Implement index indicator in C #

An index indicator is essentially a parameter-included attribute, which is used in a similar way as an array. However, the index indicator parameter is not limited to int, and string can also be: Myweek =   New Myweek ();
For ( Int I =   1 ; I <= Myweek. length; I ++ )
{
Console. writeline (myweek [I]);
}

The following is a simple example:

1. myweek class

///   <Summary>
/// The essence of an index indicator is that it contains parameter attributes,
/// The parameter is not limited to int, and can be a string.
///   </Summary>
Public   Class Myweek
{
Public   Int Length
{
Get { Return   7 ;}
}

///   <Summary>
/// Use int as the index indicator of the Parameter
///   </Summary>
///   <Param name = "Index"> </param>
///   <Returns> </returns>
Public   String   This [ Int Index]
{
Get
{
String Dayname;
Switch (Index)
{
Case   1 :
Dayname =   " Monday " ;
Break ;
Case   2 :
Dayname =   " Tuesday " ;
Break ;
Case   3 :
Dayname =   " Wednesday " ;
Break ;
Case   4 :
Dayname =   " Thursday " ;
Break ;
Case   5 :
Dayname =   " Friday " ;
Break ;
Case   6 :
Dayname =   " Saturday " ;
Break ;
Case   7 :
Dayname =   " Sunday " ;
Break ;
Default :
Dayname =   "" ;
Break ;
}
Return Dayname;
}
}

///   <Summary>
/// Use string as the index indicator of the Parameter
///   </Summary>
///   <Param name = "dayname"> </param>
///   <Returns> </returns>
Public   Int   This [ String Dayname]
{
Get
{
Dayname = Dayname. tolower ();
Switch (Dayname)
{
Case   " Monday " :
Return   1 ;
Case   " Tuesday " :
Return   2 ;
Case   " Wednesday " :
Return   3 ;
Case   " Thursday " :
Return   4 ;
Case   " Friday " :
Return   5 ;
Case   " Saturday " :
Return   6 ;
Case   " Sunday " :
Return   7 ;
Default :
Return   - 1 ;
}
}
}
}

2. Usage

Myweek =   New Myweek ();
For ( Int I =   1 ; I <= Myweek. length; I ++ )
{
Console. writeline (myweek [I]);
}
String Dayname;
For ( Int I =   1 ; I <= Myweek. length; I ++ )
{
Dayname = Myweek [I];
Console. writeline (myweek [dayname]. tostring ());
}

3. output results
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
1
2
3
4
5
6
7

RelatedArticle: Implement the foreach Function

Address: http://www.cnblogs.com/anjou/archive/2007/07/06/808206.html