别人的水果管理基类

using System;
using System.Linq;
using System.Text;
using DevExpress.Xpo;
using DevExpress.ExpressApp;
using System.ComponentModel;
using DevExpress.ExpressApp.DC;
using DevExpress.Data.Filtering;
using DevExpress.Persistent.Base;
using System.Collections.Generic;
using DevExpress.ExpressApp.Model;
using DevExpress.Persistent.BaseImpl;
using DevExpress.Persistent.Validation;

namespace BKYDemo.Module.BusinessObjects
{
    [DefaultClassOptions]
    //[ImageName("BO_Contact")]
    //[DefaultProperty("DisplayMemberNameForLookupEditorsOfThisType")]
    //[DefaultListViewOptions(MasterDetailMode.ListViewOnly, false, NewItemRowPosition.None)]
    //[Persistent("DatabaseTableName")]
    // Specify more UI options using a declarative approach (https://documentation.devexpress.com/#eXpressAppFramework/CustomDocument112701).

    [XafDisplayName("水果基类")]
    //什么意思了??
    [NonPersistent]

    public class FruitsBase : XPBaseObject
    { 
        // Inherit from a different class to provide a custom primary key, concurrency and deletion behavior, etc. (https://documentation.devexpress.com/eXpressAppFramework/CustomDocument113146.aspx).
        public FruitsBase(Session session) : base(session)
        {
        }

        [XafDisplayName("自增ID")]
        [Key(AutoGenerate = true), Browsable(false)]
        public int GID {
            get {
                return GetPropertyValue<int>(nameof(GID));
            }
            set
            {
                SetDelayedPropertyValue(nameof(GID), value);
            }

        }

        [XafDisplayName("水果编号")]
        public string Code {
            get {
                return GetPropertyValue<string>(nameof(Code));
            }
            set {
                SetDelayedPropertyValue(nameof(Code), value);
            }
        }

        [XafDisplayName("水果名称")]
        //为空判断
        [RuleRequiredField("RuleRequiredFiled.FruitsBase.Name", DefaultContexts.Save, "名称不能为空")]
        public string Name {
            get {
                return GetPropertyValue<string>(nameof(Name));
            }
            set {
                SetPropertyValue(nameof(Name),value);
            }
        }

        [XafDisplayName("水果种类")]
        public EnumFruitType Type
        {
            get
            {
                return GetPropertyValue<EnumFruitType>(nameof(Type));
            }
            set
            {
                SetPropertyValue(nameof(Type), value);
            }
        }

        /// <summary>
        /// 水果种类
        /// </summary>
        public enum EnumFruitType
        {
            [XafDisplayName("苹果")]
            One = 1,
            [XafDisplayName("香蕉")]
            Two = 2,
            [XafDisplayName("葡萄")]
            Three = 3,
            [XafDisplayName("火龙果")]
            Four = 4,
            [XafDisplayName("龙眼")]
            Five = 5,
        }


        [XafDisplayName("水果介绍"),Size(2000)]
        //文件大小给了2000kb
        public string Desc
        {
            get
            {
                return GetPropertyValue<string>(nameof(Desc));
            }
            set
            {
                SetPropertyValue(nameof(Desc), value);
            }
        }


        [XafDisplayName("水果图片")]
        [ImageEditor(ImageEditorMode.PopupPictureEdit,ImageEditorMode.PictureEdit)]
        //图片可编辑？
        public byte[] ImageData
        {
            get
            {
                return GetPropertyValue<byte[]>(nameof(ImageData));
            }
            set
            {
                SetPropertyValue(nameof(ImageData), value);
            }
        }

        [XafDisplayName("水果产地")]
        public string Place
        {
            get
            {
                return GetPropertyValue<string>(nameof(Place));
            }
            set
            {
                SetPropertyValue(nameof(Place), value);
            }
        }

        [XafDisplayName("创建人")]
        public string Creater
        {
            get
            {
                return GetPropertyValue<string>(nameof(Creater));
            }
            set
            {
                SetPropertyValue(nameof(Creater), value);
            }
        }

        [XafDisplayName("创建时间")]
        public DateTime CreateTime
        {
            get
            {
                return GetPropertyValue<DateTime>(nameof(CreateTime));
            }
            set
            {
                SetPropertyValue(nameof(CreateTime), value);
            }
        }

        [XafDisplayName("推荐价格")]
        public decimal Price
        {
            get
            {
                return GetPropertyValue<decimal>(nameof(Price));
            }
            set
            {
                SetPropertyValue(nameof(Price), value);
            }
        }

        



        public override void AfterConstruction()
        {
            base.AfterConstruction();
            // Place your initialization code here (https://documentation.devexpress.com/eXpressAppFramework/CustomDocument112834.aspx).
        }
        //private string _PersistentProperty;
        //[XafDisplayName("My display name"), ToolTip("My hint message")]
        //[ModelDefault("EditMask", "(000)-00"), Index(0), VisibleInListView(false)]
        //[Persistent("DatabaseColumnName"), RuleRequiredField(DefaultContexts.Save)]
        //public string PersistentProperty {
        //    get { return _PersistentProperty; }
        //    set { SetPropertyValue("PersistentProperty", ref _PersistentProperty, value); }
        //}

        //[Action(Caption = "My UI Action", ConfirmationMessage = "Are you sure?", ImageName = "Attention", AutoCommit = true)]
        //public void ActionMethod() {
        //    // Trigger a custom business logic for the current record in the UI (https://documentation.devexpress.com/eXpressAppFramework/CustomDocument112619.aspx).
        //    this.PersistentProperty = "Paid";
        //}
    }
}

原文地址：XAF框架学习：如何创建业务实体类和菜单页面视图布局 - 小小邪 - 博客园 (cnblogs.com)