照片为null

这是请求:

 public ActionResult RegisterUsersCheck(User_all_data user_data)
        {
            var webAddr = "http://localhost:59305/api/User/RegisterUsersCheck";
            var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
            httpWebRequest.ContentType = "application/json; charset=utf-8";
            httpWebRequest.Accept = "application/json";
            httpWebRequest.Method = "POST";
            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                string json = "{ user : { 'FirstName':'" + user_data.user.FirstName +
                    "','LastName': '" + user_data.user.LastName + "','Email': '" + user_data.user.Email +
                    "','Password': '" + user_data.user.Password + "','Country': '" + user_data.user.Country +
                    "','PhoneNumber': '" + user_data.ProfilePicture +
                    "'},'ProfilePicture': '" + user_data.PhoneNumber + "'}";
                streamWriter.Write(json);
                streamWriter.Flush();
            }

            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {

                var result = streamReader.ReadToEnd();
                return RedirectToAction("Index");
            }

这是我收到请求的方式

public bool RegisterUsersCheck ([FromBody] User_all_data user_ext)
        {
            List<User> all_users = repo.getUsers();
            var match = all_users.Find(i => i.Email == user_ext.user.Email);
            if (match == null)
            {
                RegisterUsers(user_ext);
                return true;
            }
            else
            {
                return false;
            }
        }

这是User_all_data班级

public class User_all_data
        {
            public User user { get; set; }
            public HttpPostedFileBase ProfilePicture { get; set; }
        }

正如我之前提到的那样,发送很好,但是当我收到请求时,它ProfilePicture是空的

Answer 1

好吧,首先,在这段代码中

string json = "{ user : { 'FirstName':'" + user_data.user.FirstName +
                "','LastName': '" + user_data.user.LastName + "','Email': '" + user_data.user.Email +
                "','Password': '" + user_data.user.Password + "','Country': '" + user_data.user.Country +
                "','PhoneNumber': '" + user_data.ProfilePicture +
                "'},'ProfilePicture': '" + user_data.PhoneNumber + "'}";

它看起来像键PhoneNumber并被ProfilePicture交换.你正在设置PhoneNumber成为ProfilePicture和将ProfilePicture成为PhoneNumber.它应该是相反的方式.

此外,我不确定什么数据类型user_data.ProfilePicture,但如果它是一个图像,你不能只是把它塞进JSON.JSON不支持像图像这样的二进制数据.一种选择是在将图像数据放入JSON之前对其进行base64编码.这是一个这样做的例子:

byte[] imageBytes = ...
var imageBytesStr = Convert.ToBase64String(imageBytes);

然后,在构建JSON时,将ProfilePicture键设置为base64编码的字符串imageBytesStr.然后,您的客户端必须对ProfilePicture字符串进行base64解码才能获得图像字节.然后客户端必须从这些字节构造一个图像.