我在使用嵌套列表时遇到了麻烦。所以我有3个类(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;}
}
我想从 Class1 中选择所有 Class3.Name 其中 Class2.Name = "something"并且重要的是结果将是 IEnumerable 字符串 。我该如何解决?
最佳答案
LINQ 表达式可以有多个嵌套的 from
子句:
// 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;
为了完整起见,这里有两个使用方法语法的变体:
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)));
关于c# - 带有大量嵌套列表的列表上的 LINQ,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/18736513/