<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/showHello" /><Buttonandroid:text="Click Me"android:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/sayHello" />
</LinearLayout>

public class MainActivity : Activity{protected override void OnCreate(Bundle bundle){base.OnCreate(bundle);// 加载布局
            SetContentView (Resource.Layout.Main);}}

// 获取布局中的控件
Button say = FindViewById<Button>(Resource.Id.sayHello);
TextView show = FindViewById<TextView>(Resource.Id.showHello);

// 绑定 Click 事件
say.Click += (sender, e) =>
{};

using Android.App;
using Android.Widget;
using Android.OS;namespace HelloAndroid
{[Activity(Label = "HelloAndroid", MainLauncher = true, Icon = "@drawable/icon")]public class MainActivity : Activity{int count = 0;protected override void OnCreate(Bundle bundle){base.OnCreate(bundle);// 加载布局
            SetContentView (Resource.Layout.Main);// 获取布局中的控件Button say = FindViewById<Button>(Resource.Id.sayHello);TextView show = FindViewById<TextView>(Resource.Id.showHello);// 绑定 Click 事件say.Click += (sender, e) =>{count++;show.Text = "Hello, Android";say.Text = $"You Clicked {count}";// Toast 通知Toast.MakeText(this, $"You Clicked {count}", ToastLength.Short).Show();};}}
}