nuitsjp

using System;
using System.Threading.Tasks;

namespace SingletonSample
{
    class Program
    {
        static void Main(string[] args)
        {
        }

nuitsjp

using System;
using System.Threading.Tasks;

namespace SingletonSample
{
    class Program
    {
        static void Main(string[] args)
        {
            Run();

nuitsjp

using System;
using System.Threading.Tasks;

namespace SingletonSample
{
    class Program
    {
        static void Main(string[] args)
        {
            Task.Run(async () =>

nuitsjp

using System;
using System.Linq;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace SingletonSample
{
    class Program
    {
        static void Main(string[] args)

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            // SDカードがマウントされているか確認する
            if(Android.OS.Environment.ExternalStorageState == Android.OS.Environment.MediaMounted)
            {
                var fileName = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.Path, "0000.png");
                // 画像ファイルの存在確認
                if(File.Exists(fileName))
                {
                    var bitmap = Android.Graphics.BitmapFactory.DecodeFile(fileName);
                    ImageButton imageButton = FindViewById<ImageButton>(Resource.Id.MyImageButton);
                    imageButton.SetImageBitmap(bitmap);

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<Window x:Class="CommandSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:CommandSample"
        Title="MainWindow" Height="350" Width="525">
    <Window.DataContext>
        <local:MainWindowViewModel/>
    </Window.DataContext>
    <StackPanel Orientation="Vertical">
        <Label Content="氏名"/>

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        public DelegateCommand ExecuteCommand { get; }

        public MainWindowViewModel()
        {
            ExecuteCommand = 
                new DelegateCommand(
                    () =>　Result = "登録されました",
                    CanExecute);
        }

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        private string _name;
        public string Name
        {
            get { return _name; }
            set
            {
                if (OnPropertyChanged(ref _name, value))
                    ExecuteCommand.RaiseCanExecuteChanged();
            }
        }

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    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
    {
        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            global::Xamarin.Forms.Forms.Init();
            LoadApplication(new App(new iOSInitializer()));
            return base.FinishedLaunching(app, options);
        }
    }

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    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
    {
        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            global::Xamarin.Forms.Forms.Init();
            LoadApplication(new App());
            return base.FinishedLaunching(app, options);
        }
    }