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class Program { static void Main() { MyClass mc = new MyClass(); Console.WriteLine("Max: {0}", mc.ReturnMaxSum(30)); Console.WriteLine("Max: {0}", mc.ReturnMaxSum(5)); } }
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CHAPTER 6 MORE ABOUT CLASSES
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If you were to define class Employee, with three fields of type string (as shown in Figure 6-14), you could access the fields using their names, as shown in the code in Main.
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Figure 6-14. Simple class without indexers There are times, however, when it would be convenient to be able to access them with an index, as if the instance were an array of fields. This is exactly what indexers allow you to do. If you were to write an indexer for class Employee, method Main might look like the code in Figure 6-15. Notice that instead of using dot-syntax notation, indexers use index notation, which consists of an index between square brackets.
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Figure 6-15. Using indexed fields
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An indexer is a set of get and set accessors, similar to those of properties. Figure 6-16 shows representations of an indexer for a class that can get and set values of type string.
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Figure 6-16. Representations of an indexer
Indexers and Properties
Indexers and properties are similar in many ways. Like a property, an indexer does not allocate memory for storage. Both indexers and properties are used primarily for giving access to other data members with which they are associated, and for which they provide set and get access. A property is usually accessing a single data member. An indexer is usually accessing multiple data members.
Note You can think of an indexer as a property that gives get and set access to multiple data members of the class. You select which of the many possible data members by supplying an index, which itself can be of any type not just numeric.
Some additional points to be aware of when working with indexers are the following: An indexer can have either one or both of the accessors. Indexers are always instance members; hence, an indexer cannot be declared static. Like properties, the code implementing the get and set accessors does not have to be associated with any fields or properties. The code can do anything, or nothing, as long as the get accessor returns some value of the specified type.
CHAPTER 6 MORE ABOUT CLASSES
Declaring an Indexer
The syntax for declaring an indexer is shown following. Notice the following about indexers: An indexer does not have a name. In place of the name is the keyword this. The parameter list is between square brackets. There must be at least one parameter declaration in the parameter list. Keyword Parameter list ReturnType this [ Type param1, ... ] { get Square brackets { ... } set { ... } } Declaring an indexer is similar to declaring a property. Figure 6-17 shows the syntactic similarities and differences.
Figure 6-17. Comparing an indexer declaration to a property declaration
CHAPTER 6 MORE ABOUT CLASSES
The set Accessor
When the indexer is the target of an assignment, the set accessor is called, and receives two items of data, as follows: An implicit parameter, named value, where value holds the data to be stored One or more index parameters that represent where it should be stored emp[0] = "Doe"; Index Value Parameter Your code in the set accessor must examine the index parameters, determine where the data should be stored, and then store it. The syntax and meaning of the set accessor are shown in Figure 6-18. The left side of the figure shows the actual syntax of the accessor declaration. The right side shows the semantics of the accessor if it were written using the syntax of a normal method. The figure on the right shows that the set accessor has the following semantics: It has a void return type. It uses the same parameter list as that in the indexer declaration. It has an implicit value parameter named value, of the same type as the indexer.
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