XAF ORMDataModel构建的基础资料对象无法被调用显示的解决办法

修正，其实只要在基础资料类中加入[XafDefaultProperty("名称")]标签即可。

namespace NEO.ERP.Module.BusinessObjects.Business
{
    //引用显示名称
    [XafDefaultProperty("名称")]
    public partial class 公共基础资料基类
    {
        public 公共基础资料基类(Session session) : base(session) { }


        public override void AfterConstruction()
        {
            base.AfterConstruction();
        }


    }

}

下面的是老的引用方法。

在Module项目中如果手工增加的XPO Business Object类，增加了[XafDefaultProperty("名称")]属性后,该对象被别的类调用就可以显示一个下拉列表。

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 HelloXAF.Module.BusinessObjects
{
    [DefaultClassOptions]
    //[ImageName("BO_Contact")]
    [XafDefaultProperty("名称")]
    //[DefaultListViewOptions(MasterDetailMode.ListViewOnly, false, NewItemRowPosition.None)]
    //[Persistent("DatabaseTableName")]
    // Specify more UI options using a declarative approach (https://documentation.devexpress.com/#eXpressAppFramework/CustomDocument112701).
    public class AAA : BaseObject
    { // Inherit from a different class to provide a custom primary key, concurrency and deletion behavior, etc. (https://documentation.devexpress.com/eXpressAppFramework/CustomDocument113146.aspx).
        public AAA(Session session)
            : base(session)
        {
        }
        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";
        //}

        public string 名称 { get; set; }

    }
}

AAA 列表显示 

汇率体系调用AAA时显示如下。

但是，当我们不是通过代码建BO对象时，而是通过ORMDataModel设计器来创建BO对象的时候。设计器创建的BO对象不是像手工建的BO像，设计器创建的对象不是派生于BaseObject，而是派生于XPObject。当我们给基础资料对象赋[XafDefaultProperty("Code")]属性的时候，发现引用该基础资料的下拉列表显示不出来Code或者Name。

网上搜索找到一篇文章。

https://www.devexpress.com/Support/Center/Question/Details/Q306912

原意是 Only the BaseObject class overrides the ToString method, to process the XafDefaultPropertyAttribute.

需要自己手工再处理Tostring()

找到需要被调用的基础资料类，

using System;
using DevExpress.Xpo;
using DevExpress.Data.Filtering;
using System.Collections.Generic;
using System.ComponentModel;
using DevExpress.Persistent.Base;
using DevExpress.ExpressApp.DC;
using DevExpress.ExpressApp;

namespace HelloXAF.Module.BusinessObjects.ORMDataModel_Base
{
    [DefaultClassOptions]
    [XafDefaultProperty("编码")]
    public partial class 币别
    {
        public 币别(Session session) : base(session) { }
        public override void AfterConstruction() { base.AfterConstruction(); }

        public override string ToString()
        {
            
            //if (!isDefaultPropertyAttributeInit)
            //{
                string defaultPropertyName = string.Empty;
                XafDefaultPropertyAttribute xafDefaultPropertyAttribute = XafTypesInfo.Instance.FindTypeInfo(GetType()).FindAttribute<XafDefaultPropertyAttribute>();
                if (xafDefaultPropertyAttribute != null)
                {
                    defaultPropertyName = xafDefaultPropertyAttribute.Name;
                }
                else
                {
                    DefaultPropertyAttribute defaultPropertyAttribute = XafTypesInfo.Instance.FindTypeInfo(GetType()).FindAttribute<DefaultPropertyAttribute>();
                    if (defaultPropertyAttribute != null)
                    {
                        defaultPropertyName = defaultPropertyAttribute.Name;
                    }
                }
                if (!string.IsNullOrEmpty(defaultPropertyName))
                {
                   var  defaultPropertyMemberInfo = ClassInfo.FindMember(defaultPropertyName);
                    object obj = defaultPropertyMemberInfo.GetValue(this);
                    if (obj != null)
                    {
                        return obj.ToString();
                    }
            }
                //isDefaultPropertyAttributeInit = true;
            //}
            //if (defaultPropertyMemberInfo != null)
            //{
            //    object obj = defaultPropertyMemberInfo.GetValue(this);
            //    if (obj != null)
            //    {
            //        return obj.ToString();
            //    }
            //}
            return base.ToString();
        }
    }

}

这样，设计器添加的基础资料也能显示出来了。