有没有LINQ方法来实现这一目标?非常感谢任何帮助。
class Program
{
static void Main(string[] args)
{
Parent parent1 = new Parent();
parent1.Name = "P1";
Parent parent2 = new Parent();
parent2.Name = "P2";
Child child1 = new Child();
child1.Name = "C1";
Child child2 = new Child();
child2.Name = "C2";
Child child3 = new Child();
child3.Name = "C3";
Child child4 = new Child();
child4.Name = "C4";
parent1.Children.Add(child1);
parent1.Children.Add(child2);
parent2.Children.Add(child3);
parent2.Children.Add(child4);
List<Parent> parentCollection = new List<Parent>();
parentCollection.Add(parent1);
parentCollection.Add(parent2);
List<string> nameCollection = new List<string>();
foreach( Parent parent in parentCollection){
nameCollection.Add(parent.Name);
foreach(Child child in parent.Children)
nameCollection.Add(child.Name);
}
}
}
public class Parent
{
public string Name = string.Empty;
public List<Child> Children = new List<Child>();
}
public class Child
{
public string Name = string.Empty;
}
答案 0 :(得分:4)
您可以使用SelectMany来展平子集合:
var all = parentCollection.Select(p=>p.Name)
.Concat(parentCollection
.SelectMany(p=>p.Children).Select(c=>c.Name));
请注意,这只适用于父/子关系的一个深度。哟有真正的递归(几个级别),你必须实现一个递归生成孩子的迭代器。
编辑:让孩子们按照正确的顺序,丑陋的东西起作用:
var all = parentCollection.Select(p=>new {Parent=p.Name, Name = ""})
.Concat(parentCollection.SelectMany(p=>p.Children
.Select(c => new {Parent=p.Name, c.Name})))
.OrderBy(o => o.Parent).ThenBy(o => o.Name)
.Select(o=> o.Name != "" ? o.Name : o.Parent);