I want to create the following method which takes in a lambda expression and orders data by it. I can't seem to correctly set this up.
Would look something like this where ??? is the lambda expression:
public static MyList<T> PageAndSort<T>(this IEnumerable<T> data, ???)
Would be used like this:
MyList.PageAndSort(List<MyEntity> data, x=>x.ChildEntity.Name)
LINQ has a pretty similar method: OrderBy. Look at its signature and imitate it:
public static IOrderedEnumerable<TSource> OrderBy<TSource, TKey>(
this IEnumerable<TSource> source,
Func<TSource, TKey> keySelector
)
Applied to your case:
public static MyList<TSource> PageAndSort<TSource, TKey>(
this IEnumerable<TSource> data,
Func<TSource, TKey> keySelector
)
Func<T, TResult> is a delegate with one parameter of type T that returns a TResult.
Use Action<T> or Func<T> depending of if you require return param or not.
So:
public static MyList<T> PageAndSort<T>(this IEnumerable<T> data, Action<T> sortBy)
where T is replaced by the type you want to sort by, so sting etc.
Func<T> has no input, and Action<T> doesn't fit either, since you need a result that can be used as key for sorting.