extension-methods

The C# team has previously considered adding extension properties, events, etc. to C#. Per Eric Lippert: http://blogs.msdn.com/b/ericlippert/archive/2009/10/05/why-no-extension-properties.aspx For these features to be useful however, they would have to be able to store some new kind of state with an object. It seems like the only way to do this would be to use a dictionary and associate each instance of an object with whatever the additional state is. It would be useful if it were possible to copy this functionality "manually" by creating my own dictionary (and perhaps get/set extension

This question already has an answer here: Is there a generic constructor with parameter constraint in C#? 7 answers 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 business object has a constructor taking data object as parameter. Following is code of my function: public static IList<T> ConvertTo<A,T>(this

I'm trying to implement a c++ like template with C# generics and policy pattern based on this answer This is a sample of the pattern: interface ISomePolicy<T,U> { void _doSomething(U u); } class MyClass<T,U>: ISomePolicy<int, double>, ISomePolicy<int, int> { internal T myElement {get;set;} public MyClass(T Element) { myElement = Element; } void ISomePolicy<int, double>._doSomething(double u) { Console.WriteLine("this is int, double"); } void ISomePolicy<int, int>._doSomething(int u) { Console.WriteLine("this is int, int"); } } static class MyClassExtension { //What I want to do public static

I don't think it's possible to use operators as a parameters to methods in C# 3.0 but is there a way to emulate that or some syntactic sugar that makes it seem like that's what's going on? I ask because I recently implemented the thrush combinator in C# but while translating Raganwald's Ruby example (1..100).select(&:odd?).inject(&:+).into { |x| x * x } Which reads "Take the numbers from 1 to 100, keep the odd ones, take the sum of those, and then answer the square of that number." I fell short on the Symbol#to_proc stuff. That's the &: in the select(&:odd?) and the inject(&:+) above. Well, in

I have a query pulling from a database: List<myClass> items = new List<myClass>(from i in context select new myClass { A = i.A, B = "", // i doesn't know this, this comes from elsewhere C = i.C } I also have another query doing a similar thing: List<myClass2> otherItems = new List<myClass2>(from j in context select new myClass2 { A = j.A, // A is the intersection, there will only be 1 A here but many A's in items B = j.B } In reality these classes are much larger and query data that is separated not only by database but by server as well. Is it possible to use a LINQ query to populate the