Question

I have a function that is declared like so:

public static string MultiWhereToString(List<WhereCondition<T>> whereConditions)

I am trying to pass it a variable called whereAnd which is delcared like so:

private List<WhereAndCondition<T>> whereAnd = new List<WhereAndCondition<T>>();

WhereAndCondition is a sub class of WhereCondition. It is declared like so:

public class WhereAndCondition<T> : WhereCondition<T>, IConditional where T : DatabaseObject

My issue is, if I try to execute the following code:

private List<WhereAndCondition<T>> whereAnd = new List<WhereAndCondition<T>>();
MultiWhereToString(whereAnd);

I get the following error:

Error 3 Argument 1: cannot convert from 'System.Collections.Generic.List<BrainStorm.WhereAndCondition<T>>' to 'System.Collections.Generic.List<BrainStorm.WhereCondition<T>>'

Any ideas on why? I think it has to do with the generics of the WhereCondition classes.

Answer 1

I would suggest using interfaces:

public static string MultiWhereToString(IEnumerable<ICondition<T>> whereConditions)

This would allow you a lot more freedom when calling this method.