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c#abstract-classderived-class
Richard B. Sorensen
Richard B. Sorensen

Reputation: 111

C# routine to create derived classes from an abstract class

I am trying to develop a routine that will run an sql statement and use the results to populate class objects that are derived from an abstract class, something like the following:

public static List<T> PopulateList<T>(string sql)
{
    List<T> list = new List<T>();
    // get sql data
    foreach (row in resultset)
    {
        list.Add(new T(row));
    }
    return list;
}

The constructor of the abstract class (i.e., "T") calls an abstract/virtual method which, of course, would be overidden and potentially different for each derived class.

The problem is that C# won't allow an abstract class object to be created and populated even though it represents and will be used for a derived class object.

How can I accomplish this?

I have tried to design the routine but haven't figured out a way to get it to work.

Upvotes: 0

Views: 71

Answers (1)

Lajos Arpad
Lajos Arpad

Reputation: 76943

The problem is that C# won't allow an abstract class object to be created and populated even though it represents and will be used for a derived class object.

Yes indeed. So you have MyAbstractClass with some abstract methods. You can implement a class that extends your MyAbstractClass and implements the abstract methods in some dummy manner and use this MyDerivedClass instead.

Upvotes: 0

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