Lambda中的自定义相交 [英] Custom intersect in lambda
本文介绍了Lambda中的自定义相交的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想知道使用lambda表达式是否可以解决这个问题:
I would like to know if this is possible to solve using a lambda expression:
List<Foo> listOne = service.GetListOne();
List<Foo> listTwo = service.GetListTwo();
List<Foo> result = new List<Foo>();
foreach(var one in listOne)
{
foreach(var two in listTwo)
{
if((one.Id == two.Id) && one.someKey != two.someKey)
result.Add(one);
}
}
推荐答案
可以!您可以使用Linq的Intersect
扩展方法的此重载,例如,这个:
Sure you can! You can use this overload of Linq's Intersect
extension method which takes an IEqualityComparer<T>
, like this:
public class FooComparer : IEqualityComparer<Foo>
{
public bool Equals(Foo x, Foo y)
{
return x.Id == y.Id && x.someKey != y.someKey;
}
public int GetHashCode(Foo x)
{
return x.Id.GetHashCode();
}
}
...
var comparer = new FooComparer();
List<Foo> listOne = service.GetListOne();
List<Foo> listTwo = service.GetListTwo();
List<Foo> result = listOne.Intersect(listTwo, comparer).ToList();
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