我正在使用ASP.NET MVC 3
和Entity Framework code first CTP 5
。我想知道是否可以添加未映射到表列的其他属性?向实体框架添加其他属性4代码优先CTP 5实体
我haved一个新闻类,它的定义是这样的:
public class News : Entity
{
public int NewsId { get; set; }
public string Title { get; set; }
public string Body { get; set; }
public bool Active { get; set; }
}
我的数据库上下文类:
public class MyContext : DbContext
{
public DbSet<News> Newses { get; set; }
}
在实体类我有一个属性定义如下:
public IList<RuleViolation> RuleViolations { get; set; }
我还没有编码这部分,但我希望所有破碎的规则被添加到这个列表当对象我经验证。我正的错误是:
One or more validation errors were detected during model generation:
System.Data.Edm.EdmEntityType: : EntityType 'RuleViolation' has no key defined. Define the key for this EntityType.
System.Data.Edm.EdmEntitySet: EntityType: The EntitySet RuleViolations is based on type RuleViolation that has no keys defined.
这里是我的reposity代码:
public News FindById(int newsId)
{
return context.Database.SqlQuery<News>("News_FindById @NewsId",
new SqlParameter("NewsId", newsId)).FirstOrDefault();
}
更新2011-03-02:
这里是我Entity
类:
public class Entity
{
public IList<RuleViolation> RuleViolations { get; set; }
public bool Validate()
{
// Still needs to be coded
bool isValid = true;
return isValid;
}
}
这是我的RuleViolation
cl屁股:
public class RuleViolation
{
public RuleViolation(string parameterName, string errorMessage)
{
ParameterName = parameterName;
ErrorMessage = errorMessage;
}
public string ParameterName { get; set; }
public string ErrorMessage { get; set; }
}
这里是我的上下文类:
public class MyContext : DbContext
{
public DbSet<News> Newses { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<News>().Ignore(n => n.RuleViolations);
}
}
@David:我到底会把这段代码放在哪里? – 2011-03-01 14:36:34
@Brendan我用代码示例更新了答案。 – 2011-03-01 14:45:05
@David:谢谢你的扩展答案。我是否需要包含base.OnModelCreating(modelBuilder);?如果是这样,那么我需要在这段代码之前还是之后包含代码? – 2011-03-02 06:14:17