Cannot convert type IEnumerable to ObservableCollection…are you missing a cast?

Question

I\'m trying to return entities where the bool \"isAssy\" is true:

 public ObservableCollection ParentAssemblyBOM
 {
      get {return          


        

Answer 1

ObservableCollection<T> has an overloaded constructor that accepts an IEnumerable<T> as a parameter. Assuming that your Linq statement returns a collection of MasterPartsList items:

public ObservableCollection<MasterPartsList> ParentAssemblyBOM
{
    get 
    {
        var enumerable = this._parentAssemblyBOM
                             .Where(parent => parent.isAssy == true);

        return new ObservableCollection<MasterPartsList>(enumerable); 
    }
}

Answer 2

You have to explicitly create the ObservableCollection which at it's most simplest is:

public ObservableCollection<MasterPartsList> ParentAssemblyBOM
{
    get {return new ObservableCollection<MasterPartsList>(this._parentAssemblyBOM.Where(parent => parent.isAssy == true)); }
}

This is potentially inefficient as you are creating new collection every time. However, this might be the simplest solution if you are returning a radically different set of data each time. Otherwise you have to loop through the collection removing items that are no longer in the return set and adding new items.