我在一次采访中被问到这个问题，要么我患有脑锁，要么只是愚蠢，但我没有答案。
我们需要事件的几个原因：
下面的例子：
Class Printer
{
public event EventHandler Print;
public void Start()
{
OnPrint();
}
protected virtual void OnPrint()
{
Print?.Invoke(this,EventArgs.Empty);
}
}
class Program
{
static void Main(string[] args)
{
//When Print is an EventHander
var printer = new Printer();
printer.Print += PrintEvent;
printer.Start();
//If Print was a delegate this is possible, else you get compile time errors
printer.Print(null,null); // Events will not allow to have a direct invoke
printer.Print = null; //You cannot assign a null to an Event Handler
}
private static void PrintEvent(object sender, EventArgs e)
{
System.Console.WriteLine("Printing event");
}
}
本文收集自互联网，转载请注明来源。
如有侵权，请联系[email protected] 删除。
我来说两句