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What are indexers in C#?
An indexer allows an object to be indexed such as an array.
Let us see the syntax −
element-type this[int index] {
// The get accessor.
get {
// return the value specified by index
}
// The set accessor.
set {
// set the value specified by index
}
}The following is an example showing how to implement indexers in C# −
Example
using System;
namespace Demo {
class Program {
private string[] namelist = new string[size];
static public int size = 10;
public Program() {
for (int i = 0; i < size; i++)
namelist[i] = "N. A.";
}
public string this[int index] {
get {
string tmp;
if( index >= 0 && index <= size-1 ) {
tmp = namelist[index];
} else {
tmp = "";
}
return ( tmp );
}
set {
if( index >= 0 && index <= size-1 ) {
namelist[index] = value;
}
}
}
static void Main(string[] args) {
Program names = new Program();
names[0] = "Tom";
names[1] = "Jacob";
names[2] = "Jack";
names[3] = "Amy";
names[4] = "Katy";
names[5] = "Taylor";
names[6] = "Brad";
names[7] = "Scarlett";
names[8] = "James";
for ( int i = 0; i < Program.size; i++ ) {
Console.WriteLine(names[i]);
}
Console.ReadKey();
}
}
}Output
Tom Jacob Jack Amy Katy Taylor Brad Scarlett James N. A.
Updated on: 20-Jun-2020
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