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OEA体验 :元数据编写

一、摘要

       我下面写的是我在使用OEA中用到的功能,当然还有好多现在还没有用到,以后我会慢慢完善这篇文章。

OEA 源码:OpenExpressApp:OEA框架 2.9 Pre-Alpha 源码公布 可以到周哥的博客中可以下到。

二、本文大纲

       a、摘要。

       b、配置数据库。

       c、元数据结构。

       d、元数据事件。

       e、界面配置。

       f、数据编辑。

       j、编辑器。

三、配置数据库:

配置文件

1:  <connectionStrings>
2:        <add name="DbMigrationHistory" connectionString="Data Source=LUOMG-PC;Initial Catalog=DbMigrationHistory;User ID=sa;Password=123456" providerName="System.Data.SqlClient" />
3:        <add name="OEA" connectionString="Data Source=LUOMG-PC;Initial Catalog=OEA;User ID=sa;Password=123456" providerName="System.Data.SqlClient" />
4:        <add name="Demo" connectionString="Data Source=LUOMG-PC;Initial Catalog=Demo;User ID=sa;Password=123456" providerName="System.Data.SqlClient" />
5:      </connectionStrings>
6:  

实现代码

 1:  [Serializable]
 2:     public abstract class DemoEntity : Entity
 3:     {
 4:         public static readonly string ConnectionString = "Demo";
 5:   
 6:         protected override string ConnectionStringSettingName
 7:         {
 8:             get { return ConnectionString; }
 9:         }
10:     }
11:   
四、元数据结构:

这里的代码以后都是自动生成了。

1:  public static readonly Property<int> CcGongredayProperty = P<Chargeannual>.Register(e => e.CcGongreday);
2:         publicint CcGongreday 
3:         { 
4:             get { return this.GetProperty(CcGongredayProperty); } 
5:             set { this.SetProperty(CcGongredayProperty, value); } 
6:         }
7:   

数据库会跟着换类型的,除非里面的数据不能转换为目标类型。
但是界面跟数据库是没什么关系的,主要还是跟实体类有关系。

实体类是日期型的,界面应该是日期型控件。

五、元数据事件:

在这里要实现的效果是

image 当用户选择供热结束时间自动计算供热天数,代码如下:

 1:  publicstaticreadonly ManagedProperty<DateTime> CcGongreendProperty = P<Chargeannual>.Register(e => e.CcGongreend, new PropertyMetadata<DateTime> 
 2:          {
 3:              PropertyChangedCallBack = (o, e) => (o as Chargeannual).OnCcGongreendChanged(e),
 4:          });
 5:  protected virtual void OnCcGongreendChanged(ManagedPropertyChangedEventArgs<DateTime> e)
 6:          {
 7:   
 8:              //  在这里实现业务
 9:  
10:              // TimeSpan ts = CcGongreend - CcGongrebegin;
11:              // this.CcGongreday = ts.Days;
12:          }
13:   
六、界面配置:

image

要实现界面属性自动管理,需要编写如下代码:

 

 

 

 1:  internal class ChargeannualConfig : EntityConfig<Chargeannual>
 2:  {
 3:      protected override void ConfigMeta()
 4:      {
 5:          base.ConfigMeta();
 6:          Meta.MapTable().HasColumns(
 7:          Chargeannual.CcYearProperty,
 8:          Chargeannual.CcSwitchProperty,
 9:          Chargeannual.CcGongrebeginProperty,
10:          Chargeannual.CcGongreendProperty,
11:          Chargeannual.CcGongredayProperty,
12:          Chargeannual.CcDnabeginProperty,
13:          Chargeannual.CcDnaproportionProperty,
14:          Chargeannual.CcStopportionProperty,
15:          Chargeannual.CcFixedportionProperty,
16:          Chargeannual.CcGongjianProperty,
17:          Chargeannual.CcResidentProperty,
18:          Chargeannual.CcDishangProperty,
19:          Chargeannual.CcGongjian1Property,
20:          Chargeannual.CcResident1Property,
21:          Chargeannual.CcDishang1Property,
22:          Chargeannual.CcDateProperty
23:              );
24:      }
25:  }
26:   
27:   
28:   
七、数据编辑:

