C# Question
wpf databinding not updating from a property
I want movieinformation updated in a some textboxes depending on the selected movie
I have
public Movie SelectedMovie { get; set; }
in my viewmodel which is what my datacontext is set at
And whenever a movie is selected in my list it updates "SelectedMovie"
But only the first movie updates the textblock
<TextBlock Grid.ColumnSpan="2" Text="{Binding Path=SelectedMovie.Name}" FontSize="17" />
(The one selected when the application loads)
So not really sure why its not changing the text when I select a new movie in the list?
Movie class:
using System;
using System.ComponentModel;
namespace MovieDB3.Models
{
class Movie : INotifyPropertyChanged
{
public Movie(string name)
{
this.name = name;
}
private string name;
public string Name
{
get { return name; }
set
{
name = value;
InvokePropertyChanged("Name");
}
}
public int Id { get; set; }
private double rating;
public double Rating
{
get { return rating; }
set
{
rating = value;
InvokePropertyChanged("Rating");
}
}
public DateTime Release { get; set; }
public TimeSpan Runtime { get; set; }
public String Trailer { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
private void InvokePropertyChanged(String propertyName)
{
PropertyChangedEventArgs e = new PropertyChangedEventArgs(propertyName);
PropertyChangedEventHandler changed = PropertyChanged;
if (changed != null) changed(this, e);
}
}
}
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Answer Source
You have to fire PropertyChanged event in the setter of the SelectedMovie property in order to notify the binding that something has changed:
private Movie selectedMovie;
public Movie SelectedMovie
{
get
{
return selectedMovie;
}
set
{
selectedMovie = value;
InvokePropertyChanged("SelectedMovie");
}
}
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