How to get value from IEnumerable collection using its Key?

Question

I have IEnumerable collection like following

IEnumerable<Customer> items = new Customer[] 
{ 
     new Customer { Name = "test1", Id = 999 }, 
     new Customer { Name = "test2", Id = 989 } 
};

I want to get value using key Id

I tried like following

public int GetValue(IEnumerable<T> items,string propertyName)
{
      for (int i = 0; i < items.Count(); i++)
      {
           (typeof(T).GetType().GetProperty(propertyName).GetValue(typeof(T), null));
           // I will pass propertyName as Id and want all Id propperty values 
           // from items collection one by one.
      }
}

Answer 1

If you want to retrieve a Customer name from a collection by its Id:

public string GetCustomerName(IEnumerable<Customer> customers, int id)
{
    return customers.First(c => c.Id == id).Name;
}