‫ذخیره تنظیمات متغیر مربوط به یک وب اپلیکیشن ASP.NET MVC با استفاده از EF

1. ساخت یک Asp.net Web Application 
   
2. ساخت مدل Setting و افزودن آن به کانتکست Entity Framework 
   
3. ساخت کلاس SettingBase برای بازیابی و ذخیره سازی تنظیمات با رفلکشن
   
4. ساخت کلاس GenralSettins و SeoSettings که از کلاس SettingBase ارث بری کرده‌اند.
   
5. ساخت کلاس Settings به منظور مدیریت تمام انواع تنظیمات 

namespace DynamicSettingAPI.Models
{
    public interface IUnitOfWork
    {
        DbSet<Setting> Settings { get; set; }
        int SaveChanges();
    }
} 

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>,IUnitOfWork
    {
        public DbSet<Setting> Settings { get; set; }
        public ApplicationDbContext()
            : base("DefaultConnection", throwIfV1Schema: false)
        {
        }

        public static ApplicationDbContext Create()
        {
            return new ApplicationDbContext();
        }
    }


namespace DynamicSettingAPI.Models
{
    public class Setting
    {
        public string Name { get; set; }
        public string Type { get; set; }
        public string Value { get; set; }
    }
}

 protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Setting>()
                    .HasKey(x => new { x.Name, x.Type });

            modelBuilder.Entity<Setting>()
                        .Property(x => x.Value)
                        .IsOptional();

            base.OnModelCreating(modelBuilder);
        }

namespace DynamicSettingAPI.Service
{
    public abstract class SettingsBase
    {
        //1
        private readonly string _name;
        private readonly PropertyInfo[] _properties;

        protected SettingsBase()
        {
            //2
            var type = GetType();
            _name = type.Name;
            _properties = type.GetProperties();
        }

        public virtual void Load(IUnitOfWork unitOfWork)
        {
            //3 get setting for this type name
            var settings = unitOfWork.Settings.Where(w => w.Type == _name).ToList();

            foreach (var propertyInfo in _properties)
            {
                //get the setting from setting list
                var setting = settings.SingleOrDefault(s => s.Name == propertyInfo.Name);
                if (setting != null)
                {
                    //4 set 
                    propertyInfo.SetValue(this, Convert.ChangeType(setting.Value, propertyInfo.PropertyType));
                }
            }
        }
        public virtual void Save(IUnitOfWork unitOfWork)
        {
            //5 get all setting for this type name
            var settings = unitOfWork.Settings.Where(w => w.Type == _name).ToList();

            foreach (var propertyInfo in _properties)
            {
                var propertyValue = propertyInfo.GetValue(this, null);
                var value = (propertyValue == null) ? null : propertyValue.ToString();

                var setting = settings.SingleOrDefault(s => s.Name == propertyInfo.Name);
                if (setting != null)
                {
                    // 6 update existing value
                    setting.Value = value;
                }
                else
                {
                    // 7 create new setting
                    var newSetting = new Setting()
                    {
                        Name = propertyInfo.Name,
                        Type = _name,
                        Value = value,
                    };
                    unitOfWork.Settings.Add(newSetting);
                }
            }
        }
    }
}

propertyInfo.SetValue(this, Convert.ChangeType(setting.Value, propertyInfo.PropertyType));