Progerssbar won't update - wpf

Question

I'm trying to implement a progressbar in my WPF application.
So I added one to my view
<ProgressBar Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="3" Height="31"
Minimum="0"
Maximum="50"
Value="{Binding CurrentProgress}" />
My ViewModel got a new property:
public int CurrentProgress
{
get { return mCurrentProgress; }
set
{
if (mCurrentProgress != value)
{
mCurrentProgress = value;
RaisePropertyChanged("CurrentProgress");
}
}
}
When my load command executes, it raises an Generated event for every file loaded.
And the EventHandler for this event adds +1 to the 'CurrentProgress' property like this:
private void GeneratedHandler(object sender, EventArgs eventArgs)
{
CurrentProgress++;
}
But I don't see any progress on the bar. Does anybody see what I'm doing wrong?
Thanks in advance!

Answer 1

I've tried reproducing your problem, but it worked just fine here.
Anyway, there are a few steps that you can follow:
Make sure that you are not loading your files on the UI thread. If you are, take a look at "Showing progress while performing a lengthy task" on this article.
Make sure the DataContext of your Window is correct, your ViewModel implements System.ComponentModel.INotifyPropertyChanged and your RaisePropertyChanged method is correct.
Here's the code I've used (do not copy and paste the app.xml):
ViewModel:
public class MainWindowViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged([CallerMemberName] string property = "")
{
if(PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
private int _Progress;
public int Progress
{
get
{
return _Progress;
}
set
{
if(value != Progress)
{
_Progress = value;
NotifyPropertyChanged();
}
}
}
}
MainWindow.xml
<Window x:Class="WpfApplication1.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"
DataContext="{StaticResource ResourceKey=ViewModel_MainWindow}">
<Grid>
<ProgressBar Value="{Binding Progress}" Minimum="0" Maximum="50" />
</Grid>
And the app.xaml:
<Application x:Class="WpfApplication1.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml"
xmlns:local="clr-namespace:WpfApplication1" > <!--change the namespace to the one where you ViewModel is-->
<Application.Resources>
<local:MainWindowViewModel x:Key="ViewModel_MainWindow" /> <!--important-->
</Application.Resources>