<\/div>\n

Bu yaz\u0131mda C#’ta indexer yap\u0131lar\u0131ndan bahsedece\u011fim.\u00d6ncelikle yap\u0131n\u0131n ne oldu\u011fundan bahsedeyim.Asl\u0131nda \u00e7o\u011fu yerde kulland\u0131\u011f\u0131m\u0131z yap\u0131lard\u0131r.Dizilerde indeks numaras\u0131na g\u00f6re \u00e7al\u0131\u015f\u0131rken,SqlDataReader nesnesinde kolonlar\u0131 \u00e7ekerken ya da bir koleksiyonda elemanlar\u0131m\u0131za ula\u015f\u0131rken kullan\u0131r\u0131z.Mesela SqlDataReader’dan \u00f6rnek vereyim.SqlDataReader dr ad\u0131nda bir nesnemiz olsun ve bu SqlDataReader’a \u00e7ekilmi\u015f verilerden istedi\u011fim kolona nas\u0131l ulabilirim.dr[“kolonadi”] \u015feklinde.\u0130\u015fte bu yap\u0131lar\u0131 olu\u015fturmay\u0131 g\u00f6sterece\u011fim.
\n
\nINDEXER<\/strong><\/span>
\nBildi\u011fimiz propertyler gibi get ve set bloklar\u0131 vard\u0131r.Class i\u00e7indeki bir dizi ya da koleksiyon yap\u0131s\u0131n\u0131n elemanlar\u0131n\u0131 vermeye ya da set etmeye yararlar.
\n\u015eimdi a\u015fa\u011f\u0131daki \u00f6rne\u011fi inceleyiniz.<\/p>\n

\r\n    class Indexer\r\n    {\r\n        int[] sayilar = new int[5];\r\n        public int this[int index]\r\n        {\r\n            get\r\n            {\r\n                return sayilar[index];\r\n            }\r\n            set\r\n            {\r\n                sayilar[index] = value;\r\n            }\r\n        }\r\n    }\r\n<\/pre>\nYukar\u0131daki kodlar\u0131 incelerseniz e\u011fer, sayilar ad\u0131nda int dizisi tan\u0131mlanm\u0131\u015ft\u0131r ve 5 elemanl\u0131d\u0131r.(Ben sadece yap\u0131y\u0131 teorik olarak g\u00f6steriyorum.Basit ama anla\u015f\u0131l\u0131r.)Indexer yap\u0131s\u0131 propertylere \u00e7ok benzer.Tek fark this[] s\u00f6zc\u00fc\u011f\u00fcndedir.Indexer\u0131m\u0131z\u0131n parametresine g\u00f6nderdi\u011fimiz int tipindeki de\u011fer, sayilar dizisinde o de\u011fere kar\u015f\u0131l\u0131k gelen indeks numaral\u0131 elemana gidecektir.Gerekli get ve set i\u015flemini o indekste yapacakt\u0131r.Indexer’a isim vermeyiz.Bu \u015fekilde olu\u015fturulurlar.
\n\u015eimdi kullan\u0131m\u0131n\u0131 g\u00f6relim.<\/p>\n
\r\n            Indexer deneme = new Indexer();\r\n            deneme[0] = 3;\r\n            deneme[3] = 4;\r\n            MessageBox.Show(deneme[0] + " " + deneme[3]);\r\n<\/pre>\nYukardaki kodu izah edelim.Indexer s\u0131n\u0131f\u0131ndan deneme referans\u0131 yarat\u0131l\u0131yor ve bu referansa Indexer nesnesi ba\u011flan\u0131yor.
\ndeneme[] yazd\u0131\u011f\u0131m\u0131z zaman, k\u00f6\u015feli parantez i\u00e7ine girilen say\u0131 Indexer s\u0131n\u0131f\u0131nda olu\u015fturdu\u011fumuz Indexer\u0131m\u0131za gidiyor ve oradaki sayilar dizininde, o de\u011fere denk gelen indeks numaral\u0131 eleman\u0131 se\u00e7iyor.deneme[0] = 3 ve deneme[3] = 4 yazd\u0131\u011f\u0131m zaman, set blo\u011funda bu veriler se\u00e7ilen elemanlara aktar\u0131l\u0131yor.Bunlar\u0131 okumaya kalkt\u0131\u011f\u0131m\u0131zda da get blo\u011fu \u00e7al\u0131\u015f\u0131yor.Ve se\u00e7ilen elemanlar\u0131n de\u011ferleri g\u00f6nderiliyor.(\u0130sterseniz di\u011fer indeksleride doldurabilirsiniz.)<\/p>\n
Indexer yap\u0131lar\u0131 Overload edilebilirler.Tek \u015fart parametreleri farkl\u0131 olmal\u0131d\u0131r.Bunuda a\u015fa\u011f\u0131daki kodlarla \u00f6rnekleyelim.<\/p>\n
\r\n        public int this[int index]\r\n        { }\r\n        public int this[string elemanadi]\r\n        { }\r\n        public string this[double deneme]\r\n        { }\r\n<\/pre>\nYukar\u0131da g\u00f6rd\u00fc\u011f\u00fcn\u00fcz gibi bir s\u0131n\u0131f\u0131n indexer\u0131n\u0131 overload yapt\u0131m.
\n\u015eimdilik bu kadar.Bir sonraki yaz\u0131mda g\u00f6r\u00fc\u015fmek \u00fczere.
\n\u0130yi \u00e7al\u0131\u015fmalar.<\/p>\n","protected":false},"excerpt":{"rendered":"
Bu yaz\u0131mda C#’ta indexer yap\u0131lar\u0131ndan bahsedece\u011fim.\u00d6ncelikle yap\u0131n\u0131n ne oldu\u011fundan bahsedeyim.Asl\u0131nda \u00e7o\u011fu yerde kulland\u0131\u011f\u0131m\u0131z yap\u0131lard\u0131r.Dizilerde indeks numaras\u0131na g\u00f6re \u00e7al\u0131\u015f\u0131rken,SqlDataReader nesnesinde kolonlar\u0131 \u00e7ekerken ya da bir koleksiyonda elemanlar\u0131m\u0131za ula\u015f\u0131rken kullan\u0131r\u0131z.Mesela SqlDataReader’dan \u00f6rnek vereyim.SqlDataReader dr ad\u0131nda bir...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[166],"class_list":["post-275","post","type-post","status-publish","format-standard","hentry","category-c-sharp-c","tag-indexer"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/275","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/comments?post=275"}],"version-history":[{"count":0,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/275\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media?parent=275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/categories?post=275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/tags?post=275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}