EF Core 如何过滤 treeview 而不实际将数据保存到数据库中

Question

I have to filter a telerik radtreeview structure of EF Core objects like below, I need all Employees with the name "John", filtering is working fine,

-> Companies (Company A, Company B)

--> Departments (In Company A => IT, HR, Admin)

---> Employees (In IT => John, Smith, Aron)

So After filter, if I do some action which Save context changes, it causes app to save filtered data as well. Eg From above example relationship between IT and Smith, Aron breaks.

Any suggestions on how to implement this without actually getting this data saved in DB and also without using any other model classes.

Following is a sample code

private ObservableCollection<Company> FilterCollection(ObservableCollection<Company> collection)
    {
        foreach (Company company in collection)
        {
            foreach (Departments department in company.Departments)
            {
                department.Employees = new List<Employees>(department.Employees.Where(p => p.name == "John"));
            }
        }
        return new ObservableCollection<Company>(collection);
    }

Answer 1

You can create in the method a list of items of the type Company. You can iterate the collection received as a parameter, and every item that matches your rules (Have the name John for example), add it to the list created. And at the end, return the generated list.