(Thanks everyone for the answers, here is my refactored example, in turn another StackOverflow question about the Single Responsibility Principle.) Coming from PHP to C#, this syntax was intimidating: container.RegisterType<Customer>("customer1"); until I realized it expresses the same thing as: container.RegisterType(typeof(Custome...
How can I instantiate the type T inside my InstantiateType<T> method below? I'm getting the error: 'T' is a 'type parameter' but is used like a 'variable'.: (SCROLL DOWN FOR REFACTORED ANSWER) using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace TestGeneric33 { class Program { ...
In an assembly loaded into the current AppDomain using Assembly.LoadFrom, I have the following code: [TypeConverter(typeof(EnumConverter<Shapes>))] public enum Shapes { Triangle, Square, Circle } The generic EnumConverter<T> is defined in the assembly returned by calling Assembly.GetEntryAssembly(). When I read the TypeConverte...
In this simplified example I have a generic class, and a method that returns a Map regardless of the type parameter. Why does the compiler wipe out the types on the map when I don't specify a type on the containing class? import java.util.Map; public class MyClass<T> { public Map<String, String> getMap() { return nu...
Please consider the following snippet: public interface MyInterface { public int getId(); } public class MyPojo implements MyInterface { private int id; public MyPojo(int id) { this.id = id; } public int getId() { return id; } } public ArrayList<MyInterface> getMyInterfaces() { ArrayLi...
I recently discovered a trick using casting by example to instantiate a generic with an anonymous type. http://brendanjerwin.com/development/dotnet/c-sharp/2009/03/19/anonymous-generics.html So, its a neat trick, but when would it be used? Any ideas? ...
In Java I might do this: class MyClass { private List<? extends MyInterface> list; public void setList(List<MyImpl> l) { list = l; } } ...assuming that (MyImpl implements MyInterface) of course. What is the analog for this in Scala, when using a Buffer? import java.lang.reflect._ import scala.collection.mutable._ class Sca...
Following on from this question, can someone explain the following in Scala: class Slot[+T] (var some: T) { // DOES NOT COMPILE // "COVARIANT parameter in CONTRAVARIANT position" } I understand the distinction between T+ and T in the type declaration (it compiles if I use T). But then how does one actually write a class whi...
Here is something that I find myself using from time to time and I just wanted to get some feedback on the merits of the practice. Lets say that I have a base class: abstract class RealBase { protected RealBase(object arg) { Arg = arg; } public object Arg { get; private set; } public abstract void DoThatThingY...
Need to have a type-safe bag of items that all implement a generic interface. The desire is to do something like: var stringItem = new IItem<string>(); var numberItem = new IItem<int>(); var items = new List<IItem<T>>(); //T of course doesn't accomplish what I want items.Add(stringItem); items.Add(numberItem); Something like: inter...
Some time ago I came across a table that listed the generic equivalents for C# 1 data types. This would be a handy reference to have around. Can anyone point me to this? E.g., instead of Hashtable use ... ...
I'm trying to create a form that will animate something while processing a particular task (passed as a delegate to the constructor). It's working fine, but the problem I'm having is that I can't instantiate a copy of my generic class if the particular method that I want to perform has a return type of void. I understand that this is by...
I've created the following class: [Guid("4469031d-23e0-483c-8566-ce978ccc9a6f")] class MyGenericContianer<BasicType> : SomeOtherContainer { } This causes the folowing two classes to have the same GUID: MyGenericContianer<int> x; MyGenericContianer<float> y; I need each specific type to have it's own GUID. How would you do this? ...
I'm looking through a generic list to find items based on a certain parameter. In General, what would be the best and fastest implementation? 1. Looping through each item in the list and saving each match to a new list and returning that foreach(string s in list) { if(s == "match") { newList.Add(s); } } return new...
Can someone explain to me why in .NET 2.0 if I have an interface, IPackable and a class that implements that interface, OrderItem, when I have a method that takes in a List, passing in a list of List does not work? Does anyone know how I could accomplish this functionality? Thanks Josh Code: public interface IPackable { do...
I have the following structure: abstract class Base { public abstract List<...> Get(); //What should be the generic type? } class SubOne : Base { public override List<SubOne> Get() { } } class SubTwo : Base { public override List<SubTwo> Get() { } } I want to create an abstract method that returns whate...
I am trying to implement an interface class, that contains a list of objects. How can I make the list generic, so that the implementing class defines the type of list: public interface IEntity { Guid EntityID { get; set; } Guid ParentEntityID{ get; set; } Guid RoleId { get; set; } void SetFromEntity(); void Save(); ...
Due to the use of Generics in Java I ended up in having to implement a function having Void as return type: public Void doSomething() { //... } and the compiler demands that I return something. For now I'm just returning null, but I'm wondering if that is good coding practice... I've also tried Void.class, void, Void.TYPE, new Vo...
Hi, I have the following code: class SuperClass { public static String getName() { return "super"; } } class SubClass extends SuperClass { public static String getName() { return "sub"; } } public class Dummy<T extends SuperClass> { public void print() { System.out.println("SuperClass: " + SuperClass.getName()); ...
Hello I am trying to limit the size of my generic list so that after it contains a certain amount of values it wont add any more. I am trying to do this using the Capacity property of the List object but this does not seem to work. Dim slotDates As New List(Of Date) slotDates.Capacity = 7 How would people advice limi...