C#学习笔记之三（delegate, event, Make XML document

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delegates:
   // 1. nomal delegates = create before run, in main
//declare
class Employee{}; class Couple{}

public delegate bool Reverse(object lhs, object rhs);
SetOrder(Reverse the delegatedFunction) {}
//init
Couple.Reverse employeeByID = new Couple.Reverse(Employee.SecondIDLower)
Couple employees = new Couple(joe, fred);
employees.SetOrder(employeeByID);

// 2.static delegates = create it before run, static readonly
// it will oppcupy memory
class Employee {
  public static readonly Couple.Reverse EmployByID =
   new Couple.Reverse(Employee.SecondIDLower);
}
// call
employees.SetOrder(Employee.EmployByID);
// 3. delegates as propeties = create when use it
// save memory
class Employee {
  public static Couple.Reverse EmployeeByID {
   get {return new Couple.Reverse(Employee.SecondIDLower);}
  }
}
// 4. Muticast delegates
// must return void
public class delegateClass {
  public delegate void Stringdelegate(string s);
  public void Display(Stringdelegate d, string s
  {
   d(s);
  }
}
//declare
delegateClass.Stringdelegate Writer, Logger, Storer;
//init
Writer = new delegateClass.Stringdelegate(Employee.WriteString);
Logger = new delegateClass.Stringdelegate(Employee.LogString);
Storer = new delegateClass.Stringdelegate(Employee.StoreString);
...
public static void WriteString(string s) {}
DeletegateClass.Stringdelegate mutiCast;
mutiCast = Writer + Logger;
mutiCase += Storer;
mutiCast -= Logger;
// call muticast delegates
thedelegateClass.Display(mutiCast, joe.ToString);

event:
//OfficeWatcher will subscrib Office's event
public class OfficeWatcher()
{
  //subscriber Office event
  public OfficeWatcher(Office)
  {
   office.OfficeChanged +=
    new Office.OfficeChangedHandler(OnOfficeChanged);
  }
  //OnOfficeChanged will call when Office changed
  public void OnOfficeChanged(object sender, Office eventArgs e) {}
}
//It will needed by NotifyOfficeChanged, hold data need to let
//subscribers know
public class OfficeeventArgs: eventArgs {}

public class Office {
  //declare delegate, event will use it
  public delegate void OfficeChangedHandler(object sender,
  OffeventArgs e);
  //declare event
  public event OfficeChangedHandler OfficeChanged;
  //This method will go through event OfficeChanged event and
  //find who has subscribed this event, and let them know
  protected virtual void NotifyOfficeChanged(OfficeeventArgs e){}
  if (OfficeChanged != null) OfficeChanged(this, e);
  }
  ...
  public this[int index]
  {
   ...
   OfficeeventArgs e new OfficeeventArgs(ctr);
   //Notify subscribers Office has changed
   NotifyOfficeChanged(e);
  }
}

XML document:
1. generate XML comments in code using /// comments
2. 项目属性-->配置属性-->生成-->输出-->XML文档文件
3. ctrl+shift+B 生成项目, 这时生成XML文档
4. 工具-->生成注释web页，这时生成html文件