Hi All, I have created a couple of simple functions in VB.NET that simply return a control of a certain type that I already know, such as HtmlInputHidden, Label, etc. That means that each of the functions is created only for that special purpose. What I'd like to do is combine all those functions into one function using generics. The...
I am not sure if this is a duplicate question to this one mainly because I'm a bit new to generics, so please be forgiving. I have a generic class: public class MyGeneric<T extends Collection> { private Class<T> genericType; public MyGeneric() { // Missing code here } } My question is this: how do I initializ...
Hi Guys, Came across the following MS Unit Test: [TestMethod] public void PersonRepository_AddressCountForSinglePerson_IsNotEqualToZero() { // Arrange. Person person; // Act. person = personRepository.FindSingle(1); // Assert. Assert.AreNotEqual<int>(person.Addresses.Count, 0); } I have never seen the use of gene...
A part of my (C# 3.0 .NET 3.5) application requires several lists of strings to be maintained. I declare them, unsurprisingly, as List<string> and everything works, which is nice. The strings in these Lists are actually (and always) Fund IDs. I'm wondering if it might be more intention-revealing to be more explicit, e.g.: public class ...
This is my code: The ExecutorImp extends AbstractExecutor which extract the same execute logics of its implementers(ExecutorImp is one case),when calling the execute() method of ExecutorImp, it will call the method in its supertype,but the supertype (the AbstractExcutor) should know another class binding to the implementer(in the example...
I have an slsb holding my business logic, how do I use generics to change the following three methods into one generic method ? The first two are the same db, the third is a different database. Also do the methods require further annotation in relation to transaction ? @PersistenceContext(unitName = "db") private EntityManager myEntity...
Hey, Imagine we have following classes: public interface MyInterface<T> { List<T> getList(T t); } abstract class BaseClass<T extends Number> implements MyInterface<T> { @Override public List<T> getList(Number t) { return null; } } class ChildClass extends BaseClass<Integer> { @Override public List<Inte...
I'd like to do something like the following, but because T is essentially just a System.Object this won't work. I know T can be constrained by an interface, but that isn't an option. public class Vborr<T> where T : struct { public Vborr() { public T Next() { if ( typeof( T ) == typeof( Double ) ) { ...
I feel stupid asking this but I am. The line List<HasId> ids = list is giving a compile error in the following code: public class MyGarbageClass { public void myMethod(List<MyCompany> list){ List<HasId> ids = list; } interface HasId { int getId(); } class MyCompany implements HasId{ private...
Is the following java implementation of the visitor pattern using generics, general enough to be useful? (I suppose it is). Could it be improved in some way? It's important to be easily call-able using anonymous classes. Thanks. (Example of use): Vector<Number> numbers = new Vector<Number>(); numbers.add(new Double(1.2)); ...
interface Foo<T extends Number>{ } class Bar<T extends Number> implements Foo<T>{ } Why does the class have to be written that way instead of: class Bar<T extends Number> implements Foo<T extends Number>{ } Surely the second way is clearer. ...
public class MyGenerics<T extends Number>{ List<T> = new ArrayList<T>(); public void addToList(){ for (ListIterator<T> it; it.hasNext(); ){ it.next(); it.add(number()); } } public T number(){ return (T) 5*Math.pi; } } As far as I can tell, there is no way to tell the compiler "I promise...
HI: What is the generic type in java? Just for reduce the class cast exception? ALso, the K means "keys", V means "valuse", what about the E and T? For a generic class,for example: List, I understand it as that the list can only put object of String type,but I am not quite clear about the generic method: static <T> void fromArrayToCol...
I create base generic class with no fields with just one method public class Base<T> where T:class { public static T Create() { // create T somehow } } public class Derived1 : Base<Derived1> { } public class Derived2 : Base<Derived2> { } public class Program { bool SomeFunction() { // Here I need reference to...
Say I want to do something like public class Container<C extends Member> { public void foo() { C newC = new C(); } } I realize that this will not work, but what is the correct Java idiom for this? ...
I'm working through an exercise sheet regarding interfaces, generics and abstract classes in Java. No matter what way I seem to code it, the class Exercise1 won't work. The question asked are commented in the code. Any help would be appreciated, I'm not sure if the error is in the Exercise one code or the implementation of the interface ...
I think I can sum up the use of generics in Java in one word: type-safety. Can you conclude the use of templates in C++ in one word, please? ...
I am trying to write generic code for detaching a linq class. What I have currently is: public void Detach() { this.PropertyChanged = null; this.PropertyChanging = null; this.Categories = default(EntitySet<Categories>); this.Jobs = default(EntitySet<Jobs>); this.Tasks= default(EntitySet<Tasks>); } This is all fine...
So, I have a little problem here. Suppose I have: public class Repository<TEntity> where TEntity : class { public abstract void Add(TEntity entity); // ...and so on... } And now I want to define a contract class, like so: public class RepositoryContracts<TEntity> : Repository<TEntity> where TEntity : class { pub...
I have the following class: class CrmToRealTypeConverter : IConverter { #region IConverter Members public object Convert<T>(T obj) { return Convert(obj); } #endregion private DateTime? Convert(CrmDateTime obj) { return obj.IsNull == false ? (DateTime?)obj.UserTime : null; } priva...