1
vote
1answer
119 views

Should the Presenter depend on the View or the vice versa?

So far, I have used the MVP architecture pattern a few times. Every now and then, I wonder whether my Presenter should depend on my View or vice versa, that is the View depends on my Presenter. NOTE ...
0
votes
5answers
341 views

Liskov Substitution and SRP Principle violation - how best to structure this scenario?

While learning SRP and LSP, I'm trying to improve the design of my code to comply best with both of these principles. I have an employee class that has a calculatePay method on it. Firstly, I believe ...
0
votes
2answers
72 views

Possible design patterns for base function with possible additions

I have various interfaces i have to implement. Let's assume ITypeA, ITypeB. They have following methods: ITypeA Connect Disconnect GetData SetData ClearData ITypeB Connect Disconnect ...
3
votes
1answer
175 views

Redundancy caused by polymorphism

I have two chat rooms, one has administration behaviour, and one doesn't. I have factored out all of the common code into a base chat room, but the AdministerChatroom behaviour I have pulled out into ...
0
votes
2answers
149 views

Proper Query Object Pattern - NHibernate

I was looking to an alternative to Repository Pattern and I've read about "Query object pattern" (http://lostechies.com/jimmybogard/2012/10/08/favor-query-objects-over-repositories/). However the ...
1
vote
3answers
149 views

Extending a struct. Using helper classes rather than composition

I have a struct which I want to add static methods to. Yes, you guessed right I'm talking about Datetime. It's a pretty typical requirement to add MyCustomParse. It happens to return Datetime?, so ...
0
votes
2answers
233 views

Effective Repository in C# - Where to put methods?

I'm trying to build a new application using the Repository pattern for the first time and I'm a little confused about using a Repository. Suppose I have the following classes: public class Ticket { ...
0
votes
0answers
57 views

Encapsulate multiple properties into a single class to use as a custom DependencyProperty

My application is a WPF project implemented in C# .NET (4.5) using an MVVM architecture with no code-behind in the View. In order to eliminate the coupling between the View and the ViewModel I'm ...
0
votes
1answer
165 views

Onion Architecture Structure

I am looking to understand and implement the Onion Architecture and have a vague idea on how to structure everything but need help to clear up some of my confusion. Based on different examples and ...
2
votes
2answers
188 views

Best patterns for variable-scope disposables

I have Client which uses a disposable Connection for talking to a remote service. A Connection is somewhat expensive to set up and needs to be Dispose()d properly. I want to allow multiple methods ...
0
votes
1answer
106 views

What design pattern should I use for import, update, export

I need to create a simple payments validator. On the following class diagram, I tried to present the model of payments. As you can see, each payment type inherits from Payments class. Now I want ...
1
vote
2answers
150 views

Sanity check for design pattern used with an intricate calculation model

I am working on a project that generates technical brochures in batch. The 3rd party API that is being used expects POCOs with property names that match field names used in each of the brochure ...
4
votes
5answers
2k views

Is this a good practice or not?

I have a colleague who has come up with a way of 'genericizing' information from a database so that all his web application's drop-down lists can share the same object in his MVC.NET C# code and ...
0
votes
1answer
212 views

Confused on how to properly employ a Repository Pattern with Service/Business Layer on top

I'm building a ASP.NET Web Api 2 solution for learning purposes, and I've hit a snag. I was wondering if anyone could tell me what exactly it is that I'm missing. My Web Api solution has 4 Layers: ...
1
vote
1answer
104 views

Implement Generic DataSet Builder with C#

I want to create a data access library that can build a DataSets with relations which can easily be written to XML with dataset.WriteXML(). This is a get to know C# endeavor that will hopefully gain ...
3
votes
1answer
93 views

Pattern to use to relate multiple data sources to different user data widgets

I have an client x server intranet application the basically gets data from the server, format it and send that data to the client for display. At the server we are using ASP.NET C# running on IIS ...
0
votes
0answers
67 views

does class reference itself static anti pattern in prism

I have an application and my desing approach look like this: class Manager { public int State; static Manager _instance = null; public static Manager Instance { get { return ...
0
votes
0answers
225 views

What's the best way to expose a Model object in a ViewModel?

In a WPF MVVM application, I exposed my model object into my viewModel by creating an instance of Model class (which cause dependency) into ViewModel. Instead of creating separate VM properties, I ...
0
votes
2answers
356 views

How to design console application with good seperation of UI from Logic

Is it considered an overkill for console application to be design like MVC , MVP or N tier architecture? If not which is more common and if you can link me to simple example of it. I want to ...
2
votes
1answer
198 views

Best practice to collect information from child objects

I'm regularly facing following pattern: public abstract class BaseItem { BaseItem[] children; // ... public void DoSomethingWithStuff() { StuffCollection collection = new ...
1
vote
2answers
445 views

Correct way to inject dependencies in Business logic service?

Currently the structure of my application is as below Web App --> WCF Service (just a facade) --> Business Logic Services --> Repository -> Entity Framework Datacontext Now each of my Business logic ...
2
votes
1answer
75 views

Use adapter pattern for coupled classes

I need (for unit testing purposes) to create adapters for external library classes.ExchangeService and ContactsFolder are Microsoft's implementations in its' EWS library. So I created my adapters that ...
0
votes
2answers
207 views

Optimization ended up in casting an object at each method call

I've been doing some optimization for the following piece of code : public void DrawLine(int x1, int y1, int x2, int y2, int color) { _bitmap.DrawLineBresenham(x1, y1, x2, y2, color); } After ...
1
vote
4answers
243 views

Relative encapsulation design

Let's say I am doing a 2D application with the following design: There is the Level object that manages the world, and there are world objects which are entities inside the Level object. A world ...
1
vote
1answer
173 views

Should I use inheritance or an interface?

