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POProper way to edit multi-level nested list of objects
 

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  1. POProper way to edit multi-level nested list of objects
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    <p>I have 3 objects:</p> <pre><code>public class Person { public int Id { get; set; } public string Name { get; set; } public string Surname { get; set; } public List&lt;Order&gt; Orders { get; set; } public Person() { Orders= new List&lt;Order&gt;(); } } public class Order { public int Id { get; set; } public string Description { get; set; } public string Date { get; set; } public List&lt;Item&gt; Items { get; set; } public Order() { Items= new List&lt;Item&gt;(); } } public class Item { public int Id { get; set; } public string ProductName { get; set; } public int Number { get; set; } } </code></pre> <p>As You can see every person can have multiple orders and every order can have multiple items.</p> <p>In my application data that comes from DB looks like so:</p> <pre><code>private List&lt;Person&gt; _persons; _persons = new List&lt;Person&gt; { new Person { Id = 1, Name = "John", Surname = "Smith", Orders = new List&lt;Order&gt; { new Order { Id = 1, Description = "First Order", Date = "2013-03-07", Items = new List&lt;Item&gt; { new Item {Id = 1, Number = 2, ProductName = "Chair"}, new Item {Id = 2, Number = 1, ProductName = "Bed"} } }, new Order { Id = 2, Description = "Second", Date = "2013-03-07", Items = new List&lt;Item&gt; { new Item {Id = 1, Number = 2, ProductName = "Pen"}, new Item {Id = 2, Number = 1, ProductName = "Pencil"} } } } }, new Person { Id = 2, Name = "Adam", Surname = "West", Orders = new List&lt;Order&gt; { new Order { Id = 1, Description = "Adams order", Date = "2013-03-07", Items = new List&lt;Item&gt; { new Item {Id = 1, Number = 2, ProductName = "first"}, new Item {Id = 2, Number = 1, ProductName = "second"} } }, new Order { Id = 2, Description = "Adams second", Date = "2013-03-07", Items = new List&lt;Item&gt; { new Item {Id = 1, Number = 2, ProductName = "Pen"}, new Item {Id = 2, Number = 1, ProductName = "Pencil"} } } } } }; </code></pre> <p>I've created custom User control with 2 labels and datagridview like this: <img src="https://i.stack.imgur.com/Az1me.png" alt="enter image description here"> below is my code:</p> <pre><code>using System.Windows.Forms; using Demo.Model; namespace Demo.Controls { public partial class OrderView : UserControl { private Order _order; public Order Order { get { return _order; } set { _order = value; UpdateView(); } } private void UpdateView() { if (_order == null) return; IdLBL.Text = string.Format("ID: {0}", _order.Id); DateLBL.Text = string.Format("Date: {0}", _order.Date); ItemsDGV.DataSource = _order.Items; } public OrderView() { InitializeComponent(); } } } </code></pre> <p>Then in main form I'm adding instances of that control to flowLayoutPanel (for every order for specific person):</p> <pre><code>private void RefreshView() { flowLayoutPanel1.Controls.Clear(); foreach (Order order in _persons[_currentPerson].Orders) { flowLayoutPanel1.Controls.Add(new OrderView {Order = order}); } } </code></pre> <p>With above data my application looks like so: <img src="https://i.stack.imgur.com/OZZrz.png" alt="enter image description here"></p> <p>I need to be able to add/edit every item of every order. Adding seems to be quite easy-I'll create new form, user will input details and then I'll do DB call to add that item.</p> <p>My questions are:<br> <strong>How can I auto refresh view after add/edit item?</strong> Can I somehow bind my control to that list to every time I update it my view updates. I need to be able to add items and orders to person. <strong>What would be the easiest way of doing that?</strong></p> <p><strong>Is this kind of display correct? Can I improve it? If yes then how?</strong></p>
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