Question

I’ve an ObservableCollection which includes another ObservableCollection.

ObservableCollection<MyModel> models = new ObservableCollection<MyModel>();

My models looks like that:

public class MyModel
{
    public ObservableCollection<MyModel2> list2 { get; set; }
    public string Property1 { get; set; }
}

public class MyModel2
{
    public string Property2 { get; set; }
    public string Property3 { get; set; }
}

Now I want to find all MyModel2 items in models which “Property2” == “test1” and “Property3” == “test2”

I know how to search in just one list2 to find the right items, but i want to search in all “list2” in the models-collection.

var result = from mod 
             in list2
             where mod.Property2 == "test1" && mod.Property3 == "test2"
             select mod;

Any help would be grateful.

Answer 1

It sounds like you want something like:

var query = from model in models
            from model2 in model.list2
            where model2.Property2 == "test1" && model2.Property == "test2"
            select model2;

Or in non-query expression form:

var query = models.SelectMany(model => model.list2)
                  .Where(model2 => model2.Property2 == "test1"
                                   && model2.Property == "test2");