class Chat{
public User who;
public string SayWhat;
public DateTime SayTime;
....
public Chat(User w,string sayWhat){
this.who=w;
this.sayWhat=sayWhat;
}
}
class User{
public string uid;
private string pwd;
public string name;
public string info;
public DateTime loginTime;
...//等等属性
public User(string u,string p){
this.uid=u;
this.pwd=p;
}
public User(){