Hi. Can someone tell my why this gives a compile error? I don't see why the cast to A in the second for-loop causes strings() to return a general List of Objects. import java.util.ArrayList; import java.util.List; public class E { public static void main(String[] args) { for (String s : new D().strings()) { Sys...
I have written a List`1 editor template for use with the EditorFor extension methods (MVC2), however I am running into issues when using generics + null objects. Given a model class MyModel { public Foo SomeFoo { get;set; } public List<Foo> SomeFooList { get;set; } } and a template in /Views/Shared/EditorTemplates/List`1.ascx ...
I am using Filehelpers to import my database from files. I am now working on the reverse process and am having trouble seeing how to create the records from my data objects. All the examples I can find show going from file -> table -> file I am using interfaces with generics to convert. I use this one on the inbound conversion: publi...
It happens to see Collections.<Object>asList(...) method invocations in the code, but Eclipse seems do not understand this(with my configuration) and shows this as compilation error. Is my Eclipse configuration wrong? Or this doesn't work with Sun compiler (jdk 1.6.013)? What should I check / enable for thing like this? ...
Pretty basic question in C#, class Data<T> { T obj; public Data() { // Allocate to obj from T here // Some Activator.CreateInstance() method ? obj = ??? } } Not sure how to do this ? Thank you for any assistance. ...
Why do I get a compile time error on this piece of code? public Interface Location { ....... } Class code... Map<Type, List<? extends Location>> locationsTypeMap = new HashMap<Type, List<? extends Location>>(); /** Code to add elements to the hashMap. */ newLocation = getNewLocation() while(mapHasElements){ Location....
Hi! the title probably is misleading, but i didn't really know how to name it. let's say I have the following structs template <typename T> struct SillyBase{ void doFunnyStuff(vector<T> vec){ dummyField = T(); for(int i=0; i<10; i++) vec.push_back(dummyField++); } T dummyField; }; struct A : pu...
I have a class as such public class MyClass<T> where T: OneType { T MyObj {get;set;} public MyCLass(T obj) { } } public class SubClass: MyClass<TwoType> { } // snip for other similar class definition where, TwoType is derived from OneType. Now, I have this utility method public static MyClass<T> Factory<T>(T vd) w...
I am trying to implement the observer pattern with a slight twist, the Subject and Observer are the same class. For example, class myclass { public delegate void UpdateHandler(object sender); public event UpdateHandler UpdateEvent; public Attach(myclass obj){ // use delegate to attach update function of obj} public Update(ob...
I'm getting the following compiler error Cannot convert type 'T' to 'ProjectReportingHandler' for the line var projectReport = (ProjectReportingHandler)result.Report; when trying to compile: public abstract class ReportingHandler { // Report stuff } public abstract class ProjectReportingHandler: ReportingHandler { //...
Possible Duplicate: Why cant I catch a generic exception in C#? I have been reviewing and writing Circuit Breaker code recently. The following method compiles, but the catch block is never entered. I have plenty of work-arounds, and this isn't the only way to get the right behavior (filtering exceptions), but I'm curious why thi...
I must honestly say that I do not really understand much about casting, but I thought this would work. I have a Generic Class Test: public class Test<T,U> { T variable1; U variable2; //etc. } I need to use this class in a WPF view, and since you can't create generic views in WPF (how lovely) I thought: lets just use a...
I have a generic class that I need to constrain to only value types (int, float, etc.). I have a method that calls the Parse method based on a test of the type. For example: class MyClass<T> { ... private static T ParseEntry(string entry) { if(typeof(T) == typeof(float)) { return (T) float.Pars...
I am trying to serialize a List<MyObject>. When I create my XmlSerializer as such: XmlSerializer xmlSerializer = new XmlSerializer(List<MyObject>); I get the following error: Ambiguous Constructor Reference How can I fix this so I can serialize and deserialize my list? ...
In a test method (for a Fluent NHibernate mapping, although that's not really relevant) I have the following code wrapped in a bunch of usings and try/catch blocks: new PersistenceSpecification<Entry>(session) .CheckProperty(e => e.Id, "1") .VerifyTheMappings(); I would like to refactor this so that I can pass it to a helper m...
(C#, VS2008) In a program I'm working on, I've got lots of objects that all have an ID and implement IComparable so that List<>-s of the various objects are easily searchable by ID. Since I hate copy/pasting code, I thought I'd abstract that bit of functionality down to a base class, like so: using System; namespace MyProg.Logic { ...
Hi there, Why doesn't this compile? I suppose there are ways to work around this; just curious. Thanks! static void Main(string[] args) { Func<int, int> f_int = n => n * n; Func<int, double> f_double = (Func<int, double>)f_int; } ...
How to write a generic method in Java. In C# I would do this public static T Resolve<T>() { return (T) new object(); } Whats the equivalent in Java? ...
In code behind file of the main window of WPF application I have a method quering a database with LINQ to SQL and writing results to an ObservableCollection: public void GetStateByDate(string shcode) { MydbDataContext contextSts = new MydbDataContext(); _ShAvaQuCollection.Clear(); var sts = from p in co...
I'm looking for the best way to make it possible to get a random element from a List where the T's will be objects of different types that is not related via a base class. I've been loooking at creating an extension method to List, or a helper method that recieves a List, but I haven't been able to get it together. Each time I've run in...