{"id":4678,"date":"2020-04-22T10:53:50","date_gmt":"2020-04-22T07:53:50","guid":{"rendered":"http:\/\/www.yazilimmutfagi.com\/?p=4678"},"modified":"2020-04-22T10:53:50","modified_gmt":"2020-04-22T07:53:50","slug":"linq-lambda-kullanim-notlari-2","status":"publish","type":"post","link":"https:\/\/www.yazilimmutfagi.com\/index.php\/2020\/04\/22\/linq-lambda-kullanim-notlari-2\/","title":{"rendered":"Linq, Lambda Kullan\u0131m Notlar\u0131 – 2"},"content":{"rendered":"\n

Bir \u00f6nceki makalenin<\/a> devam\u0131 olarak, bu makalede linq, lamda kullan\u0131m t\u00fcrlerine kald\u0131\u011f\u0131m\u0131z yerden devam ediyoruz. \u00d6nceki makale i\u00e7in t\u0131klay\u0131n\u0131z<\/a>.<\/em><\/p>\n\n\n\n

<\/p>\n\n\n\n

Her bir ifade i\u00e7in kullanaca\u011f\u0131m\u0131z \u00f6rnek tablo ve listeler:<\/strong><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
  • int[] Sayilar1 = new int[] { 1, 2, 3, 4, 5}<\/li>
  • int[] Sayilar2 = new int[] { 1, 3, 7, 7, }<\/li>
  • string[] Renkler= new string[] {“Beyaz”,”Mor”}<\/li><\/ul>\n\n\n

    <\/p>\n\n\n

    12 – Reverse<\/strong> Kullan\u0131m\u0131<\/strong> <\/h3>\n\n\n\n

    Listede bulunan elemanlar\u0131, tersten s\u0131ralayarak d\u00f6nd\u00fcrmeyi sa\u011flar.<\/p>\n\n\n\n

