如何将带条件的嵌套foreach循环转换为LINQ [英] How to convert nested foreach loops with conditions to LINQ

问题描述

我想问一下是否可以将下面的嵌套foreach循环转换为LINQ表达式.

I'd like to ask if it is possible to convert below nested foreach loops to LINQ expression.

public interface IFoo
{
  bool IsCorrect(IFoo foo);
  void DoSomething(IFoo foo);
}

List<IFoo> listA; //assume that contains items
List<IFoo> listB; //assume that contains items


foreach (var a in listA)
{
  foreach (var b in listB)
  {
    if (b.IsCorrect(a))
    {
      b.DoSomething(a);
    }
  }
}

推荐答案

这应该有效:

var result =
    from a in listA
    from b in listB
    where b.IsCorrect(a)
    select new {a, b};

foreach (var item in result)
    item.b.DoSomething(item.a);

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