Hi
I have two objects MetaItems and Items.
MetaItem is template for objects and Items contains actual values. For example "Department" is treated as meta-item and "Sales", "UK Region", "Asia Region" are treated as items.
Additionally I want to maintain parent-child relation on these meta-items and items.
I have following code for same -
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace WpfApplication12
{
public interface IEntity
{
int Id { get; set; }
string Name { get; set; }
}
public interface IHierachy<T>
{
IHierachy<T> Parent { get; }
List<IHierachy<T>> ChildItems { get; }
List<IHierachy<T>> LinkedItems { get; }
}
public class Entity : IHierachy<IEntity>, IEntity
{
#region IObject Members
private int _id;
public int Id
{
get
{
return _id;
}
set
{
_id = value;
}
}
private string _name;
public string Name
{
get
{
return _name;
}
set
{
_name = value;
}
}
#endregion
#region IHierachy<IEntity> Members
public IHierachy<IEntity> _parent;
public IHierachy<IEntity> Parent
{
get
{
return _parent;
}
}
private List<IHierachy<IEntity>> _childItems;
public List<IHierachy<IEntity>> ChildItems
{
get
{
if (_childItems == null)
{
_childItems = new List<IHierachy<IEntity>>();
}
return _childItems;
}
}
private List<IHierachy<IEntity>> _linkedItems;
public List<IHierachy<IEntity>> LinkedItems
{
get
{
if (_linkedItems == null)
{
_linkedItems = new List<IHierachy<IEntity>>();
}
return _linkedItems;
}
}
#endregion
}
public class Item : Entity
{
}
public class MetaItem : Entity
{
}
}
Following is my test class -
public class Test
{
public void Test1()
{
MetaItem meta1 = new MetaItem() { Id = 1, Name = "MetaItem1"};
MetaItem meta2 = new MetaItem() { Id = 1, Name = "MetaItem 1.1"};
Item meta3 = new Item() { Id = 101, Name = "Item 1" };
**meta1.ChildItems.Add(meta3);** // this line should not compile.
meta1.ChildItems.Add(meta2) // This is valid and gets compiled.
}
}
In the test class, when I am buidling parent-child relation, I can add item as a child object for meta-item object. Here I want compilation error to be generated.
Can someone help me in achiving this.
-Regards Raj