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。