[StrongTypes] Casting a SortedList Generic Class to a generic Class of base type.

Thu, 01 Jun 2006 23:46:40 -0700

Hello everyone, this is my first post so please bare with me.

I am trying to understand why I can't cast generic class to a class
of a base type. I have the following setup:
///////////////////////////////////////////////////////////////////
   public class Personnel_List<T> :
ProjectCentral.GlobalObjects.PersistentObject_List<Person_Abs> where
T : Person_Abs, iPerson
    {
    }


    public abstract class Person_Abs :
ProjectCentral.GlobalObjects.PersistentObject, Contacts.iPerson
    {
}


    public class Vendor_Person : Person
    {
}

    public class Contract_Person : Vendor_Person
    {
////////////////////////////////////////////////


Ok so now I have a contract class that has a property Personnel_List
which is

/////////////////////////////////////////////////////////////
    public class Contract :
ProjectCentral.GlobalObjects.PersistentObject, iContract
    {
        public
ProjectCentral.Contacts.Personnel_List<Contacts.Contract_Person>
Personnel_List
        {
            get
            {   if (this._Personnel_List == null)
                    this._Personnel_List = new
Personnel_List<Contract_Person>();

                return this._Personnel_List;
            }
            set
            {
                this.Personnel_List = value;
            }
        }

}
//////////////////////////////////////////////////////////////////


THen I have a usercontrol that I want to use everywhere to list
Personnel so I set up a property as follows:


//////////////////////////////////////////////////////////
    public Personnel_List<Person> DataSource
    {
        get { return (Personnel_List<Person>)
grdPersonnel.DataSource; }
        set {grdPersonnel.DataSource = value;}
    }
////////////////////////////////////////////////////////////


So when I try to do this it bombs on me:
///////////////////////////////////////////////////////////////
UcPersonnelList1.DataSource = ((Contract)
this.ContractDetail1.DataSource).Personnel_List;
////////////////////////////////////////////////////////////


Even if I try this:
///////////////////////////////////////////////////////////////
UcPersonnelList1.DataSource = (Personnel_List<Person>)((Contract)
this.ContractDetail1.DataSource).Personnel_List;
////////////////////////////////////////////////////////////



ANy help would be greatly appreciated. My boss is starting to look
at me like I don't know what I'm doing.











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