Changing Image Source code behind by binding wpf

Question

I'm trying to change an image source by clicking on something.

my .xaml

<Canvas Name="img_Canvas" Grid.IsSharedSizeScope="True">
        <Image Source="{Binding ImageType_Source}" Name="autoImage" Margin="5"/>

my .cs

private string _ImageType_Source;
        public string ImageType_Source
        {
            get { return _ImageType_Source; }
            set { 
                _ImageType_Source = value;
                OnPropertyChanged("ImageType_Source");
            }
        }

        public exImage()
        {
            InitializeComponent();
            DataContext = this;

So when I click on e.g Ellipse, I want to change the image.

private void Ellipse_MouseDown(object sender, MouseButtonEventArgs e)
        {
            ImageType_Source = "/ANKE_Test;component/imagesFolder/Bild_Getriebe.jpg";
            string test = autoImage.Source.ToString();

After changing the source the PropertyChangedEvent is fired with PropertyChanged = null but with the new source. Unfortunately the source in the image is still the old one and is not changing.

if PropertyChanged == null that implies that nothing is listening to the event so the UI can't react and change. Does your .cs implement INotifyPropertyChanged? — ChrisF
– ChrisF, Commented Nov 17, 2015 at 14:07
Shouldn't the code be if (this.PropertyChanged != null) this.PropertyChanged(this, new PropertyChangedEventArgs(name)); rather than OnPropertyChanged(name);. You're not firing the event. — ChrisF
– ChrisF, Commented Nov 17, 2015 at 14:12

StijnvanGaal · Accepted Answer · 2015-11-17 14:14:26Z

1

When working with INotifyPropertyChanged I usually make my own NotifyPropertyChanged method like this:

private void NotifyPropertyChanged(String info) {
        if (PropertyChanged != null) {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }

Did you do this to with your OnPropertyChanged method?

answered Nov 17, 2015 at 14:14

StijnvanGaal

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