class Class1
{
static void ChineseGreeting(string name)
{
Console.WriteLine("早上好,",name);
}
static void EnglishGreeting(string name)
{
Console.WriteLine("Good morning,",name);
}
static void Main(string[] args)
{
GreeteManager gm = new GreeteManager();
gm.Delegate1 = ChineseGreeting; //把=换成+=并不会报错
gm.Delegate1 += EnglishGreeting;
gm.GreetPeople("zz");
Console.ReadKey();
}
}
public class GreeteManager
{
public delegate void GreetingDelegate(string name);
public GreetingDelegate Delegate1;
public void GreetPeople(string name)
{
if (Delegate1 != null)
{
Delegate1(name);
}
}
}
为什么结果是这样的,还有就是当我把第一个 = 改为 += ,并不会报错,仍能得出和原来一样的结果,这又是为什么。
代码是照着http://www.tracefact.net/CSharp-Programming/Delegates-and-Events-in-CSharp.aspx ,边学边敲,验证性学习