So in a nutshell I have an abstract class : public abstract class Member { public string PCode { get; set; } public string Reference { get; set; } public DateTime? ElectedDate { get; set; } } And ...
0
votes
3answers
395 views

What is the main goal of MVVM pattern? [closed]

Could you tell me what is the goal of the MVVM pattern? What are the arguments or the reasons I can give to a team and product owner to respect and develop according to this pattern? I would like a ...
0
votes
2answers
87 views

Container/Item pattern without `friend`

I have a class Container containing objects of type Item. They are different classes, and especially they have no common base class (e.g. a Container does not itself have a Container).: class ...
0
votes
0answers
142 views

How to design modular “screen configurator” for database application

I am currently working with a product that is effectively a glorified CRUD application. (It is a C# .NET 4.0 desktop application backed by an Oracle 11gR2 database.) The client program presents a list ...
2
votes
6answers
341 views

Design pattern for method to accept one of several static items in C#?

I want to illustrated my question by way of a (hopefully) representative example. Lets say I have a situation where I am developing a class library in C# to be used in some simulations. I want to ...
1
vote
0answers
102 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 ...
4
votes
2answers
395 views

Should I expose a “computed” value as a property or a method?

I have a C# class that represents a content type in a web content management system. We have a field that allows a web content editor to enter an HTML template for how the object is displayed. It ...
2
votes
1answer
136 views

Does a repository belong in this project?

I have a project that gets all of its data from API calls. The server that hosts this API connects with it's own database (not even sure what DB it is, etc). More or less the idea of a repository is ...
3
votes
2answers
168 views

Is it an acceptable practice to Get a property, that involve parsing binary, that might throw an exception?

I have a property that is loaded lazily, any time after the ctor is called. It is possible that the binary that my property relies on is invalid. If invalid I might have to throw an exception. ...
0
votes
3answers
188 views

Is the Adapter the correct design pattern for this situation?

I have an instance of a class UntouchableClass of which I need to access the member variables to use in my DotLiquid template. Problem is, UntouchableClass has to inherit from Drop if I want to use it ...
2
votes
2answers
253 views

Pattern for multiple datasources

I've already read this question on CodeReview. I was hoping for general advice. I'm writing a service which will go to numerous data sources. Each source requires getting copious amounts of data ...
0
votes
1answer
341 views

Migrating old Asp.net 1.1 project to mvc 3 or 4

we have to migrate a very old project that are having more than 500 web forms and 400 tables and it is hugely depends on stored procedures, the current specification is: Asp.Net : .NET version 1.1 ...
0
votes
4answers
540 views

What is this design pattern called? [closed]

I have some code: /// <summary> /// Represents Record Locator class /// </summary> public class RecordLocator : IRecordLocator { /// <summary> /// The Record Locator string, ...
5
votes
3answers
641 views

Extension method naming convention [closed]

We are using some utility methods in our company to simplify programming. So we have following string extension: public static bool IsNoE(this string s) { return string.IsNullOrEmpty(s); } ...
3
votes
2answers
586 views

Choosing the right Design Pattern

I've always recognized the importance of utilizing design patterns. I'm curious as to how other developers go about choosing the most appropriate one. Do you use a series of characteristics (like a ...
1
vote
1answer
283 views

ASP.NET MVC SoC when dealing with back end objects (design decision)

I had a discussion with some peers and even some technical leads in the team around this and Im all for the purist MVC approach. Especially when the project is in its infant stages (its easy to ...
0
votes
1answer
90 views

What is the shortcoming of custom factory comparing to generic factory [closed]

I have a factory method as given below public class AutomobileFactory { Dictionary<string, ICar> internalFactory = new Dictionary<string, ICar>(); public AutomobileFactory() { ...
2
votes
1answer
233 views

DI or Factory Pattern ? Both ? or a different apprach?

Lets say we have an abstract class called BaseSwitch, inherited by concrete implementations Switch A and Switch B, Each Switch representing a real-life switch (A telephony tool which among its ...
1
vote
3answers
295 views

Pattern for costly precondition check before acting

Let's say I have a method DoTheThing() which requires the precondition-check CanTheThingBeDone() to return true. The latter method is time consuming as it accesses the database. I'm finding it hard ...
4
votes
1answer
347 views

State pattern vs Inheritance

In the following image for the State Pattern from Applying Domain-Driven Design and Patterns: With Examples in C# and .NET I'm trying to persist the SalesOrder entity into the database. Normally I ...
0
votes
1answer
205 views

Need an OOP pattern or strategy for “pluggable” property

I'm using OOP and MVVM in a WPF c# application. The goal is for the resulting object (data-bound to user interface) to accurately represent a product. One specific area of the product is highly ...
1
vote
2answers
1k views

Why separate class CommandHandler with Handle() instead of handling method in Command itself

I have a part of CQRS pattern implemented using S#arp Architecture like this: public class MyCommand { public CustomerId { get; set; } // some other fields } public class ...
3
votes
2answers
239 views

Help with inheritance hierarchy design

I'm having trouble designing an inheritance hierarchy. In the figure: Base class: This uses the Template Method. Contains core logic/algorithm that calls virtual/abstract methods Derived ...
3
votes
1answer
88 views

Development console commands registration

I have a DevelopmentConsole class. I am making functionality to register console commands for the subsystems. I don't want the console to know about them but also I don't want them to contain a debug ...
4
votes
5answers
238 views

Loose coupling and shuffling dependencies

I have a bunch of classes that look something like this: public class MyGame() { private Graphics graphics; private Player player; public MyGame() { graphics = new ...
0
votes
1answer
515 views

State design pattern: best implementation for my case?

Me and a mate have a discussion about what would be the best way to implement the pattern state for managing several screens for an application we are developing. We have a ScreenManager (I guess the ...