Main.cs

using System;
using System.Linq;
using System.Collections.Generic;

public class Hello{
    public static void Main(){
        // Here your code !
        var t = new {a = 0f, b = 0f};
        
        Func<float, object> hoge = (float x) => new {a = x+1, b = x-1};
        Func<float, object> fuga = (float y) => new {a = y*2, b = y/2};
        
        var poyo = new[]{3f, 4f};
        var puyo = new[]{5f, 6f, 7f};
        
        foreach (var item in poyo.Select(hoge)) {
            Console.WriteLine(Cast(item, new {a = 0f, b = 0f}).a);
        }
        
        foreach (var item in puyo.Select(fuga)) {
            Console.WriteLine(Cast(item, new {a = 0f, b = 0f}).b);
        }
    }
    
    private static T Cast<T>(object obj, T type)
    {
        return (T)obj;
    }
}