Check Object type in List of Objects

Question

Got a WPF Form with a StackPanel containing Expanders with StackPanels in it.

Answer 1

If I understand You correctly you can use this LINQ Expression

var w = tmpList.Where(x=>x.IsTypeOf(StackPanel)).SingleOrDefault();

Answer 2

You can use OfType<> to filter for just a specific type in a list. I understand that you want to loop through all the StackPanels (in the list), so you can do something like this:

foreach(var panel in tmpList.OfType<StackPanel>()){
    //your work here ...
}

If you want to check if there is any StackPanel, then use this:

if(tmpList.OfType<StackPanel>().Any()){
    //...
}

Answer 3

I would do something like this: use the Enumerable.OfType<>()

More info: https://msdn.microsoft.com/en-us/library/vstudio/bb360913(v=vs.100).aspx

foreach(var stackpanel in tmpList.OfType<StackPanel>())
{
    // search for the label. (the same trick)
    var myLabel = stackpanel.Children.OfType<Label>().FirstOrDefault();

    // if the label can't be found, continue to the next one.
    if(myLabel == null)
        continue;

    myLabel.Content = "whatever";
}

Answer 4

Not many questions answer this part of the question. "Now i must know if the list contains an object of type stackpanel." Which can be achieved through the following:

if (tmpList.Any(x=>x.IsTypeOf(StackPanel)))
{
     //returns true if there are any stack panels in the list 
}