C# Language Idioms - Effective C# - page 5

public class Customer
{
public virtual string Name
{
get ;
protected set ;
}
// remaining implementation omitted
}
The property syntax extends beyond simple data fields. If your type should
contain indexed items as part of its interface, you can use indexers (which
are parameterized properties). It's a useful way to create a property that
returns the items in a sequence:
public int this [ int index]
{
get { return theValues[index]; }
set { theValues[index] = value ; }
}
// Accessing an indexer:
int val = someObject[i];
Indexers have all the same language support as single-item properties:
They are implemented as methods you write, so you can apply any verifi-
cation or computation inside the indexer. Indexers can be virtual or
abstract, can be declared in interfaces, and can be read-only or read-write.
Single-dimension indexers with numeric parameters can participate in
data binding. Other indexers can use noninteger parameters to define
maps and dictionaries:
public Address this [ string name]
{
get { return adressValues[name]; }
set { adressValues[name] = value ; }
}
In keeping with the multidimensional arrays in C#, you can create multi-
dimensional indexers, with similar or different types on each axis:
public int this [ int x, int y]
{