Object属性具有正确的值，但不填充数据库中的相应字段

Question

大家好，感谢您花时间看我的问题。

我是asp.net MVC和EntityFramework中的新手，因为我从另一个人那里获得了一个项目，而且是在这个技术中。

我的问题是我想添加在客户端对象中存储客户端坐标的可能性。我在我的Client类中添加了Lat和Lng属性，它位于：

    //------------------------------------------------------------------------------
// <auto-generated>
//     Ce code a été généré à partir d'un modèle.
//
//     Des modifications manuelles apportées à ce fichier peuvent conduire à un comportement inattendu de votre application.
//     Les modifications manuelles apportées à ce fichier sont remplacées si le code est régénéré.
// </auto-generated>
//------------------------------------------------------------------------------

namespace Uphair.EfModel
{
    using System;
    using System.Collections.Generic;

    public partial class Client
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public Client()
        {
            this.Cards = new HashSet<Card>();
            this.NoteClientPartenaires = new HashSet<NoteClientPartenaire>();
            this.Notifications = new HashSet<Notification>();
            this.Discussions = new HashSet<Discussion>();
            this.Reservations = new HashSet<Reservation>();
        }

        public int IdClient { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public Nullable<System.DateTime> DateNaissance { get; set; }
        public string Email { get; set; }
        public string Password { get; set; }
        public string PasswordSalt { get; set; }
        public string FacebookUid { get; set; }
        public string ImageUrl { get; set; }
        public Nullable<System.DateTime> DateAjout { get; set; }
        public GenreType Genre { get; set; }
        public string IdUserMngo { get; set; }
        public string Pays { get; set; }
        public string Ville { get; set; }
        public string Adresse { get; set; }
        public string CodePostal { get; set; }
        public string TelMobile { get; set; }
        public bool Valide { get; set; }
        public bool Son { get; set; }
        public bool Push { get; set; }
        public string IdPhone { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Card> Cards { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<NoteClientPartenaire> NoteClientPartenaires { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Notification> Notifications { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Discussion> Discussions { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Reservation> Reservations { get; set; }
        public Nullable<double> Lat { get; set; }
        public Nullable<double> Lng { get; set; }
    }
}

我还手动将字段Lat和Lng（都是double）添加到我的数据库中的Client表和我的edmx文件中的Client实体。这是来自edmx的我的客户实体：

<EntityType Name="Client">
          <Key>
            <PropertyRef Name="IdClient" />
          </Key>
          <Property Name="IdClient" Type="int" StoreGeneratedPattern="Identity" Nullable="false" />
          <Property Name="FirstName" Type="varchar" MaxLength="255" />
          <Property Name="LastName" Type="varchar" MaxLength="255" />
          <Property Name="DateNaissance" Type="datetime" Precision="0" />
          <Property Name="Email" Type="varchar" MaxLength="255" />
          <Property Name="Password" Type="varchar" MaxLength="255" />
          <Property Name="PasswordSalt" Type="varchar" MaxLength="255" />
          <Property Name="FacebookUid" Type="varchar" MaxLength="255" />
          <Property Name="ImageUrl" Type="varchar" MaxLength="255" />
          <Property Name="DateAjout" Type="datetime" Precision="0" />
          <Property Name="Genre" Type="int" Nullable="false" />
          <Property Name="IdUserMngo" Type="varchar" MaxLength="255" />
          <Property Name="Pays" Type="varchar" MaxLength="255" />
          <Property Name="Ville" Type="varchar" MaxLength="255" />
          <Property Name="Adresse" Type="varchar" MaxLength="500" />
          <Property Name="CodePostal" Type="varchar" MaxLength="50" />
          <Property Name="TelMobile" Type="varchar" MaxLength="50" />
          <Property Name="Valide" Type="bool" Nullable="false" />
          <Property Name="Son" Type="bool" Nullable="false" />
          <Property Name="Push" Type="bool" Nullable="false" />
          <Property Name="IdPhone" Type="varchar" MaxLength="255" />
          <Property Name="Lat" Type="double" />
          <Property Name="Lng" Type="double" />
        </EntityType>

当我显示在控制器动作结束时返回的对象时，它已经很好地填充并且其中包含正确的数据。但我的数据库中的字段始终为NULL。

这是来自ClientController的我的动作方法：

public IHttpActionResult PostClient(Inscription model)
        {
            if (model == null)
            {
                return BadRequest("Paramètres obligatoire");
            }

            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState.Errors()?.FirstOrDefault());
            }

            //Email existant
            if (db.Clients.FirstOrDefault(x => x.Email.Equals(model.Email, StringComparison.InvariantCultureIgnoreCase))
                != null)
            {
                return BadRequest(UphairResources.EmailAlreadyExist);
            }

            string url = @"https://maps.googleapis.com/maps/api/geocode/json";

            RestClient clientRest = new RestClient(url);
            RestRequest request = new RestRequest();
            request.AddParameter("address",
                "" + model.Ville + "+" + model.Adresse + "+" + model.CodePostal);

            var result = clientRest.Execute<ResultAdress>(request);

            if (result.Data.status != "OK")
            {
                return BadRequest("Aucune correspondance n'a été trouvée pour votre adresse postale, vérifiez-là.");
            }

            var client = new Client
            {
                Email = model.Email,
                FirstName = model.Prenom,
                LastName = model.Nom,
                Genre = model.Genre,
                DateAjout = DateTime.Now,
                Valide = true,
                ImageUrl = "https://res.cloudinary.com/**********/image/upload/v1509641859/profile_oqcfnd_zey6xm.png",
                TelMobile = model.TelMobile,
                Adresse = model.Adresse,
                Ville = model.Ville,
                CodePostal = model.CodePostal,
                Pays = "France"
            };

            client.Lat = result.Data.results.FirstOrDefault()?.geometry.location.lat;
            client.Lng = result.Data.results.FirstOrDefault()?.geometry.location.lng;

            var crypto = new SimpleCrypto.PBKDF2 { HashIterations = 10000 };

            crypto.Compute(model.Password);

            client.Password = crypto.HashedText;
            client.PasswordSalt = crypto.Salt;

            //Add client a Save  
            db.Clients.Add(client);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = client.IdClient }, client); // Here client has the correct data in Client.Lat and Client.Lng
        }

提前感谢您的支持：）