Question

Is it possible to create a method which returns a lambda expression? I couldn’t find any proper examples.

The following syntax doesn’t work, of course. It’s just to visualize my idea a bit:

// Executed code
var filteredList = listWithNames.Where(GetLambdaExpression("Adam"));

// method
public Expression GetLambdaExpression(string name)
{
    return listElement => listElement.Name == name;
}

Answer 1

You can create functions which return expressions such as this as a simple example in a predicate builder:

public static Expression<Func<T, bool>> True<T>() { return param => true; }

or this expression builder:

static Expression<T> Compose<T>(this Expression<T> first, Expression<T> second, Func<Expression, Expression, Expression> merge)
        {
                      var map = first.Parameters
                .Select((f, i) => new { f, s = second.Parameters[i] })
                .ToDictionary(p => p.s, p => p.f);

             var secondBody = ParameterRebinder.ReplaceParameters(map, second.Body);

             return Expression.Lambda<T>(merge(first.Body, secondBody), first.Parameters);
        }

in your example case You should use what Leppie has mentioned below (which I have upvoted)

<Func<TypeOflistElement,bool>>