I have an abstract class BaseItem declared like this: public abstract class BaseItem { public BaseItem Parent { get; protected set; } public List<BaseItem> Children = new List<BaseItem>(); public abstract string Function1(); } Basically, i'm trying to implement a design where each Item has a parent that will be of...
I am working on a client (Silverlight) interface to a collection of webmethod. And I am trying to avoid writing any custom code for every webmethod. So I have created a ServiceCall<TResult> to handle each call, TResult specifies the return type of the service (I use XmlSerializer to create the returned instance). The client class exposes...
How can I convert/dump an arraylist into a list? I'm using arraylist because I'm using the ASP.NET profiles feature and it looked like a pain to store List in profiles. Note: The other option would be to wrap the List into an own class and do away with ArrayList. http://www.ipreferjim.com/site/2009/04/storing-generics-in-asp-net-profi...
I'm trying to create a generic LINQ-TO-SQL repository based on this post which basically lets you define a generic base repository class, then you can define all of your actual repository classes by deriving from the generic base. I want the option of using a repository with or without passing in the data context, so I decided to create...
I am working with tree's in java and I have the following interface for a simple unordered tree with a self reference: public interface Node<N extends Node> { public N getParent(); public void setParent(N parent); public Collection<N> getChildren(); public void addChild(N node); public void removeChild(N node); public N ...
Say I have an interface and some classes: public interface IPanel<ComponentType extends Component> { public void addComponents(Set<ComponentType> components); public ComponentType create(); } public class Button extends Component { } public class LocalizedButton extends Button { } public class ButtonsPanel implements IPanel<But...
I have next code: private T CreateInstance<T>(object obj) // where T : ISomeInterface, class { ... if (!typeof(T).IsAssignableFrom(obj.GetType())) { throw ..; } return (T)obj; } Can it be replaced with this: T result = obj as T; if (result == null) { throw ..; } return result; If not - why? ...
I am designing a simple Data Access Object for my Java application. I have a few classes (records) that represents a single row in tables like User and Fruit. I would like to have a single method for getting all records of a specific type. For the moment I have it like this: public List<User> getAllUsers() { ... } public List<Fruit>...
I have a function which takes a generic: public static ShowTrackChangesViewModel CreateVM<T>(IList<TrackChanges> TrackChanges, T entity) { //How do i access T properties ? } T here is an entityFramework object. How do i cast it back to the real one to access its property ? Do i need to write a big if code...
I've done some fancy wrapping to avoid unchecked warnings in the past, but after 90 mins of poring over http://www.angelikalanger.com/GenericsFAQ/JavaGenericsFAQ.html, I can't write the findMatch method below and make it work without @SuppressWarnings("unchecked"). The parameterized class isn't known at compile time. public interface ...
I think the title should explain it all but just in case... I want to know what risks and potential issues relating to casting can arise from the following snippet of Java code: List<? extends MyObject> wildcardList = someAPI.getList(); List<MyObject> typedList = (List<MyObject>) wildcardList; My thoughts are that all objects in the ...
How remove the: Type safety: The expression of type List[] needs unchecked conversion to conform to List<Object>[] compiler warning in the following expression: List<Object>[] arrayOfList = new List[10]; ...
I have a generic class, class ComputeScalar<T> : IComputeVariable where T : struct { // This is why i have to use generics. ComputeBuffer<T> buffer; T data; } class ComputeArray<T> : IComputeVariable where T : struct { // This is why i have to use generics. ComputeBuffer<T> buffer; T[] data; } and i use this class...
How can i achieve this? public class GenericClass<T> { public Type getMyType() { //How do I return the type of T? } } Everything I have tried so far always returns type Object rather than the specific type used. Thanks a lot. ...
I have a problem with bounded nested wildcards in Java generics. Here's a common case: public void doSomething(Set<? extends Number> set) {} public void callDoSomething() { Set<Integer> set = new HashSet<Integer>(); doSomething(set); } This is standard Java generics, works fine. However if the wildcard becomes nested, it ...
It was such a simple, brilliant idea. Use the power of Java 5.0 enumerated types to encode details of a data dictionary (attribute name, type, range, units, etc.) and create a type-safe system for setting and reading attribute values (i,.e., attribute AAH is short, ACC is enumerated and should only accept the values ACC001, ACC002, ACC00...
The following code throws an ExecutionEngineException when I run the release build executable (start exe file). Is this a bug or is it normal behavior? value type with pack size = 1: [StructLayout(LayoutKind.Sequential, Pack = 1)] public struct RunLong { public byte Count; public long Value; public RunLong(byte count, long...
I have a fairly simple DAL assembly that consists of an SalesEnquiry Class which contains a List<T> of another Vehicle class. We'll be receiving XML files by email that I'm wanting to use to populate instances of my SalesEnquiry class, so I'm trying to use de-serialization. I've added XMLRoot/XMLElement/XMLIgnore attributes to both cla...
I have a collection of objects which I pass as parameter to create objects of another type (one for one). I am doing this in many places (basically converting from data objects to business objects). I want to write a generic extension method to accomplish this. But I am stuck because I don't know how I can specify constraint that busines...
Hello everybody, I have an old personal project written in Java 1.4 that I am porting to 1.5 (in which I am a still newbie) for version 2. Besides adding new features to it and refactoring code, I am also migrating to generic collections, annotations etc. There is a particular piece of code that I don't know how to change to 1.5 and do...