.net - 将多个数组聚合为一个数组 (Linq)

Question

我在将多个数组聚合成一个“大数组”时遇到了麻烦，我认为这在 Linq 中应该是可能的，但我无法理解它:(

考虑一些返回一些虚拟对象数组的方法

public class DummyObjectReceiver 
{
  public DummyObject[] GetDummyObjects  { -snip- }
}

现在我在某个地方有这个:

public class Temp
{
  public List<DummyObjectReceiver> { get; set; }

  public DummyObject[] GetAllDummyObjects ()
  {
    //here's where I'm struggling (in linq) - no problem doing it using foreach'es... ;)
  }
}

希望我想要实现的目标有点清楚 (作为额外的，我想通过 DummyObject 具有的 int 值对该数组进行排序... - 但 orderby 应该没有问题，...我希望；)

Answer 1

您使用SelectMany方法将返回对象的数组列表展平为一个数组。

public class DummyObject {
    public string Name;
    public int Value;
}

public class DummyObjectReceiver  {

    public DummyObject[] GetDummyObjects()  {
        return new DummyObject[] {
            new DummyObject() { Name = "a", Value = 1 },
            new DummyObject() { Name = "b", Value = 2 }
        };
    }

}

public class Temp {

    public List<DummyObjectReceiver> Receivers { get; set; }

    public DummyObject[] GetAllDummyObjects() {
        return Receivers.SelectMany(r => r.GetDummyObjects()).OrderBy(d => d.Value).ToArray();
    }

}

示例:

Temp temp = new Temp();
temp.Receivers = new List<DummyObjectReceiver>();
temp.Receivers.Add(new DummyObjectReceiver());
temp.Receivers.Add(new DummyObjectReceiver());
temp.Receivers.Add(new DummyObjectReceiver());

DummyObject[] result = temp.GetAllDummyObjects();