I would be certain that this question addresses something that would have been brought up in a previous question, but I was unable to find it.
There is a method in a C# class that takes as a parameter a generic List of a Base Class. I need to pass a list of an inherited class and do not know exactly how to do this. I am getting an error in my attempts. Below is sample code to illustrated this:
public class A
{
public static void MethodC(List<A>)
{
// Do Something here with the list
}
}
public Class B : A
{
// B inherits from A, A is the Base Class
}
// Code utilizing the above method
List<B> listOfB = new List<B>();
A.MethodC( (List<A>) listOfB ); // Error: this does not work
A.MethodC( listOfB.ToList<typeof(A)>() ); // Error: this does not work
A.MethodC( listOfB.ConvertAll<A>(typeof(A)) ); // Error: this does not work
// how can I accomplish this? It should be possible I would think
Note: Here is my final working Method as a reference. I got an even better solution to my problem, but technically it wasn't an answer to the question, since my question was phrased impropertly.
public static DataTable
ObjectCollectionToDataTable<GLIST>
(List<GLIST> ObjectCollection) where GLIST
: BaseBusinessObject
{
DataTable ret = null;
if (ObjectCollection != null)
{
foreach ( var b in ObjectCollection)
{
DataTable dt = b.ToDataTable();
if (ret == null)
ret = dt.Clone();
if (dt.Rows.Count > 0)
ret.Rows.Add(dt.Rows[0].ItemArray);
}
}
return ret;
}