Lambda expressions and expression trees

柔光的暖阳◎ 2021-12-24 12:43 284阅读 0赞

1. introducing the Func<…> delegate types

Here are the signatures
of all the Func delegate types:
public delegate TResult Func()
public delegate TResult Func(T arg)
public delegate TResult Func(T1 arg1, T2 arg2)
public delegate TResult Func
(T1 arg1, T2 arg2, T3 arg3)
public delegate TResult Func
(T1 arg1, T2 arg2, T3 arg3, T4 arg4)

Func is equivalent to a delegate type of the form
delegate int SomeDelegate(string arg1, double arg2)

Func < string > returnHello;
Func < string , string > returnContent;
Func < string , int > returnLength; 

  1.         returnHello  =  ()  =>  \{  return   " Hi David! " ; \};  
  2.         returnContent  =  ( string  text)  =>  \{  return  text; \};  
  3.         returnLength  =  ( string  text)  =>  \{  return  text.Length; \};  
  5.         Console.WriteLine(returnHello());  
  6.         Console.WriteLine(returnContent( " Hi David! " ));  
  7.         Console.WriteLine( " Length of content:  "   \+  returnLength( " Hi David! " ));

转载于:https://www.cnblogs.com/davidgu/archive/2011/09/12/2174132.html

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