The tag has no usage guidance.

learn more… | top users | synonyms

2
votes
3answers
115 views

Why aren't properties implicitly convertible to delegates

We all know that properties in C# get compiled to actual plain old methods. But unlike method(-group)s, they can't be given as arguments to other methods excepting a delegate like a Func<T> or ...
0
votes
1answer
68 views

Is it a good practice to use a Service without Delegate?

I have a simple REST application with a single controller. The application needs to fetch data from a Database, convert it to JSON and return this to the caller. I need to decide what layers I should ...
0
votes
0answers
86 views

What to use in case of waiting for something that is complete: delegates, events and/or thread

I try to give a concrete example. Create a semaphore for a crossroads. I have two semaphores. I have possibility to set a duration of semaphore 2 minutes, 5 minutes, 10m inutes etc. When one ...
4
votes
1answer
117 views

Using delegates as named lambdas

Suppose we have a domain in which we can generalise some operation by passing in a function, like the Select \ map functions. Now suppose that the function we pass in has some domain specific name, ...
3
votes
3answers
404 views

Differences between “first-class function” mechanisms

Some languages (Javascript, Python) have the notion that a function is an object: //Javascript var fn = console.log; This means that functions can be treated like any other object (first-class ...
2
votes
1answer
302 views

Strategy Pattern not sufficient for my problem?

Let me sketch the situation: I have multiple users, with certain properties (2 enums) For each user I need to fetch data, for some with some basic filtering, for some extended filtering (= basic ...
-1
votes
1answer
263 views

What is the difference between Adapter and Delegation design pattern?

I am very confused about Adapter and Delegation design pattern. In Adapter pattern we bring an intermediate class to interact with another class. And in Delegation pattern we also bring an ...
2
votes
1answer
108 views

how to split up a delegate class

I have a communication class that incapsulates all the apis of a remote application. This class happens to be a delegate class because it is interchangeable with another one (the remote application ...
1
vote
3answers
226 views

Using delegates to avoid duplicate creation of resources

I'm writing a PCL that uses an HttpClient to go visit a few sites and extract data from them. My initial code looked like this: public static class Download { public async static Task<byte[]&...
2
votes
3answers
198 views

Many different classes that need similar functionality. Best approach?

I have many (at the moment around 30) different message classes in an application I am creating. Each of these messages need to be serialized and deserialized. However, the process of serializing and ...
3
votes
2answers
186 views

Why aren't field-like events implemented as a list of delegates?

tl;dr: Why are field-like events implemented as a single delegate field? Wouldn't it be more straight-forward to use a list of delegates, thereby eliminating the null special case and avoiding all the ...
2
votes
1answer
326 views

Avoiding closures

I have a data structure in the form of a tree. Each node represents a cardboard box. The boxes can contain child boxes. public class CardboardBox { public int Id {get; set;} public int ...
0
votes
1answer
92 views

Is it ok for a for a View to dismiss itself?

Currently, I'm working on a project in which a view is dismissing itself. While talking to another programmer on the team for this project, he said that it's fine (in that it behaves correctly), but ...
1
vote
1answer
298 views

Generic delegates (C#) in Scala?

I wanted to know if there is an equivalent of the C# generic delegates in Scala. The reference website is: http://msdn.microsoft.com/en-us/library/dd233060.aspx I'm trying to make a complete ...
2
votes
2answers
724 views

Understanding C# Delegates Structure

I've been trying to understand C# delegates using Pro C# 5. In short, the author describes the motivation for delegates as a structured way of dealing with function pointers and callbacks or two-way ...
0
votes
0answers
37 views

Own Exception or Delegation design pattern to exit a program?

I am writing an application in Java which use MVC pattern design. I have 4 major classes: Main, Controller, Model, View. Main initialize the other three and run launchMenu() in a infinite loop, a ...
0
votes
0answers
297 views

Delegate method privately called from delegate itself?

One has established design patterns so ingrained in their brain, that when sometimes somebody does something unexpected, it is a revelation. My colleague in an iOS project did call the delegate ...
0
votes
1answer
63 views

Is it fine for a class that creates objects to delegate them?

