[C#] Func(T, TResult) 대리자 사용법

delegate 예제와 Func(T, TResult) 대리자 예제등 몇 가지를 살펴보면..

delegate예제
using System; delegate string ConvertMethod(string inString); public class DelegateExample { public static void Main() { // Instantiate delegate to reference UppercaseString method ConvertMethod convertMeth = UppercaseString; string name = "Dakota"; // Use delegate instance to call UppercaseString method Console.WriteLine(convertMeth(name)); } private static string UppercaseString(string inputString) { return inputString.ToUpper(); } }


Func(<T, TResult>) 대리자 예제
using System; public class GenericFunc { public static void Main() { // Instantiate delegate to reference UppercaseString method Func<string, string> convertMethod = UppercaseString; string name = "Dakota"; // Use delegate instance to call UppercaseString method Console.WriteLine(convertMethod(name)); } private static string UppercaseString(string inputString) { return inputString.ToUpper(); } }


Func(<T, TResult>) 대리자 + delegate 예제
using System; public class Anonymous { public static void Main() { Func<string, string> convert = delegate(string s) { return s.ToUpper();}; string name = "Dakota"; Console.WriteLine(convert(name)); } }


Func(<T, TResult>) 대리자 + 람다 식 예제
using System; public class LambdaExpression { public static void Main() { Func<string, string> convert = s => s.ToUpper(); string name = "Dakota"; Console.WriteLine(convert(name)); } }

와우.. 점점 짧아지는 소스..
Func(<T, TResult>) 대리자 + 람다 식 쵝오!

샘플 하나
using System; using System.Collections; using System.Collections.Generic; using System.Linq; static class Func { static void Main(string[] args) { // Declare a Func variable and assign a lambda expression to the // variable. The method takes a string and converts it to uppercase. Func<string, string> selector = str => str.ToUpper(); // Create an array of strings. string[] words = { "orange", "apple", "Article", "elephant" }; // Query the array and select strings according to the selector method. IEnumerable<String> aWords = words.Select(selector); // Output the results to the console. foreach (String word in aWords) Console.WriteLine(word); } } /* This code example produces the following output: ORANGE APPLE ARTICLE ELEPHANT */


출처 : MSDN