static void Main(string[] args)
{
MyGenericList <string> collection = new MyGenericList <string>();
collection.Add("Anna");
collection.Add("Bertil");
collection.Add("Cecilia");
collection.Add("David");
collection.Add("Academy");
collection.Add("ITHS");
collection.Add("Newton");
collection.Add("Bowers & Wilkins");
collection.Add("Kvarnskogen");
// Testing foreach
foreach (var item in collection)
{
Console.WriteLine(item);
}
Console.WriteLine("-----------------------------------------");
// Testing for
for (int i = 0; i < collection.Count; i++)
{
Console.WriteLine(collection[i]);
}
Console.WriteLine("-----------------------------------------");
// Testing non deferred version of Where
var q1 = collection
.Where_NonDeferred(s => s.Length <= 5);
foreach (var item in q1)
{
Console.WriteLine(item);
}
Console.WriteLine("-----------------------------------------");
// Testing deferred version of Where
var q2 = collection
.Where_Deferred(s => s.Length <= 5);
foreach (var item in q2)
{
Console.WriteLine(item);
}
Console.WriteLine("-----------------------------------------");
// Testing Sum
var q3 = collection
.Sum(new Func <string, int>(ReturnLength /*s => s.Length*/));
Console.WriteLine($"Total number of characters: {q3}");
Console.WriteLine("-----------------------------------------");
}
public static IEnumerable <T> Where_NonDeferred <T>(this IEnumerable <T> collection, MyFunc <T, bool> method)
{
MyGenericList <T> tmp = new MyGenericList <T>();
foreach (var item in collection)
{
if (method(item))
{
tmp.Add(item);
}
}
return(tmp);
}