image

要实现界面编辑,需要编写如下代码,当然你也可以直接在空格中进行编辑。

 1:  internal class ChargeannualConfig : EntityConfig<Chargeannual>
 2:  {
 3:      protected override void ConfigView()
 4:      {
 5:          base.ConfigView();
 6:          View.Property(Chargeannual.CcYearProperty).HasLabel("收?费?年ê度è").ShowIn(ShowInWhere.Detail);
 7:          View.Property(Chargeannual.CcSwitchProperty).HasLabel("开a关?设è置?").ShowIn(ShowInWhere.Detail);
 8:          View.Property(Chargeannual.CcGongrebeginProperty).HasLabel("供?热è开a始?时±间?").ShowIn(ShowInWhere.Detail);
 9:          View.Property(Chargeannual.CcGongreendProperty).HasLabel("供?热è结á束?时±间?").ShowIn(ShowInWhere.Detail);
10:          View.Property(Chargeannual.CcGongredayProperty).HasLabel("供?热è天ì数y").ShowIn(ShowInWhere.Detail);
11:          View.Property(Chargeannual.CcDnabeginProperty).HasLabel("缔T纳é开a始?日?期ú").ShowIn(ShowInWhere.Detail);
12:          View.Property(Chargeannual.CcDnaproportionProperty).HasLabel("缔T纳é金e比è例y").ShowIn(ShowInWhere.Detail);
13:          View.Property(Chargeannual.CcStopportionProperty).HasLabel("停£热è基ù础?费?比è例y").ShowIn(ShowInWhere.Detail);
14:          View.Property(Chargeannual.CcFixedportionProperty).HasLabel("固ì定¨热è费?比è例y").ShowIn(ShowInWhere.Detail);
15:          View.Property(Chargeannual.CcGongjianProperty).HasLabel("公?建¨").ShowIn(ShowInWhere.Detail);
16:          View.Property(Chargeannual.CcResidentProperty).HasLabel("居ó民?").ShowIn(ShowInWhere.Detail);
17:          View.Property(Chargeannual.CcDishangProperty).HasLabel("底×商ì").ShowIn(ShowInWhere.Detail);
18:          View.Property(Chargeannual.CcGongjian1Property).HasLabel("公?建¨1").ShowIn(ShowInWhere.Detail);
19:          View.Property(Chargeannual.CcResident1Property).HasLabel("居ó民?1").ShowIn(ShowInWhere.Detail);
20:          View.Property(Chargeannual.CcDishang1Property).HasLabel("底×商ì1").ShowIn(ShowInWhere.Detail);
21:          View.Property(Chargeannual.CcDateProperty).HasLabel("CcDate").ShowIn(ShowInWhere.Detail);
22:   
23:      }
24:  }
25:   
八、编辑器:

image

internal class ClientinfoConfig : EntityConfig<Clientinfo> 类中的protected override void ConfigView()加入如下代码

1:  View.Property(Clientinfo.CcVillageProperty).HasLabel("街?道à小?区?").ShowIn(ShowInWhere.Detail).UseEditor(WPFEditorNames.Memo);
2:   
Clientinfo.CcVillageProperty==类.属性
在这里需要注意的是属性必须是string(字符串类型),要不然系统会报错。
目前只支持大文本编辑其它的编辑器太多了做不完,所以我们在程序级别支持开发人员自定义自己的属性编辑器。
 
其他:

ManagedPropertyChangedSource.FromProperty 是什么意思?
e.Source 表示属性被变更是哪里引起的。
FromPresistence 表示这个属性正在被数据层设置。
FromUI 表示界面。

posted @ 2012-04-03 22:53  峡谷少爷  阅读(1571)  评论(0编辑  收藏  举报