I'm creating a number of UserControls dynamically using LoadControl(String) and want to subscribe to an event of each of them. All my controls inherits a common Interface that require an implementation of a common Event: public interface IObjectProcessor { event EventHandler<ObjectProcessedEventArgs> ObjectProcessed; } So I do next ...
Let's say I have the following code: public class Foo { private int x; private int y; public Bar CreateBar() { return new Bar(x, () => y); } } [Serializable] public class Bar { private int a; private Func<int> b; public Bar(int a, Func<int> b) { this.a = a; this.b = b; }...
After reading Dynamically calling unmanaged dlls in .net I've been trying to modify the code to my liking. I made a class that implements idisposable to wrap load calls in and free them when needed. However I can't seem to figure out the syntax if it is possible to use anonymous delegates with it. var loaded=DynamicLibraryLoader.TryLo...
Say if I listen for an event: Subject.NewEvent += delegate(object sender, NewEventArgs e) { //some code }); Now how do I un-register this event? Or just allow the memory to leak? ...
Hi Guys, I have the following code: public List<IWFResourceInstance> FindStepsByType(IWFResource res) { List<IWFResourceInstance> retval = new List<IWFResourceInstance>(); this.FoundStep += delegate(object sender, WalkerStepEventArgs e) { if (e.Step.ResourceType =...
I am trying to get my head around the use of the Action delegate type for use in forcing a timeout when methods called in a 3rd party COM dll hang up. After much searching I find that I can use Action<> or Func<> and pass up to 4 generic parameters depending on whether the method called returns a parameter or not. For this instance I wi...
Consider the following example code: static void Main(string[] args) { bool same = CreateDelegate(1) == CreateDelegate(1); } private static Action CreateDelegate(int x) { return delegate { int z = x; }; } You would imagine that the two delegate instances would compare to be equal, just as they would when using the good old name...
Is the recent movement towards anonymous methods/functions by mainstream languages like perl and C# something important, or a weird feature that violates OO principles? Are recent libraries like the most recent version of Intel's Thread Building Blocks and Microsofts PPL and Linq that depend on such things a good thing, or not? Are lan...
Wondering if this is possible in PHP Land: Let's say I have a class as follows: class myClass{ var $myVar; ... myMethod(){ $this->myVar = 10; } } and another class: class anotherClass { ... addFive(){ $this->myVar += 5; } } The 'anotherClass' is 3500 lines long and I just want the single 'addFive' m...
Hi! I'm using Delphi 2009 and get some strange errors using the following code segment: var Str : AnsiString; CharPtr : PAnsiChar; ... CharPtr := PAnsiChar (Str); ExecuteInBackgroundThread ( procedure begin DoSomething (CharPtr); end); I'm guessing that the string is destructed when falling out of scope and under some ...
All the examples I can find about Func<> and Action<> are simple as in the one below where you see how they technically work but I would like to see them used in examples where they solve problems that previously could not be solved or could be solved only in a more complex way, i.e. I know how they work and I can see they are terse and ...
is it possible to create an anonymous method in c# from a string? e.g. if I have a string "x + y * z" is it possible to turn this into some sort of method/lambda object that I can call with arbitrary x,y,z parameters? ...
Based on my understanding , i interpret the meaning of Func delegate as follows.Please correct them as and when it is needed. Declaration : Func<int> dg ; 1. Could i interpret it as "a Delegate pointing to a method that returns an integer?". Declaration : Func<int,int> delg1=r=>2*r; *2. Could i interpret it as " 'r' is a la...
This question may be very similar to my one, but I cannot see the answer I need in it. I have a class, called CASM, that has a List<Action>. I want to serialize this class (using the BinaryFormatter or something similar). This class and all classes referenced in the Actions have got correct [Serializable] and [NonSerializable] attributes...
This is not a dupe of Calling a method with ref or out parameters from an anonymous method I am wondering why out parameters are not allowed within anonymous methods. Not allowing ref parameters makes a bit more sense to me, but the out parameters, not as much. what are your thoughts on this ...
While looking up the answer to this question: "Why is an out parameter not allowed within an anonymous method?" I've got a little lost about how do lambda expression and anonymous methods actually work. In the comments JaredPar states that "Imagine for instance that the out parameter referred to a local variable on the stack. The lambda...
I have a method Foo4 that accepts a parameter of the type Func<>. If I pass a parameter of anonymous type , I get no error. But if I create and pass an object of the type 'delegate' that references to a Method with correct signature, I get compiler error. I am not able to understand why I am getting error in this case. class Learn6 ...
I just lifted this snippet from a website and it proved to be exactly the solution I needed for my particular problem. I have no idea what it is (particularly the delegate and return parts) and the source doesn't explain it. Hoping SO can enlighten me. myList.Sort( delegate(KeyValuePair<String, Int32> x, KeyValuePair<String, Int32>...
I'd like to be able to define an inline anonymous selector that a selector wherever a selector is needed as an argument. Is this possible, or do I have to just suck it up and define a method? Background: In my iPhone application I need to update my UI from another thread. To do this I use performSelectorOnMainThread:withObject:waitUnti...
Hi I have some linq to sql method and when it does the query it returns some anonymous type. I want to return that anonymous type back to my service layer to do some logic and stuff on it. I don't know how to return it though. I thought I could do this public List<T> thisIsAtest() { return query; } but I get this error Error...