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New Message on BDOTNET
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From: rajesh_mr
Message 2 in Discussion
Hi
An indexer enables you to treat an object like an array.It helps you to acces
the arrays in a class using the class name. Indexer enables you to use bracket
notation ([]) with an object to set and get a value from an object.They
encapsulate method calls into more convenient representation of value access
and value setting.
public dataType this[int index]
{
get
{
//Code to get some value from a array
if (index < 0)
return "negative";
else if (index > max)
return "Infinity";
else
return arr[index];
}
set
{
arr[index]=value;
}
}
Indexers makes your code more readable and easier to understand.
You can create mulltiple indexers for a class. Signature of each indexer
should be unique. The signature of an indexer is considered as the number and
types of its formal parameters return data type of the indexer is not part of
signature.
They help you to represent as array values which may have no similarities
to arrays as internal representation.
You are not limited to using integers as indexes. You can use strings to
achieve the result used in the Hash class and many others.
Use indexer only when the representation of the class data as multiple objects
is proper.
Regards
Rajesh
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