Question

I have seen generic repository pattern here. I am trying to add generic select clause that i want to send as argument from calling function. I modified

public T GetSingle(Expression<Func<filter, bool>> filter) to 
public T GetSingle(Expression<Func<filter, bool>> filter,Expression<Func<T, T>> Selct)

Now I want to call this method. How should i send my select expression

return rep.GetSingle(p => p.Slug == slug,???)

Answer 1

Currently your method can’t change the result type. I suspect that’s not what you want. I would expect you’d want your method to be generic, e.g.

public TResult GetSingle<TResult>(Expression<Func<T, bool>> filter,
                                  Expression<Func<T, TResult>> projection)

You’d then call that with something like this:

// The type argument is inferred from the second lambda expression
string x = repository.GetSingle(p => p.Slug == slug, p => p.FirstName);