C# - Xamarin - 型と参照 - 10時です。データがどこにあるかわかりますか？(配列、Length、forループ、インデックス(添字))

Head First C#
原著

開発環境

• OS: Windows 10 Pro
• IDE(統合開発環境): Visual Studio Community 2017

Head First C# ―頭とからだで覚えるC#の基本 (Andrew Stellman (著)、Jennifer Greene (著)、佐藤 嘉一 (監修, 監修)、木下 哲也 (翻訳)、オライリージャパン)の4章(型と参照 - 10時です。データがどこにあるかわかりますか？)、自分で考えてみよう(p. 155)を取り組んでみる。

コード

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:App1"
             x:Class="App1.MainPage">

    <StackLayout>
        <!-- Place new controls here -->
        <!--
     <Label Text="Welcome to Xamarin.Forms!" 
           HorizontalOptions="Center"
           VerticalOptions="CenterAndExpand" />
        -->
        <Button x:Name="button1"
                Text="button1"
                Clicked="button1_Clicked"/>
    </StackLayout>

</ContentPage>

MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace App1
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void button1_Clicked(object sender, EventArgs e)
        {
            Elephant[] elephants =
            {
                new Elephant(){name="リロイド", earSize=100},
                new Elephant(){name="ルシンダ", earSize=85 },
                new Elephant(){name="ラリー", earSize=105 },
                new Elephant(){name="ルシール", earSize=82 },
                new Elephant(){name="ラース", earSize=110 },
                new Elephant(){name="リンダ", earSize=93 },
                new Elephant(){name="ハンフリー", earSize=113 },
            };
            Elephant biggestEars = elephants[0];
            string result = "";
            int[] vs = { 100, 105, 105, 110, 110, 113 };
            for (int i = 1; i < elephants.Length; i++)
            {
                if (elephants[i].earSize > biggestEars.earSize)
                {
                    biggestEars = elephants[i];
                }
                result += (vs[i - 1] == biggestEars.earSize) + "\n";
            }
            DisplayAlert(
                "", 
                biggestEars.earSize.ToString() + "\n" + result,
                "OK");
        }
    }

    public class Elephant:ContentPage
    {
        public string name;
        public int earSize;

        public void WhoAmI()
        {
            DisplayAlert(
                name + "が言った・・・",
                "私の耳の大きさは" + earSize + "cmです。",
                "OK");
        }
    }
}

App.xaml

<?xml version="1.0" encoding="utf-8" ?>
<Application xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="App1.App">
    <Application.Resources>
        
    </Application.Resources>
</Application>

App.xaml.cs

using System;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

[assembly: XamlCompilation (XamlCompilationOptions.Compile)]
namespace App1
{
 public partial class App : Application
 {
  public App ()
  {
   InitializeComponent();

            // MainPage = new MainPage();
            MainPage = new NavigationPage(
                new MainPage() { Title = "" });
  }

  protected override void OnStart ()
  {
   // Handle when your app starts
  }

  protected override void OnSleep ()
  {
   // Handle when your app sleeps
  }

  protected override void OnResume ()
  {
   // Handle when your app resumes
  }
 }
}