使用EntityTypeConfiguration< T>时抽象域模型基类 [英] Abstract domain model base class when using EntityTypeConfiguration<T>
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问题描述
当使用EntityTypeConfiguration时，抽象类有一些简单的模式。
非常感谢任何提示。
我无法声明一个类
公共类BaseEntityConfig< T> ：EntityTypeConfiguration< T>
类似的问题，我无法得到工作答案
如何创建和使用通用类EntityTypeConfiguration< TEntity>
和
生成EntityTypeConfiguration的动态方式：类型TResult必须是不可为空的值类型
public abstract class BosBaseObject
{
public virtual Guid Id {set;得到; }
public virtual string ExternalKey {set;得到; }
public byte [] RowVersion {get;组; }
}
public class新闻：BosBaseObject
{
public String Heading {set;得到; }
}
public class NewsMap：EntityTypeConfiguration< News>
{
public NewsMap（）
{
// Base Object Common Mappings
//我们如何使用所有基本抽象属性的中央映射
}
}
//这样的东西，但对任何建议都很开放....
public class BosBaseEntityConfig< T> ：EntityTypeConfiguration< T>
{
public void BaseObjectMap（）
{
//主键
this.HasKey（t => t.Id）;
//属性
this.Property（t => t.Id）.HasDatabaseGeneratedOption（databaseGeneratedOption：DatabaseGeneratedOption.None）;
this.Property（t => t.RowVersion）
.IsRequired（）
.IsFixedLength（）
.HasMaxLength（8）
。 IsRowVersion（）;
//列映射
this.Property（t => t.Id）.HasColumnName（Id）;
}
}
解决方案
之后6小时我破解了我认为这是一个相当干净的结果。
诀窍是忘记从EntityTypeConfiguration
派生的类中的每个内部，并构建一个自定义BaseConfig，然后获取此实例并添加此类的具体信息。希望它帮助别人首先使用抽象...
public abstract class BosBaseObject
{
public虚拟Guid Id {set;得到; }
public virtual string ExternalKey {set;得到; }
public byte [] RowVersion {get;组; }
}
public abstract class BosObjectDateManaged：BosBaseObject
{
public DateTimeOffset ValidFrom {set;得到; }
public DateTimeOffset ValidTo {set;得到;
}
public class新闻：BosObjectDateManaged
{
public String标题{set;得到;
protected override void OnModelCreating（DbModelBuilder modelBuilder）
{
var conf = new BosBaseEntityConfiguration< News>（）; //为Type
构造配置modelBuilder.Configurations.Add（conf）; //这里现在有基础映射
var newsConf = new NewsConfiguration（conf）; //现在对象的特定属性东西
}
}
public class BosBaseEntityConfiguration< T> ：EntityTypeConfiguration< T>其中T：BosBaseObject
{
public BosBaseEntityConfiguration（）
{
//主键
this.HasKey（t => t.Id）;
////属性
this.Property（t => t.Id）.HasDatabaseGeneratedOption（databaseGeneratedOption：DatabaseGeneratedOption.None）;
this.Property（t => t.RowVersion）
.IsRequired（）
.IsFixedLength（）
.HasMaxLength（8）
。 IsRowVersion（）;
//列映射
this.Property（t => t.Id）.HasColumnName（Id）;
}
}
public class NewsConfiguration
{
public NewsConfiguration（BosBaseEntityConfiguration< News> entity）
{
// Table Specific&列映射
entity.ToTable（News2）;
entity.Property（t => t.Heading）.HasColumnName（Heading2）;
}
}
Is there some trick to getting a central mapping of Base object properties?
Is there some simple pattern for abstract classes when using EntityTypeConfiguration.
ANy tips much appreciated.
Im unable to declare a class
Public class BaseEntityConfig<T> : EntityTypeConfiguration<T>
Similar issues, where i couldnt get the answers to work How to create and use a generic class EntityTypeConfiguration<TEntity> and Dynamic way to Generate EntityTypeConfiguration : The type 'TResult' must be a non-nullable value type
public abstract class BosBaseObject
{
public virtual Guid Id { set; get; }
public virtual string ExternalKey { set; get; }
public byte[] RowVersion { get; set; }
}
public class News : BosBaseObject
{
public String Heading { set; get; }
}
public class NewsMap : EntityTypeConfiguration<News>
{
public NewsMap()
{
//Base Object Common Mappings
// How can we use a central mapping for all Base Abstract properties
}
}
// Something like this but very open to any suggestion....
public class BosBaseEntityConfig<T> : EntityTypeConfiguration<T>
{
public void BaseObjectMap( )
{
// Primary Key
this.HasKey(t => t.Id);
// Properties
this.Property(t => t.Id).HasDatabaseGeneratedOption(databaseGeneratedOption: DatabaseGeneratedOption.None);
this.Property(t => t.RowVersion)
.IsRequired()
.IsFixedLength()
.HasMaxLength(8)
.IsRowVersion();
//Column Mappings
this.Property(t => t.Id).HasColumnName("Id");
}
}
解决方案
After 6 hrs I cracked it. I think it is a reasonably clean outcome. The trick is to forget doing every inside a class derived from EntityTypeConfiguration and build a custom BaseConfig and then to take this instance and add the specifics for this class. Hope it helps others doing code first with abstracts...
public abstract class BosBaseObject
{
public virtual Guid Id { set; get; }
public virtual string ExternalKey { set; get; }
public byte[] RowVersion { get; set; }
}
public abstract class BosObjectDateManaged : BosBaseObject
{
public DateTimeOffset ValidFrom { set; get; }
public DateTimeOffset ValidTo { set; get; }
}
public class News : BosObjectDateManaged
{
public String Heading { set; get; }
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
var conf = new BosBaseEntityConfiguration<News>();//Construct config for Type
modelBuilder.Configurations.Add( conf ); // this has base mapping now
var newsConf = new NewsConfiguration(conf); // now the Object specific properties stuff
}
}
public class BosBaseEntityConfiguration<T> : EntityTypeConfiguration<T> where T : BosBaseObject
{
public BosBaseEntityConfiguration()
{
// Primary Key
this.HasKey(t => t.Id);
//// Properties
this.Property(t => t.Id).HasDatabaseGeneratedOption(databaseGeneratedOption: DatabaseGeneratedOption.None);
this.Property(t => t.RowVersion)
.IsRequired()
.IsFixedLength()
.HasMaxLength(8)
.IsRowVersion();
//Column Mappings
this.Property(t => t.Id).HasColumnName("Id");
}
}
public class NewsConfiguration
{
public NewsConfiguration(BosBaseEntityConfiguration<News> entity)
{
// Table Specific & Column Mappings
entity.ToTable("News2");
entity.Property(t => t.Heading).HasColumnName("Heading2");
}
}
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