delegates

问题 I want to know what is fastest way to get value (only for this problem) from an object`s property ? after some searching I saw a post from @MarkGravell in this site He wrote this code : using System; using System.Reflection; using System.Reflection.Emit; public class Foo { public Foo(int bar) { Bar = bar; } private int Bar { get; set; } } static class Program { static void Main() { var method = new DynamicMethod("cheat", typeof(int), new[] { typeof(object) }, typeof(Foo), true); var il =

问题 Here is the method inside a class: import UIKIt import Foundation class notMoving { var drumPlayerObject = drumPlayer() var fileManagerObject = fileManager1() let drumStrength = 1 var bassStrength = 1 var synthStrength = 1 var indexToPlay: Int = 0 // here we start the drum player. func startToPlay() { fileManagerObject.clearPlayedListDrum(drumStrength, KeyNoteOfInstDrum: "C") if let indexToPlay = fileManager1().randomizeTheNextInstrument(fileManager1().drums, Strength: drumStrength, KeyNote:

问题 In .NET, Is there a way to check whether an object is of a delegate type? I need this because I'm logging the parameters of method calls, and I want to print "(delegate)" for all parameters which are actions or functions. 回答1: This works perfectly for me class Test { public delegate void MyHandler(string x); public void RunTest() { var del = new MyHandler(Method); if (del is Delegate) { Console.WriteLine(@"del is a delegate."); } else { Console.WriteLine("del is not a delegate"); } } private

问题 I'm trying to combine delegates/observable with vetoable (which isn't a problem after looking at the source kotlin.properties.Delegates.kt), but things got hairy when trying to also store the properties in a map. Or in other words, how to combine these three: var k1: Int by Delegates.observable(0) { property, oldValue, newValue -> println("Hi from k1 observer") } var k2:Int by Delegates.vetoable(0) {property, oldValue, newValue -> println("Hi from k2 more-than check") oldValue > newValue }

问题 I'm trying to combine delegates/observable with vetoable (which isn't a problem after looking at the source kotlin.properties.Delegates.kt), but things got hairy when trying to also store the properties in a map. Or in other words, how to combine these three: var k1: Int by Delegates.observable(0) { property, oldValue, newValue -> println("Hi from k1 observer") } var k2:Int by Delegates.vetoable(0) {property, oldValue, newValue -> println("Hi from k2 more-than check") oldValue > newValue }

问题 Hi I am trying to implement a method that will take a method (any method in the grand scheme of things) as a parameter. I want this parameter method to run when in the method that called it only, If the method that passes into this method has a return value then it should still be able to return its value. I want to measure the performance of the methods that are passed in. return Performance(GetNextPage(eEvent, false)); public static T Performance<T>(T method) { T toReturn; Stopwatch sw =

问题 I am totally new to iOS and I am working on an application that has many frame animations. Everything is going well until I try to do my final animation in a method that I am posting below. The method is a delegate assigned to the Built in Text to Speech synthesizer func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) { if spoken == 0{ spoken += 1 print("speaking finished") self.ImageView.stopAnimating() self.ImageView.image = self.circleImages

问题 I want to pass as callback a C++ member function to a C# project. I have other project in C++/CLI and I want to do it through it. So, in unmanaged C++ of my C++/CLI project I have a function object: std::function<void(int)>callback; This function is coming from my C++ project and it works fine, I save it there as example to avoid the previous step. Now, I would like to pass this callback function to my C# project. For this, I create a method in unmanaged C++, pass it to managed C++ and from

问题 I have the following issue: I have designed a framework that uses a generic delegate function (Func<...>) to calculate distance between two real number vectors The delegate has the following form: Func<double[], double[], double> distance; I have many different distance functions implemented I would rather not change the signature of distance delegate I need to create a new function that besides two double vectors needs some additional parameters i.e. Func<double[], double[], double, double,

问题 I have a .NT class which has multiple delegates for callbacks from native code. Is it necessary to allocate all the delegates? I mean does GCHandle.Alloc() protects just the delegate or the entire class that owns the delegate from being collected? 回答1: A delegate has two relevant properties, Method and Target. The Target will be non-null if the delegate was created for an instance method. And that keeps the object alive, as long as the garbage collector can see the delegate instance. Native