CODEWITHSUNDEEP
c#wpfdata-binding
GETah
GETah

Reputation: 21449

Image binding in WPF

I have an Image control that is supposed to do a slide show. Here are the binding I used to achieve this:

    Binding mapBinding = new Binding();
    mapBinding.Source = slideView;
    mapBinding.Path = new PropertyPath("ImageDrawing");
    sliderImage.SetBinding(System.Windows.Controls.Image.SourceProperty, mapBinding);

And a class SlideImage

public class SlideImage : INotifyPropertyChanged {
    public ImageSource ImageDrawing{get;set;} 
    public void ChangeImage(){
         // Load another image
         // Update ImageDrawing
         // Fire property changed event
    }
    public event PropertyChangedEventHandler PropertyChanged;
}

I found many examples on the net using the UpdateSourceTrigger to listen for data source changes. The only problem is the Image control does not have that property.

How do I hook up my sliderImage control to update on SlideImage.PropertyChanged?

Upvotes: 0

Views: 382

Answers (1)

Merlyn Morgan-Graham
Merlyn Morgan-Graham

Reputation: 59151

It probably will update automatically, if you're actually calling PropertyChanged when calling the setter of ImageDrawing.

You aren't firing PropertyChanged for your ImageDrawing property in the code you've provided. Try this:

private ImageSource imageDrawing;
public ImageSource ImageDrawing
{
    get { return imageDrawing; }
    set
    {
        imageDrawing = value;
        RaisePropertyChanged("ImageDrawing");
    }
}

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

Upvotes: 2

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