public void GreetPeople(string name)
{
MakeGreet(name);
MakeGreet = null;
var delegateList = MakeGreet?.GetInvocationList();
//foreach (var d in delegateList)//need to check if delegateList is null or not(complier is not smart enough)
foreach (var d in delegateList != null?delegateList:new GreetingDelegate[0])
{
d.ToString();
}
if (delegateList != null)
{
var delArray = MakeGreet.GetInvocationList();
foreach (var del in delArray)
{
try
{
//EventHandler method = (EventHandler)del;
//method(this, EventArgs.Empty);
del.DynamicInvoke(this, EventArgs.Empty);//a more commonly function, applies to all types of delegate
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
}
public void Greet(string name)
{
//if (MakeGreet != null)
// { //如果有对象注册
// MakeGreet(name); //调用所有注册对象的方法
// }
MakeGreet?.Invoke(name);//简化上面的写法
}
public void Greet(string name, MakeGreet makeGreet)
{
makeGreet(name);
}
public void GreetPeople(string name)
{
MakeGreet?.Invoke(name);
}
public void Greet(string name, MakeGreet makeGreet)
{
makeGreet(name);
}
