C # Use of Indexer

I recently came into contact with indexer. Generally speaking, indexer refers to something similar to a property defined in a class. The indexer is a new class member in. net. Similar to class attributes. Some people simply call it an attribute with parameters.

The indexer can quickly locate a group member in a class. Next let's take a lookCode:

Indexer

 Class  Indexerclass
{
  Private     Int  [] Arr  =  New     Int  [  100 ];
  Private     String  [] Names  =  New     String  [  100  ];
  Public     Int     This  [ Int  Index]
{
  Get  
{
  If  (Index  <     0     |  Index  > =     100  )
{
  Return    -  1  ;
}
  Else  
{
  Return  Arr [Index];
}
}
  Set  //  The get and set methods of the indexer are compiled by the compiler into the get_item and sge_item methods.  
  {
  If  (Index  > = 0     &&  Index  <     100  )
{
Arr [Index]  =  Value;
}
}
}
  Public     Int     This  [ String  Key]  //  The indexer parameter is also a string, not necessarily an int.  
  {
  Get  
{
  Return  Getnumber (key );
}
}
  Public     Int  Getnumber (  String  Gender)
{
 If  (Gender  =     "  Boy  "  )
{
  Return     1  ;
}
  Else     If  (Gender  =    "  Girl  "  )
{
  Return     0  ;
}
  Else  
{
  Return     -  1  ;
}
}
} 

Most of the index parameters are 'int' type, but they can also be other types, such as 'string.

 Static    Void  Main (  String  [] ARGs)
{
Indexerclass indexertest  =     New  Indexerclass ();
  For  (  Int  I  =     0  ; I <     10  ; I  ++  )
{
Indexertest [I]  =  I  +     2  ;  //  For class objects, you can operate the arrays in the objects just like an array.  
  }
  For (  Int  I  =     0  ; I  <     10  ; I  ++  )
{
Console. writeline (indexertest [I]);
}
Console. readkey ();
}