Question

How can I know which of the following linq queries will be executed?

    // I think this will not be executed
    var temp1 = PdvEntities.Entities.Products;

    // Not sure
    IEnumerable<Data.Products> temp2 = PdvEntities.Entities.Products;

    // will not be executed
    var temp3 = from a in PdvEntities.Entities.Products select a;

    ListView lv1 = new ListView();
    lv1.DataContext = temp1; // will this make the first query to be executed?
    lv1.ItemsSource = temp2; // will this make the second query execute?

    // I think this will be executed
    var temp4 = PdvEntities.Entities.Products.ToList();

note I am using the ADO.Net entity data model to execute the queries from the table Products in my database

Answer 1

temp2 will be evaluated when the UI updates the listview.

temp1 will never be evaluated unless you have a binding to the ListView’s DataContext.