C#中的Action<>和Func<>

public delegate void myDelegate(string str);  
public static void HellowChinese(string strChinese)  
{  
    Console.WriteLine("Good morning," + strChinese);  
    Console.ReadLine();  
}  
 
myDelegate d = new myDelegate(HellowChinese);  
d("Mr wang");  
 

public static void HellowChinese(string strChinese)  
{  
    Console.WriteLine("Good morning," + strChinese);  
    Console.ReadLine();  
}  
 
Action<string> action = HellowChinese;  
action("Spring.");  

public static string HelloEnglish(string strEnglish)  
{  
    return "Hello." + strEnglish;  
}  
 
Func<string, string> f = HelloEnglish;  
Console.WriteLine(f("Srping ji"));  
Console.ReadLine();