How to release Image from Image Source in WPF

Question

Am loading image like below

XAML

Answer 1

To have a good code-reuse a binding converter could be used:

namespace Controls
{
    [ValueConversion(typeof(String), typeof(ImageSource))]
    public class StringToImageSourceConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (!(value is string valueString))
            {
                return null;
            }
            try
            {
                ImageSource image = BitmapFrame.Create(new Uri(valueString), BitmapCreateOptions.IgnoreImageCache, BitmapCacheOption.OnLoad);
                return image;
            }
            catch { return null; }
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

And there is a string for binding, for example

public string MyImageString { get; set; } = @"C:\test.jpg"

And in the UI the converter is used, in my case from the Library named "Controls"

<Window x:Class="MainFrame"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:controls="clr-namespace:Controls;assembly=Controls">
    <Window.Resources>
        <controls:StringToImageSourceConverter x:Key="StringToImageSourceConverter" />
    </Window.Resources>
    <Grid>
        <Image Source="{Binding MyImageString, Converter={StaticResource StringToImageSourceConverter}}" />
    </Grid>
</Window>

Answer 2

You should not use that Image directly in your application if you want to delete or move it.

imgThumbnail.Source = new BitmapImage(new Uri(filePath));

Instead, do this:

BitmapImage image = new BitmapImage();
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad;
image.UriSource = new Uri(filePath);
image.EndInit();
imgThumbnail.Source = image;

For more read this