Question

I have a class structure like below.

ObservableCollection<Group> deviceCollection = new ObservableCollection<Group>();
public class Group 
{ 
    public string Name { get; set; }       
    public List<TargetSelectionStructure> TargetCollection { get; set; }
}
public class TargetSelectionStructure
{
    public string ItemId { get; set; }
    public string Name { get; set; }
    public bool IsGroup { get; set; }
}

From the observable collection object deviceCollection. I need to get the collection which matches with IsGroup property as false. So I have written like

var currentStruct = deviceCollection.Where(d => d.TargetCollection.Any(t => t.IsGroup == false));

Now the currentStruct should contain the collection basically List<TargetSelectionStructure>. I am unable to cast the currentStruct to the type of List<TargetSelectionStructure>.
How can I solve this?

Answer 1

You can’t cast it, because currentStruct is an IEnumerable<Group>.

I think you query needs to look like this:

var currentStruct = deviceCollection.SelectMany(x => x.TargetCollection)
                                    .Where(x => !x.IsGroup).ToList();

This returns all TargetSelectionStructure instances from all Groups that have IsGroup == false.

Your question is not entirely clear. It is possible to interpret your question in a second way: You want to have all TargetSelectionStructure instances from a Group if at least one of them has IsGroup == false.
To achieve this, you would use this query:

var currentStruct = deviceCollection.Where(x => x.TargetCollection
                                                 .Any(y => !y.IsGroup))
                                    .SelectMany(x => x.TargetCollection)
                                    .ToList();