Business Objects Collection 中具有 lambda 标准的通用方法

发布于 2024-07-19 00:28:30 字数 370 浏览 5 评论 0原文

我的应用程序中的每个业务对象都有抽象类 (BO) 还有父（通用）集合来存储所有 BO（名为 BOC - 业务对象集合）

我想要存档的是在 BOC 内创建的通用方法，类似于：

public  T GetBusinessObject (lambda_criteria)

所以我可以调用类似于以下的方法：

Employee emp = BOC.GetBusinessObject( Employee.ID=123 )

并且方法应返回满足指定 lambda 标准的 BO

有如何存档的提示吗？

原文

I have abstract class for each Business Object in my app (BO)
Also have parent (generic) collection to store all BOs (named BOC - Business Object Collection)

What I would like to archive is created universal method iniside BOC similar to:

public  T GetBusinessObject (lambda_criteria)

So I could call this method similar to:

Employee emp = BOC.GetBusinessObject( Employee.ID=123 )

And method shall return BO meet to specified lambda criteria

Any tips how to archive that?

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在巴黎塔顶看东京樱花 2024-07-26 00:28:30

假设您的 BOC 在内部继承或使用通用列表，这并不太难：

T GetBusinesObject<T>( Func<T, bool> predicate )
{
    return this.FirstOrDefault( predicate );
}

Assuming that your BOC inherits from or uses a generic list internally it's not too hard:

T GetBusinesObject<T>( Func<T, bool> predicate )
{
    return this.FirstOrDefault( predicate );
}

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空心↖ 2024-07-26 00:28:30

类似的东西

T GetBusinessObject<T>(Predicate<T> constraint) where T : BO

，然后

GetBusinessObject<Employee>( e => e.ID = 123 )

可能会被称为类似的东西？

Something like

T GetBusinessObject<T>(Predicate<T> constraint) where T : BO

and then called like

GetBusinessObject<Employee>( e => e.ID = 123 )

perhaps?

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擦肩而过的背影 2024-07-26 00:28:30

如果这是一个通用集合，那么调用者应该已经（通过 LINQ）能够使用：

BOC<Employee> boc = ...
// checks exactly 1 match, throws if no match
var emp = boc.Single(e => e.ID = 123);
// checks at most 1 match, null if no match
var emp = boc.SingleOrDefault(e => e.ID = 123);
// checks at least one match, throws if no match
var emp = boc.First(e => e.ID = 123);
// returns first match, null if no match
var emp = boc.FirstOrDefault(e => e.ID = 123);

那可以吗？

If this is a generic collection, then the caller should already (via LINQ) be able to use:

BOC<Employee> boc = ...
// checks exactly 1 match, throws if no match
var emp = boc.Single(e => e.ID = 123);
// checks at most 1 match, null if no match
var emp = boc.SingleOrDefault(e => e.ID = 123);
// checks at least one match, throws if no match
var emp = boc.First(e => e.ID = 123);
// returns first match, null if no match
var emp = boc.FirstOrDefault(e => e.ID = 123);

that do?

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