Indexer (programming)
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In object-oriented programming, an indexer allows instances of a particular class or struct to be indexed just like arrays.[1] It is a form of operator overloading.
Implementation
[edit]Indexers are implemented through the get and set accessors for the operator[]. They are similar to properties, but differ by not being static, and the fact that indexers' accessors take parameters. The get and set accessors are called as methods using the parameter list of the indexer declaration, but the set accessor still has the implicit value parameter.
Example
[edit]Here is a C# example of the usage of an indexer in a class: [2]
class Family { private List<string> _familyMembers = new List<string>(); public Family(params string[] members) { _familyMembers.AddRange(members); } public string this[int index] { // The get accessor get => _familyMembers[index]; // The set accessor with set => _familyMembers[index] = value; } public int this[string val] { // Getting index by value (first element found) get => _familyMembers.FindIndex(m => m == val); } public int Length => _familyMembers.Count; } Usage example:
void Main() { var doeFamily = new Family("John", "Jane"); for (int i = 0; i < doeFamily.Length; i++) { var member = doeFamily[i]; var index = doeFamily[member]; // same as i in this case, but it demonstrates indexer overloading allowing to search doeFamily by value. Console.WriteLine($"{member} is the member number {index} of the {nameof(doeFamily)}"); } } In this example, the indexer is used to get the value at the nth position, and then to get the position in the list referenced by its value. The output of the code is:
John is the member number 0 of the doeFamily Jane is the member number 1 of the doeFamily
See also
[edit]References
[edit]- ^ jagadish980 (2008-01-29). "C# - What is an indexer in C#". SURESHKUMAR.NET FORUMS. Archived from the original on September 22, 2009. Retrieved 2011-08-01.
{{cite web}}: CS1 maint: numeric names: authors list (link) - ^ "C# Interview Questions". .net Funda. Retrieved 2011-08-01.
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