$$$ public event MyDelegate OnOccurUseDelegate; 这行的event有什么用?

namespace ConsoleApplication1

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{

public delegate void MyDelegate(string abc);

class ClassA

{

public event MyDelegate OnOccurUseDelegate; //这行的event可用可不用

public event EventHandler OnOccurUseEventHandler;//这行的event可用可不用

public void Run()

{

Console.WriteLine("ClassA Run()");

Console.WriteLine("invoke the Onccur");

OnOccurUseDelegate("OnOccurUseDelegate");

OnOccurUseEventHandler(this, EventArgs.Empty);

}

}

class ClassB

{

public ClassB(ClassA a)

{

a.OnOccurUseDelegate += new MyDelegate(Run);

a.OnOccurUseEventHandler += new EventHandler(Run);

}

private void Run(string abc)

{

Console.WriteLine(abc);