Questions tagged [c#]
C# is a multiparadigm, managed, garbage-collected object-oriented programming language created by Microsoft in parallel with the .NET platform
4,775
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Should we abandon the "if not null" pattern?
I've seen that with the Dictionary API now has methods with bool TryGetValue<TKey, TValue>(TKey key, out TValue value) and I like this kind of methods because they're signaling to the other devs ...
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2
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Calculate operation time and setuptime or costprice based on a variable set of parameters - Design Pattern?
I work in a production company where my colleagues calculate costprices based on 3D models and their respective operations. Apart from workactivities where a user has to insert an operation time and ...
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Implementing the Repository/UnitOfWork pattern using Azure.Data.Tables "TableClient"
I currently have a generic Azure repository AzureRepository<TEntity> store internally a list of table transaction actions like so.
private readonly IList<TableTransactionAction> ...
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1
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State machine using SOLID principles. Connecting to real devices
I am trying to implement code for switching states of a couple laboratory devices. My considerations are: how should I link the state objects, state machine object and device manager object to follow ...
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1
answer
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Blazor Application separation of concerns
I am building a cross-platform application and have planned to use Blazor. I have made similar applications in the past but using ASP.Net Core for the back-end and Angular for the front-end. I always ...
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How to implement automatic SemVer from code changes [closed]
Goal
I'm working on libraries published as nuget packages and I would like the version of those packages to update automatically based on the changes I make.
In other words, I would like something ...
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Composition over inheritance in a Equipment sytem for my game? [closed]
Background info:
NetworkComponentAdvanced -> base class for network interactions.
Any class with a Network prefix means it interacts with the network even if on a minimal level.
I am developing a ...
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Doubts designing an old system using DDD
We have the following system:
References that identify a product and have a family which identifies a group in which the reference belongs.
Families that are a way to group references, for example, if ...
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Custom templated controls, user control and MVVM approach
I am developing a data visualisation tool, with some UI interactivity after initial trail with doing it mostly by using templates in XAML and code behind to handle interactive stuff I've realised that ...
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0
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Updating Tab - Proper WPF MVVM [closed]
I've been struggling with the MVVM concept a lot. I am developing a remote file browser, so I can manage files on another computer from my own. I have a button that will open a new tab, so you can ...
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Migration issues with .Net Core Identity and .Net framework Identity [closed]
We have old legacy MVC app that uses Identity 2.0.
Also recently we have created .Net 6 API with Identity 6.0 (AspNetCore.Identity.EntityFrameworkCore).
Note: There are some schema related changes in ...
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Are there any named principles, best practices, etc, that are being violated here? [closed]
I've come across some code like below a couple of points come to mind and unfortunately I'm having trouble finding any actual named principles or anti-patterns or anything that's been violated here, ...
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1
answer
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How Should I Go About Refactoring My Code With Dependency Injection? [closed]
I work on WPF applications used in testing hardware. I need to make my code base more testable and re-usable. I believe DI would help, but I'm not quite sure where to start. I've done my best with the ...
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0
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WPF Best way to create viewmodel from another viewmodel
Often I want to open a new window from within some view.
I see opening a window as view logic. So I don't want code in my viewmodel that creates/opens/changes windows or anything else that interacts ...
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How to refactor legacy c# code without unit tests? [duplicate]
Recentely I'm working on an legacy project that
Has not any unit tests.
Used Entity Framework as data access technology
The DbCobtext used directly in the business codes The
Project is big(writing ...
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6
answers
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Unsupported concurrent calls, throw exception or log a warning?
Context
Let's say I have a navigation service that allows me to navigate to a page.
The Navigate method is async because an animation (about 250ms) is involved.
public interface INavigator
{
...
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vote
1
answer
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Contextual Implementation Overhead vs Redundancy
I have an application that has use cases relative to where it is used. A local client and server, where all the server data is in a single location and the client queries that server knowing it is ...
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1
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How to handle duplicate validation logic with CQRS pattern
I am implementing a CQRS pattern in ASP.NET Core with MediatR, and I am wondering what the general consensus is for handling duplicate validation logic for queries/commands which operate on the same ...
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How to handle continual method addition to an existing class
I find myself often adding more and more methods to a specific class, is this class heading in an unmaintainable direction? Or is this class fine even if it has 50 or more methods?
let's call the ...
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2
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202
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Which strategy to use to create object instances
I have this use case (I've simplified it):
Each student can apply for one or multiple activities. As of now we only have Swimming activity onboarded on the system, but we expect to have more. Base ...
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4
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How to get an ILogger instance from extension methods?
Let's say I have this service abstraction exposed from a library.
public interface INavigator
{
ImmutableList<IPageViewModel> Entries { get; }
void NavigateForward(IPageViewModel page);
...
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1
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Architecture solution for scalable crawling
I have the following requirements:
a list of queries (rather long list ~ 100K - 1M items or even more) that I need to perform in a certain period of time and the execution time must be predictable. ...
0
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2
answers
90
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Where should helper classes/methods for transforming business data for the View be located
I have inherited a badly architected and organised ASP.NET MVC application, which is an online booking system for healthcare providers. It seems to have been designed with very few object oriented ...
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3
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Why would you have a different namespace for each folder in a C# project?
I can't see how having a namespace for each folder makes sense. As near as I can tell, the point of having namespaces is to avoid name conflicts. But, Microsoft, in their namespace naming conventions, ...
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2
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Loop pattern for batch data processing
When processing data sets in batches I usually can think of the following three implementations.
Which one do you consider better than the other and why?
