How to get a child of an “object sender” in a method?

Question

I have a 15 borders with an image inside of it in my application that calls a method on MouseUp.. all images have different names.. hence why i want them all to call this one method

<GroupBox Width="75" Height="75">
      <Border MouseLeftButtonUp="Image_MouseUp1" Background="Transparent">
           <Image x:Name="RedPick5_Image" Height="Auto" Width="Auto"/>
      </Border>
</GroupBox>

I want all of them to be able to set the image source of the child (the image is the child of the border if i understand correctly.. how can i do this?

        private void Image_MouseUp1(object sender, MouseButtonEventArgs e)
        {
            //want to set any image that calls this
            //something like Sender.Child.Source = ...
        }

Answer 1

you need to cast the sender and check

    private void Image_MouseUp1(object sender, MouseButtonEventArgs e)
    {
        var border = sender as Border; // Cast to Border
        if (border != null)            // Check if the cast was right
        {
            var img = border.Child as Image;  // Cast to Image
            if (img != null)                  // Check if the cast was right
            {
                // your code
            }
            // else your Child isn't an Image her you could hast it to an other type
        }
        // else your Sender isn't an Border
    }

you could also do this

    private void Image_MouseUp1(object sender, MouseButtonEventArgs e)
    {
        var border = sender as Border;
        if (border == null) // if the cast to Border failed
            return;         

        var img = border.Child as Image;
        if (img == null) // if the cast to Image failed
            return;

        // your code
    }

Answer 2

You can do this way in case image is only and immediate child of border:

Image image = (Image)((Border)sender).Child;
image.Source = // Set image source here.

Answer 3

Alternatively you can use FindName

(Image)(sender as Border).FindName("RedPick5_Image");

It will search Border 's children recursively for an element named "RedPick5_Image". This may return null if no elements with the specified name is found.