C# Func

using FancLinq; public class Program { public static void Main(string[] args) { var nums = new int[] {1,2,3,4,5,6,7}; var str = nums.Select((value) => SelectMethod(value)) .ToList(); str.ForEach(System.Console.WriteLine); var str2 = nums.Select((value1, value2) => SelectMethod(value1, value2)) .ToList(); str2.ForEach(System.Console.WriteLine); // MY Select ------------------ var str3 = nums.MySelect(SelectMethod) .ToList(); str3.ForEach(System.Console.WriteLine); } public static string SelectMethod(int arg1) { return string.Format($"sonlar : {arg1}"); } public static string SelectMethod(int arg1, int arg2) { return string.Format($"son : {arg1} index : {arg2}"); } } 

namespace FancLinq; public static class LinqExtensions { public static IEnumerable<TResult> MySelect<T1,TResult>(this IEnumerable<T1> collection, Func<T1,TResult> callback) { // var result = new List<TResult>(); foreach(var num in collection) { // result.Add(callback.Invoke(num)); yield return callback.Invoke(num); } // return result; } } 

sonlar : 1 sonlar : 2 sonlar : 3 sonlar : 4 sonlar : 5 sonlar : 6 sonlar : 7 son : 1 index : 0 son : 2 index : 1 son : 3 index : 2 son : 4 index : 3 son : 5 index : 4 son : 6 index : 5 son : 7 index : 6 sonlar : 1 sonlar : 2 sonlar : 3 sonlar : 4 sonlar : 5 sonlar : 6 sonlar : 7