无法将必填字段发布到数据库中

Question

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web;
using System.Web.Http;
using MvcApplication4.Models;

namespace MvcApplication4.Controllers
{
    public class DemoController : ApiController
    {
        private DemoEntities db = new DemoEntities();

        // GET api/Demo
        public IEnumerable<Emp_details> GetEmp_details()
        {
            return db.Emp_details.AsEnumerable();
        }

        // GET api/Demo/5
        public Emp_details GetEmp_details(int id)
        {
            Emp_details emp_details = db.Emp_details.Find(id);
            if (emp_details == null)
            {
                throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotFound));
            }

            return emp_details;
        }

        // PUT api/Demo/5
        public HttpResponseMessage PutEmp_details(int id, Emp_details emp_details)
        {
            if (!ModelState.IsValid)
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }

            if (id != emp_details.Id)
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }

            db.Entry(emp_details).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
            }

            return Request.CreateResponse(HttpStatusCode.OK);
        }

        // POST api/Demo
        public HttpResponseMessage PostEmp_details(Emp_details emp_details)
        {

            if (ModelState.IsValid)
            {
                //Emp_details empobject = new Emp_details();
                //empobject.Id = Convert.ToInt32(val[0]);
                //empobject.name = val[1];
                //empobject.Age = Convert.ToInt32(val[2]);
                db.Emp_details.Add(emp_details);
                db.SaveChanges();



                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, emp_details);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = emp_details }));
                return response;
            }
            else
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }
        }

        // DELETE api/Demo/5
        public HttpResponseMessage DeleteEmp_details(int id)
        {
            Emp_details emp_details = db.Emp_details.Find(id);
            if (emp_details == null)
            {
                return Request.CreateResponse(HttpStatusCode.NotFound);
            }

            db.Emp_details.Remove(emp_details);

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
            }

            return Request.CreateResponse(HttpStatusCode.OK, emp_details);
        }

        protected override void Dispose(bool disposing)
        {
            db.Dispose();
            base.Dispose(disposing);
        }
    }
}

I need to post only particular fields' values into the database not all the values. My database values contain Id , name , Age . I need to post only Id and name but not Age . Is that possible. Please help me out. and Also i need to post the values into different tables not to the single table.Please help me out fast i need a working code for this

Answer 1

create an object like :

var post_object = new Emp_details 
{
   id= "Updated ID",
   name = "Updated Name"
};

And post this object to your controller.You'll receive this object with Age set to it's default value(null if a Nullable type) and rest of the fields will have the new data/value(s).