//через as
void UseOne2(One one)
{
Two two = (one as Two);
if (two != null && two.SomeBool == false)
{
two.Display();
}
else
{
Console.WriteLine("Преобразование не удалось");
}
}
//через try catch
void UseOne3(One one)
{
try
{
Two two = (Two)one;
if (two.SomeBool == false)
{
two.Display();
}
}
catch (InvalidCastException e)
{
Console.WriteLine(e.Message);
}
}
// через is
void UseOne1(One one)
{
if (one is Two)
{
Two two = (Two)one;
if (two.SomeBool == false)
{
two.Display();
}
}
else
{
Console.WriteLine("Преобразование не удалось");
}
}