c#类里面,再定义类是什么意思,有什么好处吗?
using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication2
{
public class Center
{
private string message;
public string address = "Beijing";
public delegate void SendMessageEventHandler(object sender, SendMessageEventArgs e);
public event SendMessageEventHandler SendMessage;
public class SendMessageEventArgs : EventArgs
{
public readonly string message;
public SendMessageEventArgs(string message)
{
this.message = message;
}
}
protected virtual void OnSendMessage(SendMessageEventArgs e)
{
if (SendMessage != null)
{
SendMessage(this, e);
}
}
}
}
我可以把SendMessageEventArgs 类放到外面来定义吗