C# 0 The Complete Reference

set

 or 

get

 accessor can be modified, not both. Furthermore, the access modifier must 

be more restrictive than the access level of the property or indexer. Finally, an access 

modifier cannot be used when declaring an accessor within an interface or when implementing 

an accessor specified by an interface. (Interfaces are described in Chapter 12.)

Using Indexers and Properties

Although the preceding examples have demonstrated the basic mechanism of indexers and 

properties, they haven’t displayed their full power. To conclude this chapter, a class called 

RangeArray

 is developed that uses indexers and properties to create an array type in which 

the index range of the array is determined by the programmer.

As you know, in C# all arrays begin indexing at zero. However, some applications would 

benefit from an array that allows indexes to begin at any arbitrary point. For example, in 

some situations it might be more convenient for an array to begin indexing with 1. In another 

situation, it might be beneficial to allow negative indexes, such as an array that runs from –5 

to 5. The