You have a using System.Linq in the file where you have the extra options. This using brings in several extension methods that help with LINQ (see details on extensions methods here) 0 solved C# Enumerable over a type gives different options (Finding more options in a function) [closed]
See “What is an Interface?” http://docs.oracle.com/javase/tutorial/java/concepts/interface.html This will hopefully get you started with the basics you’re looking for. The start of the implementation would look something like the following… class Politician implements Speaker { public void speak() { // Method implementation } public void announce (String str) { // Method implementation } } class Lecturer … Read more
Yes, it’s a common practise in any OOP based language to use only the definition of an object so that implementation details can be changed at a later time Let’s say you have the following interface public interface ISearchProvider { ISearchResult Search(ISearchRequest request); } If you now implement a property inside your windows forms, that … Read more
object ServiceImplementation extends MyService[String] { … } would be an example. solved Scala extends Java Interface with type
Using explicit implementation of interfaces, you can do something like: public interface IMyClass { object this[int index] { get; set; } } public class MyClass : IMyClass { public string this[int index] { get { return “”; } set { } } object IMyClass.this[int index] { get { return “”; } set { } } … Read more
I found this searching SO: Why should we declare an interface inside a class? Thus, when dealing with some hierarchy, you can describe a “nested” interface, which will be implemented by the wrapping class’s subclasses. In the JDK, the most significant example would be Map.Entry inner interface, defined within Map interface and implemented by various … Read more