Speaking about whether it’s really necessary to call Dispose on CancellationTokenSource… I had a memory leak in my project and it turned out that CancellationTokenSource was the problem. My project has a service, that is constantly reading database and fires off different tasks, and I was passing linked cancellation tokens to my workers, so even … Read more
Yes you can run HttpListener in non-admin mode. All you need to do is grant permissions to the particular URL. e.g. netsh http add urlacl url=http://+:80/MyUri user=DOMAIN\user Documentation is here.
.NET 4.0 allows primary interop assemblies (or rather, the bits of it that you need) to be embedded into your assembly so that you don’t need to deploy them alongside your application. For whatever reason, this assembly can’t be embedded – but it sounds like that’s not a problem for you. Just open the Properties … Read more
By no means am I an expert in this, but I stumbled recently on what I think you want: the CoClass attribute class. [System.Runtime.InteropServices.CoClass(typeof(Test))] public interface Dummy { } A coclass supplies concrete implementation(s) of one or more interfaces. In COM, such concrete implementations can be written in any programming language that supports COM component … Read more
The first is a much better option. Parallel.ForEach, internally, uses a Partitioner<T> to distribute your collection into work items. It will not do one task per item, but rather batch this to lower the overhead involved. The second option will schedule a single Task per item in your collection. While the results will be (nearly) … Read more
Suppose you had a class C<T> that was covariant in T. What might its implementation look like? T has to be out only. That means that C<T> cannot have any method that takes a T, any property of type T with a setter, or any field of type T, because fields are logically the same … Read more
The dynamic keyword was added, together with many other new features of C# 4.0, to make it simpler to talk to code that lives in or comes from other runtimes, that has different APIs. Take an example. If you have a COM object, like the Word.Application object, and want to open a document, the method … Read more
A bunch of people have pointed out that C# does not make inferences based on constraints. That is correct, and relevant to the question. Inferences are made by examining arguments and their corresponding formal parameter types and that is the only source of inference information. A bunch of people have then linked to this article: … Read more
Variance will only be supported in a safe way – in fact, using the abilities that the CLR already has. So the examples I give in the book of trying to use a List<Banana> as a List<Fruit> (or whatever it was) still won’t work – but a few other scenarios will. Firstly, it will only … Read more
Here’s what I put together to help me understand the difference public interface ICovariant<out T> { } public interface IContravariant<in T> { } public class Covariant<T> : ICovariant<T> { } public class Contravariant<T> : IContravariant<T> { } public class Fruit { } public class Apple : Fruit { } public class TheInsAndOuts { public void … Read more