private static void FilterExample()
{
var l = Enumerable.Range(0, 9).ToList();
ListUtil.Filter(l, i => i > 5);
Console.WriteLine("Enter number 0..9");
var k = Console.ReadKey().KeyChar - '0';
Console.WriteLine();
Console.WriteLine("Anonymous filter (>)");
ListUtil.Filter(l, i => i > k);
Console.WriteLine();
Console.WriteLine("Delegate filter (<)");
//k++;
Func <int, bool> filterFun =
delegate(int i)
{
return(i < k);
};
ListUtil.Filter(l, filterFun);
k++;
ListUtil.Filter(l, filterFun);
}
static void Main(string[] args)
{
var words = new List <string>()
{
"1", "12", "123", "1234", "12345", "12346", "1234567"
};
Console.Write("Maximum length of string to include? ");
int userMaxLength = int.Parse(Console.ReadLine()); // userMaxLength scope is in Main
MyPredicate <string> predicate = item => item.Length < userMaxLength; // we create an anonymous method that uses a variable decalred outside of itself
IList <string> shortWords = ListUtil.Filter(words, predicate); // this method is passed to another method
ListUtil.Dump(shortWords); // and userMaxLength int is still available
//Console.WriteLine("Changing the value of the scoped variable within the predicate:");
//userMaxLength = 0;
//MyPredicate<string> predicate2 = item => { userMaxLength++; return item.Length <= userMaxLength; };
//IList<string> shortWords2 = ListUtil.Filter(words, predicate2);
//ListUtil.Dump(shortWords2);
}