31 lines
622 B
C#
31 lines
622 B
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Linq.Expressions;
|
|
|
|
class Person
|
|
{
|
|
public int Age { get; set; }
|
|
}
|
|
|
|
class Repro
|
|
{
|
|
public static int Main ()
|
|
{
|
|
var persons = GetPersons (new [] { new Person { Age = 25 }, new Person { Age = 21 } }, 25);
|
|
return persons.Count () - 1;
|
|
}
|
|
|
|
static IEnumerable<T> GetPersons<T> (IEnumerable<T> persons, int age) where T : Person
|
|
{
|
|
foreach (var person in persons)
|
|
if (Test (person, p => p.Age == age))
|
|
yield return person;
|
|
}
|
|
|
|
static bool Test<T> (T t, Expression<Func<T, bool>> predicate)
|
|
{
|
|
return predicate.Compile () (t);
|
|
}
|
|
}
|