.net中用Action等委托向外传递参数

     一般我们可以使用ref,out达到向外传递参数目的。 Action<T>是一个特殊的委托，除了常规应用。我们还可以用它来实现简单地向外传递参数。直接看下面的UnitTest代码:

1: [TestMethod]

void PassOutParametersUsingDelegate()

   3: {

int i = 0;

string.Empty;

int? addedNumber = 1;

   7:  

//It is pass parameter by Action<T1,T2>

   9:     Foo1((a, b) =>

  10:     {

  11:         i = a;

  12:         messgae = b;

  13:     });

  14:  

//It is pass parameter by Func<T1,T2,TResult>

  16:     Foo2((a, b) =>

  17:     {

  18:         i = a;

  19:         messgae = b;

return addedNumber;

  21:     });

  22:  

  23:     Foo2((a, b) =>

  24:     {

return a+100;

  26:     });

  27:  

, i, messgae));

  29:  

  30:  

  31: }

  32:  

string> action)

  34: {

int number = 15;

;

  37:  

  38:     action(number, msg);

  39: }

  40:  

int?> func)

  42: {

int number = 15;

;

  45:  

int? tempInt = func(number, msg);

  47: }