Linq问题：自动生成的实体类中那些代码是无用的？（一般用不到的代码）

 把没用的帮我去掉就可以了，另外，除了SQLMetal外，有没有什么图形化的工具可以将这些Atrribute写到XML文件中？
 [Table(Name = "dbo.[Order Details]")]
    public partial class Order_Details : INotifyPropertyChanging, INotifyPropertyChanged
    {        private static PropertyChangingEventArgs emptyChangingEventArgs = new PropertyChangingEventArgs(String.Empty);        private int _OrderID;        private int _ProductID;        private decimal _UnitPrice;        private short _Quantity;        private float _Discount;        private EntityRef<Orders> _Orders;        private EntityRef<Products> _Products;        #region Extensibility Method Definitions
        partial void OnLoaded();
        partial void OnValidate(System.Data.Linq.ChangeAction action);
        partial void OnCreated();
        partial void OnOrderIDChanging(int value);
        partial void OnOrderIDChanged();
        partial void OnProductIDChanging(int value);
        partial void OnProductIDChanged();
        partial void OnUnitPriceChanging(decimal value);
        partial void OnUnitPriceChanged();
        partial void OnQuantityChanging(short value);
        partial void OnQuantityChanged();
        partial void OnDiscountChanging(float value);
        partial void OnDiscountChanged();
        #endregion        public Order_Details()
        {
            this._Orders = default(EntityRef<Orders>);
            this._Products = default(EntityRef<Products>);
            OnCreated();
        }        [Column(Storage = "_OrderID", DbType = "Int NOT NULL", IsPrimaryKey = true)]
        public int OrderID
        {
            get
            {
                return this._OrderID;
            }
            set
            {
                if ((this._OrderID != value))
                {
                    if (this._Orders.HasLoadedOrAssignedValue)
                    {
                        throw new System.Data.Linq.ForeignKeyReferenceAlreadyHasValueException();
                    }
                    this.OnOrderIDChanging(value);
                    this.SendPropertyChanging();
                    this._OrderID = value;
                    this.SendPropertyChanged("OrderID");
                    this.OnOrderIDChanged();
                }
            }
        }        [Column(Storage = "_ProductID", DbType = "Int NOT NULL", IsPrimaryKey = true)]
        public int ProductID
        {
            get
            {
                return this._ProductID;
            }
            set
            {
                if ((this._ProductID != value))
                {
                    if (this._Products.HasLoadedOrAssignedValue)
                    {
                        throw new System.Data.Linq.ForeignKeyReferenceAlreadyHasValueException();
                    }
                    this.OnProductIDChanging(value);
                    this.SendPropertyChanging();
                    this._ProductID = value;
                    this.SendPropertyChanged("ProductID");
                    this.OnProductIDChanged();
                }
            }
        }        [Column(Storage = "_UnitPrice", DbType = "Money NOT NULL")]
        public decimal UnitPrice
        {
            get
            {
                return this._UnitPrice;
            }
            set
            {
                if ((this._UnitPrice != value))
                {
                    this.OnUnitPriceChanging(value);
                    this.SendPropertyChanging();
                    this._UnitPrice = value;
                    this.SendPropertyChanged("UnitPrice");
                    this.OnUnitPriceChanged();
                }
            }
        }        [Column(Storage = "_Quantity", DbType = "SmallInt NOT NULL")]
        public short Quantity
        {
            get
            {
                return this._Quantity;
            }
            set
            {
                if ((this._Quantity != value))
                {
                    this.OnQuantityChanging(value);
                    this.SendPropertyChanging();
                    this._Quantity = value;
                    this.SendPropertyChanged("Quantity");
                    this.OnQuantityChanged();
                }
            }
        }        [Column(Storage = "_Discount", DbType = "Real NOT NULL")]
        public float Discount
        {
            get
            {
                return this._Discount;
            }
            set
            {
                if ((this._Discount != value))
                {
                    this.OnDiscountChanging(value);
                    this.SendPropertyChanging();
                    this._Discount = value;
                    this.SendPropertyChanged("Discount");
                    this.OnDiscountChanged();
                }
            }
        }