static void Main(string[] args)
{
string[] inputs = { "This", " is ", " a ", " very ", " fine ", " wine!" };
ICommand c = new ConcatCommand(inputs);
string results = (string)c.Execute();
Console.WriteLine(results);
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("Generic Classes and Methods");
// basics
var r = new ResultFromClosed <string>(); // T is string even though its base class T is int
// non-static generic classes
// cache<T>
// string message = "Generics are fun!";
// var cache = new Cache<string, string>(); // per instance (thus per key/value type combination)
// string key = "fun-message";
// cache.AddOrUpdate(key, message);
// string cachedResult = cache.Get(key);
// Console.WriteLine(cachedResult);
// string message2 = "Lazy loading is fun, too.";
// string message2key = "lazy-message";
// Cache.Global.AddOrUpdate(message2key, message2); // essentially as singleton
// object cachedResult2 = Cache.Global.Get(message2key); // note: no strong typing
// Console.WriteLine(cachedResult2);
// working with generics that have a generic base class and non-generic analogs
string[] inputs = { "Follow ", "Steve ", "on ", "Pluralsight.com ", "to ", "get ", "updates!" };
ICommand <string> c = new ConcatCommand(inputs); // can replace with ICommand<string>
string results = c.Execute(); // which eliminates the cast here
Console.WriteLine(results);
// counters -- these are not threadsafe
BaseClass.GlobalCounter += 10;
Generic <int> .Counter += 5;
Generic <string> .Counter += 7;
Console.WriteLine($"Counts: {BaseClass.GlobalCounter} {Generic<int>.Counter} {Generic<string>.Counter}");
Generic <int> .GlobalCounter += 5;
Generic <string> .GlobalCounter += 5;
Console.WriteLine($"Counts: {BaseClass.GlobalCounter} {Generic<int>.Counter} {Generic<string>.Counter}");
var intInstance = new Generic <int>();
intInstance.AnotherCounter++;
Console.WriteLine($"Counts: {BaseClass.GlobalCounter} {Generic<int>.Counter} {Generic<string>.Counter}");
intInstance.LocalCounter++;
var stringInstance = new Generic <string>();
stringInstance.LocalCounter++;
Console.WriteLine($"Counts: int: {intInstance.LocalCounter} string: {stringInstance.LocalCounter}");
// using the non-generic command with just objects
var stuff = new Object[] { 1, "hey", 4.3 };
var collectCommand = new CollectCommand(stuff);
var collectResult = (List <object>)collectCommand.Execute();
// Console.WriteLine(String.Join(',', collectResult
// .Select(o => o.ToString()).ToArray()));
// static classes/methods
//string result = Converter.Convert("input"); // type arguments cannot be inferred
string result0 = Converter.Convert <string, string>("input"); // must specify every type
string result = ConvertTo <string> .Convert("input"); // only need to specify output type
// extension methods -- cover in methods section
string someMessage = "";
Console.WriteLine($"Is message not empty? {someMessage.ToArray().WhereNotEmpty()}");
Console.WriteLine($"Is message default? {someMessage.IsDefault()}");
Console.WriteLine($"Is 0 default? {0.IsDefault()}");
// swap - extension method
int a = 1;
int b = 2;
a.Swap <int>(ref b); // specify type
Console.WriteLine($"a: {a},b: {b}");
a.Swap(ref b); // type inferred by argument
// a and b should be back to original values
Console.WriteLine($"a: {a},b: {b}");
// swap strings
string one = "one";
string two = "two";
// one.Swap(ref two); // Error - not a struct
// static data access - not recommended typically
IEnumerable <Customer> customers = DataAccess <Customer> .List();
}
