如何从列表中获取数组元素的一些对象

Question

public class Ex
{
   public string example1{get;set;}
   public string example2{get;set;}
   public Test test{get;set;}
}    

public class Test
{
   public string example3 {get;set;}
 public long[] arrayLong{get;set;}
}

我有List listEx，例如10个元素。如何获得arraylong？

long[] result = listEx.Select( x=> x.Test.Select(y =>y.arrayLong)).ToArray();

我只需要长[]如何解析它？

Answer 1

使用function numbersOnly(arr){ for(var i = 0; i < arr.length; i++){ if(typeof arr[i] === "string"){ delete arr[i]; } } console.log(arr); } numbersOnly([1, "apple", -3, "orange", 0.5, 22, "hello", 6]) 功能，将“收集”集合集合到一个集合。

SelectMany

来自MSDN：Enumerable.SelectMany Method

Answer 2

您应该使用SelectMany

var outresult = listEx.SelectMany(t => t.Test.Select(s => s.arrayLong)).ToArray();