Removing specific object from a container and add it to another

[sadas232341s]

I figured out how to see if an object within a container is a specific object, but how to translate it to another container? The following doesn' t work.

foreach (UIElement el in LayoutRoot.Children)
{
if (el is Button)
{
LayoutRoot.Children.Remove(el);
StackPanel1.Children.Add(el);
}
}

[Parwej Ahamad]

As per my understadning, it is containing reference of button so it may be the cause. Try with following DeepCopy approach:

foreach (UIElement el in LayoutRoot.Children)
{
if (el is Button)
{
string shapestring = XamlWriter.Save(el);
StringReader stringReader = new StringReader(shapestring);
XmlTextReader xmlTextReader = new XmlTextReader(stringReader);
UIElement DeepCopyobject = (UIElement)XamlReader.Load(xmlTextReader);
StackPanel1.Children.Add(DeepCopyobject);
LayoutRoot.Children.Remove(el);
}
}

If it is not working or if you have any other approach then please let me know. Thanks,

Parwej Ahamad ahamad.parwej@gmail.com

[Michael Eber]

If you run that code in debug mode you WILL experience an exception. You cannot remove an item from a collection that is being enumerated. So what I do in that case is this:

    List<int> itemsToRemove = new List<int>();
    for ( int index = 0; index<LayoutRood.Children.Count; index++ )
    {
          if ( LayoutRoot.Children\[index\] is Button )
               itemsToRemove.Add(index);
    }
    // Next process the items to move
    foreach ( int element in itemsToRemove )
    {
       Button oldElement = LayoutRoot.Children\[element\] as Button;
       LayoutRood.Children.RemoveAt(element);
       StackPanel1.Children.Add(oldElement);
    }

Take this one warning into account: you MIGHT get an exception that the element is already a member of another collection. The exception will point at your StackPanel1 add to the elements. If that happens then do the following:

       Button newElement = new Button;
       newElement.Name = oldElement.Name;
            .
            .
            .
       // you get the idea
       // now add the new instance of the button to the collection