命名的方法 匿名方法 对委托进行实例化

命名方法对委托实例

// Declare a delegate
delegate void Del(int i, double j);
class MathClass
{
static void Main()
{
MathClass m = new MathClass();
// Delegate instantiation using "MultiplyNumbers"
Del d = m.MultiplyNumbers;
// Invoke the delegate object.
System.Console.WriteLine("Invoking the delegate using 'MultiplyNumbers':");
for (int i = 1; i <= 5; i++)
{
d(i, 2);
}
}
// Declare the associated method.
void MultiplyNumbers(int m, double n)
{
System.Console.Write(m * n + " ");
}
}

匿名方法与命名方法 实例 比较

[code]// Declare a delegate
delegate void Printer(string s);
class TestClass
{
static void Main()
{
// Instatiate the delegate type using an anonymous method:
Printer p = delegate(string j)
{
System.Console.WriteLine(j);
};
// Results from the anonymous delegate call:
p("The delegate using the anonymous method is called.");
// The delegate instantiation using a named method "DoWork":
p = new Printer(TestClass.DoWork);
// Results from the old style delegate call:
p("The delegate using the named method is called.");
}
// The method associated with the named delegate:
static void DoWork(string k)
{
System.Console.WriteLine(k);
}
}

输出

[code]The delegate using the anonymous method is called.

The delegate using the named method is called.