Whats the best way for a child class to know about its parent class

[moondaddy]

I'm using WPF and c#. Whats the best way for a child class to know about
it's parent class? For examle

class ParentClass : CollectionBase
{
// code...

class ChildClass
{
// code...

void SomeMethod()
{
if(myParentClas s.Count>0)
{
//do something
}
}

}
}

Thanks.

--
mo*******@noema il.noemail

[Walter Wang [MSFT]]

Hi moondaddy,

The ChildClass will not have any reference to the ParentClass. Consider
this: an instance of ChildClass could be added to multiple ParentClass.

If you could guarantee an instance of ChildClass could only be added to one
ParentClass. You could create a public property in the ChildClass to hold
the reference to ParentClass and let the ParentClass.Add or Insert to set
this reference.

class ChildClass
{
private ParentClass _parent;

internal ParentClass Parent
{
get { return _parent; }
set { _parent = value; }
}

}

class ParentClass : CollectionBase
{
public int Add(ChildClass item)
{
if (item != null) item.Parent = this;
return List.Add(item);
}

public void Insert(int index, ChildClass item)
{
if (item != null) item.Parent = this;
List.Insert(ind ex, item);
}
}

Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

=============== =============== =============== =====
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=============== =============== =============== =====

This posting is provided "AS IS" with no warranties, and confers no rights.

[moondaddy]

Great thanks Walter.
"Walter Wang [MSFT]" <wa****@online. microsoft.comwr ote in message
news:0W******** ******@TK2MSFTN GHUB02.phx.gbl. ..

Hi moondaddy,

The ChildClass will not have any reference to the ParentClass. Consider
this: an instance of ChildClass could be added to multiple ParentClass.

If you could guarantee an instance of ChildClass could only be added to
one
ParentClass. You could create a public property in the ChildClass to hold
the reference to ParentClass and let the ParentClass.Add or Insert to set
this reference.

class ChildClass
{
private ParentClass _parent;

internal ParentClass Parent
{
get { return _parent; }
set { _parent = value; }
}

}

class ParentClass : CollectionBase
{
public int Add(ChildClass item)
{
if (item != null) item.Parent = this;
return List.Add(item);
}

public void Insert(int index, ChildClass item)
{
if (item != null) item.Parent = this;
List.Insert(ind ex, item);
}
}

Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

=============== =============== =============== =====
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=============== =============== =============== =====

This posting is provided "AS IS" with no warranties, and confers no
rights.