XF 标签和文本控件

<?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:App17"
             x:Class="App17.MainPage">
    <StackLayout>        
        <Label x:Name="myLabel" FontSize="Large" Text="hello" FontAttributes="Italic" TextColor="Accent"></Label>
        <Entry x:Name="myEntry" Placeholder="请输入内容" FontSize="Medium" FontAttributes="Bold" PlaceholderColor="DimGray" IsPassword="True"></Entry>
    </StackLayout>
</ContentPage>

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

namespace App17
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
            myEntry.Completed += (s, e) => 
            {
                Entry entry = (Entry)s;
                myLabel.Text = entry.Text;
            };
           myEntry.TextChanged += (s, e) => 
           {
               Entry entry = (Entry)s;
               myLabel.Text = entry.Text;
           };
        }
    }
}