static void Main(string[] args)
{
//SortedSet<Person> sortPerson = new SortedSet<Person>(new ComparePerson()) {
// new Person(){ index = 1},
// new Person(){ index = 0},
// new Person(){ index = 2}
//};
//foreach (var i in sortPerson)
//{
// Console.WriteLine(i.index);
// ObservableCollection<Person> obp = new ObservableCollection<Person>() {
// new Person(){ index = 11},
// new Person(){ index = 9}
// };
// obp.CollectionChanged += OnCollectionChanged;
// obp.Add(new Person() { index = 10 });
//}
//string[] words = { "cherry", "apple", "blueberry", "devision", "format", "empty" };
//string[] digits = { "zero", "1", "two", "three", "four", "five",
//"six", "seven", "eight", "nine" };
//int shortestWordLength = words.Min(w => w.Length);
//var rs = digits.Where((digit, index) => digit.Length < index);
////Console.WriteLine(shortestWordLength);
//foreach (var r in rs) {
// Console.WriteLine(r);
//}
Op op = new Op(Opreateion);
IAsyncResult optask = op.BeginInvoke("end invoke", 1, null, null);
while (!optask.IsCompleted)
{
Console.WriteLine("main thread is running ...");
Thread.Sleep(500);
}
Console.Write("call back {0}", op.EndInvoke(optask));
Console.ReadLine();
}