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?)、エクササイズ(p. 133)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" /> --> <Label Text="始点km" /> <Slider x:Name="startingMileage" Maximum="999999" Minimum="1"/> <Label Text="終点km" /> <Slider x:Name="endingMileage" Maximum="999999" Minimum="1"/> <Label Text="返済額"/> <Label x:Name="label4" FontSize="12" FontAttributes="Bold" Text="label4" /> <Button x:Name="button1" Text="計算" 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 { private double milesTraveled; private double reimburseRate = 18; private double amountOwed; public MainPage() { InitializeComponent(); } private void button1_Clicked(object sender, EventArgs e) { if (startingMileage.Value < endingMileage.Value) { milesTraveled = endingMileage.Value - startingMileage.Value; amountOwed = milesTraveled * reimburseRate; label4.Text = amountOwed + "円"; } else { DisplayAlert( "走行kmを計算できません", "始点kmは、終点kmよりも小さい数字でなければなりません。", "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 = "走行km数計算" }; } 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 } } }
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