Question

I have the following repository that I use for unit testing:

public class MyTestRepository<T>
{
    private List<T> entities = new List<T>();

    public IQueryable<T> Entities
    {
        get { return entities.AsQueryable(); }
    }

    public T New()
    {
        //return what here???
    }

    public void Create(T entity)
    {
        entities.Add(entity);
    }

    public void Delete(T entity)
    {
        entities.Remove(entity);
    }
}

What do I return in the New() method?

I have tried this:

    public T New()
    {
        return (T) new Object();
    }

But that gives me the following exception when I run my unit test:

System.InvalidCastException: Unable to cast object of type 'System.Object' to type 'MyCustomDomainType'.

Any idea on how to implement the New() method?

Answer 1

You could add a constraint for the T type parameter:

public class MyTestRepository<T> where T : new() 

and return new T(); in the method.