CLR Via CSharp----------Delegate&Lambda

CLR Via CSharp----------Delegate&Lambda

 

1. There are some simple samples of how to use the delegate。

 1     class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5 
 6             String[] names = { };
 7 
 8             Counter(1, 3, null);
 9             Counter(1, 4, Conso);
10             Counter(1, 4, Mess);
11 
12             Program p = new Program();
13             Counter(1, 4, new FeedBack(p.Conso2));
14 
15             FeedBack f1 = new FeedBack(Conso);
16             FeedBack f2 = new FeedBack(Mess);
17 
18             FeedBack f = null;
19             f += f1;
20             f += f2;
21             Counter(1, 30, f);
22         }
23 
24         private static void Counter(int from, int to, FeedBack fb)
25         {
26             for (int i = from; i < to; i++)
27                 if (fb != null)
28                     fb(i);
29         }
30 
31         private static void Conso(int value)
32         {
33             Console.WriteLine("Item=" + value.ToString());
34         }
35 
36         private void Conso2(int value)
37         {
38             Console.WriteLine("Item=" + value.ToString());
39         }
40 
41         private static void Mess(int value)
42         {
43             MessageBox.Show("Item=" + value.ToString());
44         }
45 
46         private void Mess2(int value)
47         {
48             MessageBox.Show("Item=" + value.ToString());
49         }
50     }

2. There are much better practices.

1             String[] names = { "Jeff", "Kristin", "Aidan", "Grant", "HaifengCai" };
2             Char charToEnd = 'a';
3             names = Array.FindAll(names, name => name.IndexOf(charToEnd) >= 0);
4             names = Array.ConvertAll(names, name => name.ToUpper());
5             Array.ForEach(names, Console.WriteLine);

 

posted @ 2014-11-08 21:19  TRHFC  阅读(240)  评论(0)  编辑  收藏  举报