EF4 和 UnitOfWork - 如何使自定义属性发挥作用
假设我有：
public class A
{
public virtual int Id { get; set; }
}
public class ARepository
{
private SomeContext _context;
public ARepository(IUnitOfWork unitOfWork)
{
_context = unitOfWork;
}
public A GetAById(int aId)
{
return _context.A.Where(o => o.Id == aId).SingleOrDefault();
}
}
public class B
{
public virtual int Id { get; set; }
public virtual Category Category { get ; set; } //enum with NEW and OLD values
public virtual int Quantity { get; set; }
}
public class BRepository
{
private SomeContext _context;
public BRepository(IUnitOfWork unitOfWork)
{
_context = unitOfWork;
}
public B GetBById(int bId)
{
return _context.B.Where(o => o.Id == bId).SingleOrDefault();
}
}
并且我正在使用实体框架（首先是 4.1 代码）。
例如，我将如何在 A 类中实现自定义属性，例如：
//returns the total of all B objects in the context where the category is NEW
public int NewBTotals
{
}
并且不必创建上下文？
希望我的问题足够清楚，如果不是，请告诉我，我会尝试更详细地描述我想要实现的目标（时间不够了）。
Say I have:
public class A
{
public virtual int Id { get; set; }
}
public class ARepository
{
private SomeContext _context;
public ARepository(IUnitOfWork unitOfWork)
{
_context = unitOfWork;
}
public A GetAById(int aId)
{
return _context.A.Where(o => o.Id == aId).SingleOrDefault();
}
}
public class B
{
public virtual int Id { get; set; }
public virtual Category Category { get ; set; } //enum with NEW and OLD values
public virtual int Quantity { get; set; }
}
public class BRepository
{
private SomeContext _context;
public BRepository(IUnitOfWork unitOfWork)
{
_context = unitOfWork;
}
public B GetBById(int bId)
{
return _context.B.Where(o => o.Id == bId).SingleOrDefault();
}
}
And I'm working with Entity Framework (4.1 code first).
How would I implement for example a custom property in A class like:
//returns the total of all B objects in the context where the category is NEW
public int NewBTotals
{
}
And not having to create a context?
Hopefully my question is clear enough, if not please let me know and I'll try to be more descriptive of what I want to achieve (ran out of time).
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我发现即使 B 没有 A 的外键，我也可以创建从 A 到 B 的导航属性，反之亦然，这可以自行解决问题。
I found that even by B not having a foreign key to A, I can create a navigation property from A to B and vice versa which kind of solves the problem on its own.