I use WPF 4.5 and c# language after binding when I check subscribers for PropertyChanged event in my poco class its null and nothing in UI change after the poco class changes. why it is happening ? this is what I've done(sry for bad english) my poco object:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CafeTunes.models
{
public class Status : INotifyPropertyChanged
{
private CurrentMedia CurrentMediaValue;
public CurrentMedia CurrentMedia
{
get { return this.CurrentMediaValue; }
set
{
if (value != this.CurrentMediaValue)
{
this.CurrentMediaValue = value;
OnPropertyChanged("CurrentMedia");
}
}
}
private string playStateValue;
public string playState
{
get { return this.playStateValue; }
set
{
if (value != this.playStateValue)
{
this.playStateValue = value;
OnPropertyChanged("playState");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
my XAML :
<TextBlock Name="SongNameText" HorizontalAlignment="Left" Margin="405,71,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="19" Width="85"/>
and this is where i do the binding:
public partial class MainWindow : MahApps.Metro.Controls.MetroWindow
{
public Status AppCurrentStatus = new Status() { playState = "sdfsd", CurrentMedia = new CurrentMedia() {Artist="sdas", SongName="asdas" ,Album="asdasd",FileUrl="asdasd",Format="asdasd"} };
public MainWindow()
{
InitializeComponent();
SongNameText.SetBinding(TextBlock.TextProperty, new Binding("playState")
{
Source = AppCurrentStatus,
Mode = BindingMode.TwoWay
});
}
}
you did not set the DataContext.
public MainWindow()
{
InitializeComponent();
this.DataContext = AppCurrentStatus;
}
i would prefer declaring bindings in xaml
<TextBlock Text="{Binding playState}" HorizontalAlignment="Left" Margin="405,71,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="19" Width="85"/>
btw if you bind to a TextBlock - Mode=TwoWay makes no sense
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