使用ViewModel将数据从视图传递到控制器

我想用ViewModel将表单的数据从视图传递到控制器,这可能吗??我在发送数据时变为null。我的代码是:

我的ViewModel包含模型类引用。我想要传递的数据是两个模型的数据,即MasterSchoolInfo和MasterUserInfo,但是在提交控制器中的发布值时,显示了bull。这方面的任何帮助都将非常有用。我是Asp新手。Net MVC。

如果我将模型传递给控制器,那么工作正常,但一旦我将其更改为viewmodel,它就开始向控制器发送null。

从模型更改为ViewModel背后的想法是因为我想传递两个不同模型的数据,并在控制器中使用它们。

视图模型

namespace ABC.ViewModels
{
    public class UserInfoViewModel
    {
        public MasterSchoolInfo School { get; set; }
        public MasterTeacherInfo Teacher{ get; set; }
        public MasterStudentInfo Student { get; set; }
        public MasterParentInfo Parent { get; set; }
        public MasterUserInfo User { get; set; }
        public MasterUserRole Role { get; set; }

    }
}

控制器

[HttpPost]
public ContentResult CreateSchool(UserInfoViewModel _usrData)
{
    var content = string.Empty;
    if ((!String.IsNullOrEmpty(HttpContext.Session.GetString("UserEmail"))) && (!String.IsNullOrEmpty(HttpContext.Session.GetString("UserRole"))))
    {
        int UserId = Convert.ToInt32(HttpContext.Session.GetString("UserId"));
        string UserEmail = Convert.ToString(HttpContext.Session.GetString("UserEmail"));
        string UserRole = Convert.ToString(HttpContext.Session.GetString("UserRole"));
        byte[] salt = encryption.generatePasswordSalt("school");
        string password = encryption.generateHashedPassword("school", salt);
        if (UserRole == "Super Administrator")
        {
            _usrData.School.CreatedBy = UserEmail;
            _usrData.School.CreatedOn = DateTime.Now;
            _usrData.School.ApprovalStatus = true;
            _usrData.School.Status = true;
            MasterUserInfo userInfo = new MasterUserInfo();
            userInfo.RoleId = 4;
            userInfo.EmailId = _usrData.School.PrimaryEmailId;
            userInfo.Salt = Convert.ToBase64String(salt).ToString();
            userInfo.Password = password;
            userInfo.CreatedBy = UserEmail;
            userInfo.CreatedOn = DateTime.Now;
            userInfo.ApprovalStatus = true;
            userInfo.Status = true;
            //string[] str = schoolInfo.PrimaryEmailId.Split('.');
            //userInfo.Username = str[0].ToString();
            userInfo.Username = _usrData.User.Username.ToString();
            MasterSchoolInfo masterSchool = _context.Set<MasterSchoolInfo>().LastOrDefault();
            if (masterSchool != null)
            {
                var lastschoolcode = masterSchool.OpinschoolCode;                   
                var val = lastschoolcode.Substring(4, lastschoolcode.Length - 4);
                int r = Convert.ToInt32(val) + 1;
                string newusercode = "IESC000" + r;
                userInfo.UserCode = newusercode;
                _usrData.School.OpinschoolCode = newusercode;
            }
            else
            {
                string newusercode = "IESC000" + 1;
                userInfo.UserCode = newusercode;
                _usrData.School.OpinschoolCode = newusercode;
            }
            if (ModelState.IsValid)
            {

                _context.MasterUserInfo.Add(userInfo);
                _context.SaveChanges();

                MasterUserInfo masterUser = _context.Set<MasterUserInfo>().Last();
                _usrData.School.UserId = masterUser.Id;
                _context.MasterSchoolInfo.Add(_usrData.School);
                _context.SaveChanges();
                TempData["Message"] = "School Added Successfully!";
                content = "Success";
            }
            else
            {
                content = "Error";
            }
        }
        else
        {
            content = "Error";
        }
    }
    else
    {
        content = "Error";
    }
    return Content(content);
}