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Demos/DemoFunc.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+public class DemoFunc
+{
+    private Func<int> intFunc;
+
+    private Func<T> AsFunc<T>(T input)
+    {
+        return () => input;
+    }
+
+    private T Exec<T>(Func<T> func)
+    {
+        return func();
+    }
+
+
+    public void ContrivedMethod()
+    {
+        Func<string> helloWorldFunc = AsFunc("Hello World!");
+        var helloWorld = Exec(helloWorldFunc);
+        // helloWorld == "Hello World!"
+        
+        intFunc = AsFunc(1);
+        var one = Exec(intFunc);
+        // one == 1);
+    }
+
+
+    public void SomewhatMoreRealisticMethod()
+    {
+        // cant use var - because we need to tell the compiler what we'll describe
+        Func<IEnumerable<BooksByAuthor>, string, bool> authorExists =
+            (booksByAuthor, authorName) => booksByAuthor.Any(ba => ba.Author == authorName);
+
+
+        Func<IEnumerable<BooksByAuthor>, string, BooksByAuthor> getGataloguedAuthor =
+            (booksByAuthor, authorName) => {
+                // can do complex stuff or help in debugging
+                return booksByAuthor.FirstOrDefault(ba => ba.Author == authorName);
+            };
+
+
+        var bas = Enumerable.Empty<BooksByAuthor>();// for conciceness
+
+        var exits = authorExists(bas, "Homer");
+
+        var homersBooks = getGataloguedAuthor(bas, "Homer");
+    }
+}