delegates Questions
3
Solved
I need a method that takes a MethodInfo instance representing a non-generic static method with arbitrary signature and returns a delegate bound to that method that could later be invoked using Dele...
Vicious asked 3/5, 2013 at 17:4
5
Solved
I have a bunch of functions in Python out1, out2, out3 etc. and would like to call them based on an integer I pass in.
def arryofPointersToFns (value):
#call outn where n = value
Is there an e...
3
Solved
Rather perplexed by this omission--but in Qt's QAbstractItemView class, it's possible to set a QAbstractItemDelegate (i.e., QItemDelegate or QStyledItemDelegate) to the entire view, a single row, o...
Evolve asked 15/3, 2013 at 20:59
3
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I have a drop down list that is populated by inspecting a class's methods and including those that match a specific signature. The problem is in taking the selected item from the list and getting t...
Calabar asked 2/6, 2009 at 16:58
2
Solved
I want to use Kotlin delegation in a particular context.
The delegate should not be passed in the constructor.
I want to keep a reference to the delegate for later use in the code. From within the...
Meijer asked 21/4, 2022 at 13:18
4
Solved
This is related to the question about return type attributes and anonymous classes, but then for anonymous methods (or lambdas), but as far I could find this exact question does not seem to be on s...
Cromorne asked 15/9, 2009 at 12:19
3
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I'm building a hierarchical collection class that orders magnetic resonance images spatially and arranges them into groupings based on the various acquisition parameters that were used to generate ...
12
Solved
I understand lambdas and the Func and Action delegates. But expressions
stump me.
In what circumstances would you use an Expression<Func<T>> rather than a plain old Func<T>?
Pitch asked 27/4, 2009 at 13:50
14
Solved
Is it possible to unsubscribe an anonymous method from an event?
If I subscribe to an event like this:
void MyMethod()
{
Console.WriteLine("I did it!");
}
MyEvent += MyMethod;
I can un-subscr...
Magnanimity asked 8/10, 2008 at 15:24
4
Solved
Is it possible implement the GOF command pattern using a Queue of Action delegates?
I have been trying to wrap my head around it for a while and I am stumped because each of the possible actions I...
Decameter asked 11/10, 2010 at 5:44
5
Solved
If I have the below code, should I just call the Action or should it call Action.Invoke?
public class ClassA
{
public event Action<string> OnAdd;
private void SomethingHappened()
{
if (...
4
Solved
I want to do a lazy initialization for a var property. Since by lazy is restricted only to val properties I have to write something like this:
private var currentContextProvider: ContextProvider?...
9
Solved
Take the method System.Windows.Forms.Control.Invoke(Delegate method)
Why does this give a compile time error:
string str = "woop";
Invoke(() => this.Text = str);
// Error: Cannot convert lambd...
13
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I have several methods all with the same parameter types and return values but different names and blocks. I want to pass the name of the method to run to another method that will invoke the passed...
15
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How does one go about making a delegate, i.e. NSUserNotificationCenterDelegate in swift?
Abruzzi asked 7/6, 2014 at 16:23
9
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Say I have a class with many of public methods:
public class MyClass {
public void method1() {}
public void method2() {}
(...)
public void methodN() {}
}
Now I would like to create a wrapp...
Carpometacarpus asked 20/5, 2015 at 8:50
10
Solved
Can someone provide a good explanation (hopefully with examples) of these 3 most important delegates:
Predicate
Action
Func
6
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I would like to pose this question as long as I am trying currently to dig into the use and the purpose of delegates, although it is likely to have been asked in similar formulations.
I know that ...
5
I was investigating the performance hit of creating Cachedependency objects, so I wrote a very simple test program as follows:
using System;
using System.Collections.Generic;
using System.Diagnosti...
Cimon asked 15/3, 2010 at 14:57
2
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I'm working on a Windows Forms application, and it contains custom controls with methods that can potentially be called from threads other than the UI thread. So these methods therefore look a bit ...
Razorback asked 17/7, 2015 at 10:34
4
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I've recently moved back to C# from being in Objective-C land, and the async/await keywords in C# 5 look cool. But I'm still trying to get a handle on the proper syntax.
I want to declare a method...
Rutaceous asked 14/12, 2011 at 20:51
1
Solved
I am converting an iOS app from UIKit to SwiftUI. I have a UIViewController that displays a view with different buttons. This UIViewController has a delegate that conforms to a specific proto...
2
Solved
didOutputSampleBuffer function in my code was not called. I don't know why it happened. Here's the code:
import UIKit
import AVFoundation
import Accelerate
class ViewController: UIViewController ...
Miculek asked 3/1, 2016 at 2:57
6
C# delegates have always been difficult for me to grasp and so I was very happy to stumble across logicchild's article on The Code Project web site titled "C# Delegates: Step by Step". He has a ver...
Denysedenzil asked 20/9, 2010 at 11:9
6
Solved
Suppose I have two applications written in C#. The first is a third party application that raises an event called "OnEmailSent".
The second is a custom app that I've written that I would like to s...
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