我在项目里面使用ef想对数据库操作在design.cs里面得到类

public partial class EventSetupRecordDataContext : System.Data.Linq.DataContext

有一个属性如下

public System.Data.Linq.Table<EventSetupRecord> EventSetupRecords
        {
            get
            {
                return this.GetTable<EventSetupRecord>();
            }
        }

我自己新建了一个项目里面 使用ef，design.cs的context类如下

public partial class dlinqEntities1 : ObjectContext
    {
        #region Constructors
    
        /// <summary>
        /// Initializes a new dlinqEntities1 object using the connection string found in the 'dlinqEntities1' section of the application configuration file.
        /// </summary>
        public dlinqEntities1() : base("name=dlinqEntities1", "dlinqEntities1")
        {
            this.ContextOptions.LazyLoadingEnabled = true;
            OnContextCreated();
        }
    然后会有一个返回一张表的属性entitytable

  public ObjectSet<entitytable> entitytable
        {
            get
            {
                if ((_entitytable == null))
                {
                    _entitytable = base.CreateObjectSet<entitytable>("entitytable");
                }
                return _entitytable;
            }
        }
        private ObjectSet<entitytable> _entitytable;

是什么造成这种不同的？还有属性返回的类型，还有类的父类有什么差异？