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New Message on BDOTNET
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From: Nasha
Message 1 in Discussion
Hi, We all know about class indexers. Well you can also have indexers in
interfaces. Interface indexers differ from class indexers in the following ways :-
Interface accessors do not use modifiers. An interface accessor does not
have a body. The purpose of the accessor is to indicate whether the indexer is
read-write, read-only, or write-only. The following is an example of an interface
indexer: 1. Open a new console project.
2. Create two interfaces i.e. Interface1 and Interface2 (as shown below in the code).
3. Implement the indexer in each of the interfaces as shown below.
3. Create a class called as MyClass(as shown below) which implements these two
Interfaces. Code : class MyClass:Interface1,Interface2
{
private int[] ArrayofStrings=new int[100];
public MyClass()
{
} public int this[int index] // Interface1
{
get
{
return ArrayofStrings[index];
}
set
{
ArrayofStrings[index]=value;
}
}
string Interface2.this[int index]
{
get
{
return ArrayofStrings[index].ToString() + " String";
}
}
} public class MainClass
{
public static void Main()
{
MyClass o = new MyClass();
o[1] = 1; // interface1
Console.WriteLine(((Interface2)o)[1].ToString()); // Interface2
Console.ReadLine();
}
} public interface Interface1
{
int this[int index]
{
get;
set;
}
}
public interface Interface2
{
string this[int index]
{
get;
} } You will notice that this class has two indexers one coming from the
Interface1 and other coming from Interface2. Indexer function for Interface1 has the
access modifier as "public" whilst the indexer for Interface2 is private.
Since the access modifier for indexer of Inferface1 is public you can access it
directly from the main as you would have accessed any other class indexer. But you
will notice that along with indexer for Interface1 you can also access the indexer for
interface2 by type casting because the Interface2 is public. Hence in this way you
can have multiple indexers in a class using Interface Indexers.
-- Please post your queries and comments for my articles in the usergroup for the
benefit of all. I hope this step from my end is helpful to all of us.
Regards,
Namratha (Nasha)
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