LINQ名单上有很多嵌套列表 [英] LINQ on List with lot of nested List
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问题描述
我有麻烦嵌套列表。所以,我有3类:
I have got trouble with nested lists. So I have 3 class:
public class Class1
{
public string Name {get;set;}
public List<Class2> Class2List {get;set;}
}
public class Class2
{
public string Name {get;set;}
public List<Class3> Class3List {get;set;}
}
public class Class3
{
public string Name {get;set;}
}
我想选择所有Class3.Name哪里Class2.Name = 1级,从东西和重要的结果将是的字符串的IEnumerable 。我应该如何解决?
I would like to select all Class3.Name where Class2.Name = "something" from Class1 and important that the result will be IEnumerable string . How should I resolve it?
推荐答案
LINQ表达式可以有多个嵌套的从
条款:
LINQ expressions can have multiple nested from
clauses:
// nested from clauses
var names = from c1 in myClass1List
from c2 in c1.Class2List
where c2.Name == "something"
from c3 in c2.Class3List
select c3.Name;
有关完整,这里使用方法的语法两个变种
For completeness, here are two variants using method syntax:
var names = myClass1List
.SelectMany(c1 => c1.Class2List.Where(c2 => c2.Name == "something"))
.SelectMany(c2 => c2.Class3List.Select(c3 => c3.Name));
var names = myClass1List
.SelectMany(c1 => c1.Class2List
.Where(c2 => c2.Name == "something")
.SelectMany(c2 => c2.Class3List
.Select(c3 => c3.Name)));
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