C# data trigger

data trigger

When the content of Label1 is 10, the color of Label changes to red.

XAML code

<Window x:Class="WPFDataTrigger.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <Style x:Key="ColorText" TargetType="Label">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=Data}" Value="10">
                    <Setter Property="Foreground" Value="Red"></Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Grid>
        <Button Name="button1"  
            Height="23" HorizontalAlignment="Left" Margin="167,160,0,0" VerticalAlignment="Top" Width="75" 
            Click="button1_Click">
        </Button>
        <Label Name="label1"
               Height="28" HorizontalAlignment="Left" Margin="167,106,0,0"  VerticalAlignment="Top" Width="75" 
               Content="{Binding Path=Data,Mode=TwoWay}"
               Style="{StaticResource ColorText}"
               >
        </Label>
    </Grid>

</Window>

C# code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.ComponentModel;


namespace WPFDataTrigger
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        int i = 0;
        MyData myData = new MyData();


        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = myData;
            myData.Data = i.ToString();
        }


        private void button1_Click(object sender, RoutedEventArgs e)
        {
            i = (++i)%100;
            myData.Data = i.ToString();
        }
    }


    class MyData:INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        private String m_data = null;


        public void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }


        public String Data
        {
            get
            {
                return m_data;
            }
            set
            {
                m_data = value;
                OnPropertyChanged("Data");
            }
        }
    }
}

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