Notes:
The implementation is in C# but the ...
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votes
1
answer
46
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Better design for a REST import into web store
I have an import that needs to grab data from a REST service and import into an web store. It's basically an ETL type of service, but because the REST service can be slow and I don't want to call it ...
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votes
1
answer
54
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Mapping destination object from multiple source objects vs constructing using multiple source objects (as in constructor)
Lets say we have DTO class with 15 properties. Usually DTOs like these are mapped from other objects. But sometimes some DTOs may use values from multiple objects. In these cases, should we “Map” or “...
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4
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How to provide logging to consumers of a NuGet package/library
I've been building a library (NuGet package as I'm in the C# world here) & I want to add logging so the consumer of the library can optionally provide some logger to the library. However, there ...
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3
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Are interfaces made useless by the template pattern?
Refer to the highest upvoted answer here for why you should make an IPizza interface with a IPizza.Prepare() method.
This is highly upvoted, But I think the answer is flawed. Sure a pizza can be ...
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What design pattern does this implementation follow?
For a middleware solution I expose an API, which processes data and sends the necessary information to different parties.
In the current design we create a new client, which acts sort of like an ...
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2
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Case Statements for string to string mapping [duplicate]
I have a class called SomethingProvider that contains:
private static string convertMapA(string convertA)
{
switch (convertA?.ToUpper())
{
case "NONE":
...
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3
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Can be logic around `List<T>.Enumerator._version` considered control flow exploitation?
List<T>.Enumerator “snapshots” list version upon creation by _version = list._version;. This allows enumerator to halt enumeration when List<T> changed during it.
This behavior likely ...
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3
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Should I send the current or previous state with my state changed event?
I have an event that is raised when my job objects change state (e.g. initializing, running, complete, etc). The event is to be invoked from my set method in the State property, but before I make it ...
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Should I perform simple validation (not null, max length, etc.) in a web api controller and duplicate in a command handler?
I have a question about DDD. I wonder if I should add validation in a web api controller and duplicate it in a command handler? Is it good approach to validate a DTO and a command even if the ...
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3
answers
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Use abstract factory (or an alternative way) to produce an instance of a subclass?
Context for this question
I'm currently working with small data storage media (e.g. RFID tags) that contain some fixed number of bytes that can be manipulated. The drivers that allow reading bytes ...
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Builder design pattern when creating object between many layers
I stumbled on following problem, and I'm curious if it could be done better.
A while ago I wrote a factory class that looked something like this:
public class Foo
{
private IDbContext ...
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votes
1
answer
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Posts and Comments - how should I define them in domain driven design?
I am designing a blog in domain driven design. I don't know how I should define models: Post and Comment.
My database:
A user can see a post and related comments. So I think that Post model can be ...
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1
answer
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Two layers of DTO's for API's with Entity Framework
I am building an API which, amongst other things, needs to handle users. I am building it with C# 10 and .NET 6. In order to receive/return data in the API end points, I am using records. So for ...
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4
answers
143
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Adapter or pure interfaces?
I got a bit strange 'future ready' scenario. And I'm not sure if I got it right in regards to C# adapter design pattern.
The scenario is that to be future ready, 'to use the adapter pattern' to easily ...
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2
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Should domain layer have validation logic? [duplicate]
Let's say I have a User class described as follows:
record User (
Guid Id,
string Username,
string Password
)
{
/* some methods */
};
Let's say Usernames and Passwords need at the very least ...
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votes
2
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154
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How to split logging into streams?
I am looking for an advice (or an example) on how to organize logging streams in my cloud app (C#).
In my app there are logging events related to the application infrastructure level and I want to ...
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What does "set" mean in programming languages like C#?
I've been reading a book about C#. What does the word 'set' mean in the following excerpt?
Pattern matching with the switch statement: Like the if statement, the switch statement supports pattern ...
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ASP .NET Core 6 - .razor components - Routing
I come from a background in ASP.NET MVC 5 on .NET 4.8.
I've been trying to wrap my head around the new razor pages, and can't seem to get routing to work, or understand it, even.
I don't want to use ...
0
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2
answers
104
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Make date range generator interface stateful or stateless?
An app has a feature that's much like any calendar application (like the Outlook calendar for example).
Consequently, I need to do a lot of date logic. I wrote a class with date calculation methods ...
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vote
1
answer
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How to test around a giant static class?
I am dealing with an old .net code base which has a PrivilegeChecker static class with hundreds of static methods, each of which takes in some user id and some other params, and then fetches some info ...
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How did you work around covariant return types? Before the language allowed it?
I need some help with design logic, illustrated by an example. My question below.
public class ChangeSet { }
public class NodeChangeSet : ChangeSet { }
public abstract class Base
{
protected ...
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3
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Should you use interfaces or classes in database entities?
Let's say I'm making a library database with books and authors, and I want to model the domain with interfaces, should I also specify the relations in the interfaces?
For example, if I have the ...
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What is the right approach for dynamically creation of SQL-queries?
The problem:
I have a application where the data comes from SQL tables. The design of the tables differs a bit from client to client. Example:
ClientA sells thermometers and the product has features ...
1
vote
1
answer
174
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Circular references with generic classes
I'm trying to create an interaction system for a game I'm developing with Unity and C# and I've been struggling with it for a while now. It consists of interactors and interactables. The idea is that ...
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1
answer
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Compile-time type-safe access to collection with polymorphic items, and extending it
I would like to have type-safe access to items in a collection with polymorphic items at compile-time. For this, I set up the code below as a proof of concept. Passing the DataItemProps instances to ...
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