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All the examples I can find about Func<> and Action<> are simple as in the one below where you see how they technically work but I would like to see them used in examples where they solve problems that previously could not be solved or could be solved only in a more complex way, i.e. I know how they work and I can see they are terse and powerful , so I want to understand them in a larger sense of what kinds of problems they solve and how I could use them in the design of applications. In what ways (patterns) do you use Func<> and Action<> to solve real problems? using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace TestFunc8282 { class Program { static void Main(string[] args) { //func with delegate Func<string, string> convert = delegate(string s) { return s.ToUpper(); }; //func with lambda Func<string, string> convert2 = s => s.Substring(3, 10); //action Action<int,string> recordIt = (i,title) => { Console.WriteLine("--- {0}:",title); Console.WriteLine("Adding five to {0}:", i); Console.WriteLine(i + 5); }; Console.WriteLine(convert("This is the first test.")); Console.WriteLine(convert2("This is the second test.")); recordIt(5, "First one"); recordIt(3, "Second one"); Console.ReadLine(); } } }

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