    \u00d6rnek Olarak: <\/p>\n\n\n\n

    IEnumerable SayiListesi  = Sayilar1.Reverse();<\/code><\/pre>\n\n\n\n
     Sonu\u00e7 : {5, 4, 3, 2, 1}<\/p>\n\n\n\n
    13 – First\/ FirstOrDefault Kullan\u0131m\u0131<\/strong> <\/h3>\n\n\n\n
    “First<\/strong>” komutu, liste i\u00e7indeki ilk eleman\u0131, “FirstOrDefault<\/strong>” ise, e\u011fer listede bo\u015f de\u011filse ilk eleman\u0131, liste bo\u015f ise varsay\u0131lan olarak “null<\/strong>” de\u011ferini d\u00f6nd\u00fcr\u00fcr. Bo\u015f bir liste i\u00e7in “first<\/strong>” komutu kullan\u0131l\u0131rsa, hata al\u0131n\u0131r.<\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.First();<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 : {1}  <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.FirstOrDefault(x => x>5);<\/code><\/pre>\n\n\n\n
     Sonu\u00e7 : null<\/p>\n\n\n\n
     14 – Last\/ LastOrDefault Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    “Last<\/strong>” komutu, liste i\u00e7indeki son eleman\u0131, “LastOrDefault<\/strong>” ise, e\u011fer liste bo\u015f de\u011filse son eleman\u0131, liste bo\u015f ise varsay\u0131lan olarak “null<\/strong>” de\u011ferini d\u00f6nd\u00fcr\u00fcr. Bo\u015f bir liste i\u00e7in “last<\/strong>” komutu kullan\u0131l\u0131rsa, hata al\u0131n\u0131r. <\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.Last();<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 : {5}  <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.LastOrDefault(x => x<3);<\/code><\/pre>\n\n\n\n
     Sonu\u00e7 : 2<\/p>\n\n\n\n
    <\/p>\n\n\n\n
     15 – Single\/ SingleOrDefault Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    “Single<\/strong>” komutu, liste i\u00e7indeki tek eleman\u0131 d\u00f6nd\u00fcr\u00fcr. E\u011fer listede birden fazla eleman varsa ya da liste bo\u015f ise hata d\u00f6nd\u00fcr\u00fcr. “SingleOrDefault<\/strong>” ise, e\u011fer listede bir tek eleman var ise bu eleman\u0131, liste bo\u015f ise “null<\/strong>” de\u011ferini , birden fazla eleman var ise hata d\u00f6nd\u00fcr\u00fcr. Bo\u015f bir liste i\u00e7in “single<\/strong>” komutu kullan\u0131l\u0131rsa hata al\u0131n\u0131r.  <\/p>\n\n\n\n
     16 –<\/strong> ElementAt \/ ElementAtOrDefault Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    “ElementAt<\/strong>” komutu, liste i\u00e7indeki belirtilen s\u0131radaki eleman\u0131, “ElementAtOrDefault<\/strong>” ise,  liste i\u00e7indeki belirtilen s\u0131radaki eleman varsa bu eleman\u0131, yoksa varsay\u0131lan olarak “null<\/strong>” de\u011ferini d\u00f6nd\u00fcr\u00fcr.  Bo\u015f bir liste i\u00e7in “elemanAt<\/strong>” komutu kullan\u0131l\u0131rsa hata al\u0131n\u0131r.  <\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.ElementAt(4);<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 : 4<\/p>\n\n\n\n
     \u00d6rnek Olarak ;<\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.ElementAtOrDefault(7);<\/code><\/pre>\n\n\n\n
     Sonu\u00e7 : null<\/p>\n\n\n
    <\/p>\n
    <\/p>\n
    <\/p>\n\n\n
     17 – Distinct Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    Liste i\u00e7erisindeki tekrarlayan elemanlar\u0131 sadece bir kez g\u00f6stererek listeler.<\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar2.Distinct();<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 :  {1, 3, 7}<\/p>\n\n\n
    \n<\/p>\n\n\n
     18 – Except Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    Liste i\u00e7erisindeki elemanlar\u0131, di\u011fer liste ile k\u0131yaslar ve farkl\u0131 olan elemanlar\u0131 bulur.<\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.Except(Sayilar2);<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 :  {2, 4, 5}<\/p>\n\n\n\n
    <\/p>\n\n\n\n
     19 – Intersect Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    \u0130ki farkl\u0131 liste i\u00e7ersinden, ayn\u0131 elelmanlar\u0131 bulmak i\u00e7in kullan\u0131l\u0131r.<\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.Intersect(Sayilar2);<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 :  {1, 3}<\/p>\n\n\n\n
    <\/p>\n\n\n\n
     20 – Union Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    \u0130ki farkl\u0131 listeyi birle\u015ftirir, tekrarlayan kay\u0131tlar\u0131 bir kez yazar .<\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.Union(Sayilar2);<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 :  {1, 2, 3, 4, 5, 7}<\/p>\n\n\n\n
     21 – Aggregate Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    Listedeki  t\u00fcm elemanlar\u0131 s\u0131rayla istenilen bir i\u015fleme tabi tutarak, bir de\u011fer elde etmek i\u00e7in 2 parametreli bir Lambda \u0130fadesi ile beraber kullan\u0131l\u0131r. \u0130stenirse bir \u00f6n de\u011fer ile birlikte kullan\u0131labilir.<\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.Aggregate((a, b) => a * b);<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 : 120<\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.Aggregate(10, (a, b) => a * b);<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 : 1200<\/p>\n\n\n\n
    <\/p>\n\n\n\n
     22 – Count Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    Listedeki elemanlar\u0131n say\u0131s\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr.<\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable CityCount  = City.Count();<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 :  6<\/p>\n\n\n
    <\/p>\n
    \n<\/p>\n\n\n
     23 – Sum Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    Listedeki say\u0131lar\u0131n toplam\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr.<\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.Sum();<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 :  15<\/p>\n\n\n
    <\/p>\n
    <\/p>\n
    <\/p>\n\n\n
     24 – Max \/ Min<\/strong> Kullan\u0131m\u0131 <\/strong><\/h3>\n\n\n\n
    “Max<\/strong>” ifadesi listedeki en b\u00fcy\u00fck say\u0131y\u0131, “Min<\/strong>” ifadesi ise listedeki en k\u00fc\u00e7\u00fck say\u0131y\u0131 d\u00f6nd\u00fcr\u00fcr.<\/p>\n\n\n\n
     \u00d6rnek Olarak: <\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar2.Max();<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 : 7<\/p>\n\n\n\n
    IEnumerable SayiListesi  = Sayilar1.Min();<\/code><\/pre>\n\n\n\n
      Sonu\u00e7 : 1<\/p>\n\n\n
    <\/p>\n
    <\/p>\n
    <\/p>","protected":false},"excerpt":{"rendered":"
    Bir \u00f6nceki makalenin devam\u0131 olarak, bu makalede linq, lamda kullan\u0131m t\u00fcrlerine kald\u0131\u011f\u0131m\u0131z yerden devam ediyoruz. \u00d6nceki makale i\u00e7in t\u0131klay\u0131n\u0131z. Her bir ifade i\u00e7in kullanaca\u011f\u0131m\u0131z \u00f6rnek tablo ve listeler: […]<\/p>\n","protected":false},"author":525,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[413],"tags":[6541,4229,4163,6542,6395,6538,4482,6520,6545,6535,5043,6546,6536,5745,6216,6286,6534,6547,6537,6543,5120],"_links":{"self":[{"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/posts\/4678"}],"collection":[{"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/users\/525"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/comments?post=4678"}],"version-history":[{"count":5,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/posts\/4678\/revisions"}],"predecessor-version":[{"id":4696,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/posts\/4678\/revisions\/4696"}],"wp:attachment":[{"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/media?parent=4678"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/categories?post=4678"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/tags?post=4678"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}