Help with collection class!!!!

M

mr_zack

Newcomer
Joined
Feb 12, 2003
Messages
9
Location
Houston
Hello,

I need some help implementing a collection class. I don't understand some of the methods I need to implement.

I have marked the methods I need help with as such:
??? What do I do here?


Here is what I have:

public class ParamsCollection : System.Collections.CollectionBase
{

public ParamsCollection()
{
}

public new int Count
{
get
{
return List.Count;
}
}


public override bool Equals(object obj)
{
return false;
??? What do I do here?

}


public override int GetHashCode()
{
return 0;
??? What do I do here?

}



public override string ToString()
{
return null;
??? What do I do here?

}


public new void Clear()
{
??? What do I do here? Should this remove all objs from col?

}


public new System.Collections.IEnumerator GetEnumerator()
{
return null;
??? What do I do here?

}


public new System.Type GetType()
{
return null;
??? What do I do here? Should this return the type of object in collection?

}


public new void RemoveAt(int pIndex)
{
List.RemoveAt(pIndex);
}


public void Add(Parameter pParameter)
{
List.Add(pParameter);
}

public Parameter this[int pIndex]
{
get
{
return (Parameter)List[pIndex];
}
set
{
List[pIndex] = value;
}
}


}
 
When you inherit from a class such as CollectionBase, you do not
need to override every single member like you need to do when
implementing an interface.

For example, the Clear method of the base class will clear the
List collection, so you don't need to override it, unless you want to
add some extra functionality.

ToString could return whatever you want it to... it could be a
string representing the class's type, or it could be a delimited
string returning all the elements in the collection, for example.

GetType simply returns your class's type... As far as I can tell, it
can't be overriden (in VB.NET at least, since GetType is a keyword).

For the Equals function, compare each element in the collection
passed to it to return a true value if everything matches up.
Otherwise, return false. Again, the base class probably will
handle this just fine.

The same holds true for GetHashCode, and any other method
you're not sure of; if you don't know what to put, then let the
base class deal with it.

Although I'm sure someone here will follow up with some better
ideas for the overrides... :)
 
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