I have a large list of intercommunicating components; so I decided to have one class create all of them and then subsequently delegate them to other classes to facilitate finer tweaking and wiring ...
2
votes
0answers
134 views

Run a function when a function in a list is executed?

Goal: I'm currently doing an MVC project and I have this method to update the ViewBag (based on previous actions of the user). I would like to call this function whenever a certain list of MVC Actions ...
5
votes
4answers
2k views

C# Delegates are immutable - but why does that matter?

This is a followup question to this other question. Background Working from the MSDN Delegates Tutorial (C#), I see the following: Note that once a delegate is created, the method it is ...
24
votes
7answers
10k views

Why would I ever use delegates if I'm not doing events? [duplicate]

I am trying to learn how to do events in C#, and according to the MSDN Events tutorial, Events are declared using delegates. If you have not yet studied the Delegates Tutorial, you should do so ...
5
votes
6answers
1k views

Do delegates defy OOP

I'm trying to understand OOP so I can write better OOP code and one thing which keeps coming up is this concept of a delegate (using .NET). I could have an object, which is totally self contained (...
3
votes
3answers
2k views

Why use protocol, not call the method directly?

I was asked this question in an interview. For eg: UITableviewDelegate protocol has CellForRowAtIndexpath. Why make it a delegate method in a protocol not a method in the UITableView class and call it ...
8
votes
2answers
17k views

What is Delegation and why is it important in iOS programming?

At the moment I am teaching myself iOS programming, and one concept I find really hard to wrap my head around is delegation. What is it? Why and how is it used? What is the advantage? The technical ...
3
votes
2answers
485 views

Template method within one class without subclasses or inheritance

I have an algorithm with mostly invariant parts that needs to be reused within one class so as to stay DRY. Code duplication with repeating method structure public void save(String key, int value) {...
7
votes
5answers
12k views

What are the advantages of the delegate pattern over the observer pattern?

In the delegate pattern, only one object can directly listen to another object's events. In the observer pattern, any number of objects can listen to a particular object's events. When designing a ...
6
votes
2answers
3k views

MVC and delegation

I am a beginning iOS programmer and use the Model-View-Controller model as a design pattern: my model doesn't know anything about my view (in order to make it compatible with any view), my view doesn'...
3
votes
2answers
2k views

Strategy vs Delegates

Can the Strategy design pattern entirely replace delegates? In Java, for example, there are no delegates. Is it possible to gain all the features of delegates by using Strategy design pattern? Edit:...
4
votes
1answer
958 views

Need to process 2 million 100k messages per second and route them to a particular event, delegate or multicast delegate

I need to process 2 million messages per second (perhaps in a scale out configuration) and route each message to a N delegates or multicast delegates. Question How should I structure my application ...
6
votes
2answers
489 views

Delegates and events

What is the difference between public delegate void SecondChangedHandler(Object clock, TimeInfoEventArgs ti); public event SecondChangedHandler OnSecondChanged; and public event EventHandler<...
4
votes
2answers
2k views

How do delegates fit into ASP.NET?

A developer told me they used delegates to bind most of their events in ASP.NET. Until then, I did not even know it was possible to use delegates in ASP.NET in a meaningful way. My understanding ...
7
votes
4answers
514 views

Can you overuse delegates and events

I've just started getting to grips with event driven programming and I'm finding delegates and events to be very useful. Since starting to see the potential I've began using them all the time to solve ...
2
votes
5answers
355 views

Delegate vs Method

Is there any advantige using delegates instead of methods? For example: public void LoginAuthenticate(object sender, AuthenticateEventArgs e) { if (Membership.ValidateUser(lgUserLogin.UserName, ...
3
votes
2answers
627 views

Delegate pattern for retrieving data v.s. using simple setters

I am considering using the Delegate Pattern to get some data necessary for an operation. There are a few different pieces of data that the algorithm needs to run, but they all have default values that ...
11
votes
10answers
35k views

Real world use of C# Delegates [closed]

I think that I conceptually understand C# delegates, however, I am struggling to find a real world example where they would be useful. Can you provide some answers detailing how C# delegates were ...