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Questions tagged [c#]

C# is a multiparadigm, managed, garbage-collected object-oriented programming language created by Microsoft in parallel with the .NET platform

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50 votes
2 answers
25k 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 ...
Carl Sagan's user avatar
71 votes
8 answers
22k views

How do you encode Algebraic Data Types in a C#- or Java-like language?

There are some problems which are easily solved by Algebraic Data Types, for example a List type can be very succinctly expressed as: data ConsList a = Empty | ConsCell a (ConsList a) consmap f ...
Jörg W Mittag's user avatar
96 votes
8 answers
54k views

Return magic value, throw exception or return false on failure?

I sometimes end up having to write a method or property for a class library for which it is not exceptional to have no real answer, but a failure. Something cannot be determined, is not available, not ...
Daniel A.A. Pelsmaeker's user avatar
5 votes
1 answer
2k views

Derive from a base class but not include a condition in the base class's method

The current code looks like this: public class Details { Public void Populate() { WriteChapterDetails(); } public void WriteChapterDetails() { if ( ...
Tarveen's user avatar
  • 71
69 votes
12 answers
46k views

Is catching general exceptions really a bad thing?

I typically agree with most code analysis warnings, and I try to adhere to them. However, I'm having a harder time with this one: CA1031: Do not catch general exception types I understand the ...
Bob Horn's user avatar
  • 2,337
93 votes
11 answers
86k views

Is static universally "evil" for unit testing and if so why does Resharper recommend it? [closed]

I have found that there are only 3 ways to unit test (mock/stub) dependencies that are static in C#.NET: Moles TypeMock JustMock Given that two of these are not free and one has not hit release 1.0, ...
Vaccano's user avatar
  • 4,048
72 votes
7 answers
81k views

When to use abstract classes instead of interfaces with extension methods in C#?

"Abstract class" and "interface" are similar concepts, with interface being the more abstract of the two. One differentiating factor is that abstract classes provide method implementations for derived ...
Gulshan's user avatar
  • 9,462
254 votes
12 answers
30k views

Why do many exception messages not contain useful details?

It seems there is a certain amount of agreement that exception messages should contain useful details. Why is it that many common exceptions from system components do not contain useful details? A few ...
Martin Ba's user avatar
  • 7,637
309 votes
19 answers
162k views

Are #regions an antipattern or code smell?

C# allows the use of #region/#endregion keywords to make areas of code collapsible in the editor. Whenever I do this though I do it to hide large chunks of code that could probably be refactored into ...
30 votes
5 answers
15k views

Would you rather make private stuff internal/public for tests, or use some kind of hack like PrivateObject?

I am quite a beginner in code testing, and was an assert whore before. One thing worrying me in unit testing is that is often requires you to make public (or at least internal) fields that would have ...
Zonko's user avatar
  • 785
88 votes
11 answers
13k views

Did the developers of Java consciously abandon RAII?

As a long-time C# programmer, I have recently come to learn more about the advantages of Resource Acquisition Is Initialization (RAII). In particular, I have discovered that the C# idiom: using (var ...
JoelFan's user avatar
  • 7,091
63 votes
10 answers
12k views

Readability versus maintainability, special case of writing nested function calls

My coding style for nested function calls is the following: var result_h1 = H1(b1); var result_h2 = H2(b2); var result_g1 = G1(result_h1, result_h2); var result_g2 = G2(c1); var a = F(result_g1, ...
Dominique's user avatar
  • 1,788
35 votes
6 answers
28k views

Explicitly defining variable data types vs. using the keyword 'var'? [closed]

In C#, am I encouraged to use the all-purpose var keyword for every variable declaration? If yes, do I have to mention those special characters for literal values within the variable declaration like ...
wassimans's user avatar
  • 1,173
22 votes
1 answer
2k views

Unit testing for a scientific computing library

I've had a bit of experience with unit testing before, in what I call (not pejoratively) the classic software engineering project: an MVC, with a user GUI, a database, business logic in the middle ...
Alejandro Piad's user avatar
18 votes
3 answers
9k views

Should Entity Framework 6 not be used with repository pattern?

So I am asking this after reading the following: Why shouldn't I use the repository pattern with Entity Framework?. It seems there is a large split of people who say yay and those that say nay. ...
MZawg's user avatar
  • 423
9 votes
2 answers
4k views

Zero argument constructors and Always Valid entities

I have done a lot of reading recently about Always Valid domain entities. I have come to believe that in order to ensure the entities are always valid I need to: 1) Remove primitive obsession and ...
w0051977's user avatar
  • 7,119
88 votes
11 answers
18k views

Is it a bad practice to modify code strictly for testing purposes

I have a debate with a programmer colleague about whether it is a good or bad practice to modify a working piece of code only to make it testable (via unit tests for example). My opinion is that it ...
liortal's user avatar
  • 1,175
64 votes
17 answers
37k views

Why use an OO approach instead of a giant "switch" statement?

I am working in a .Net, C# shop and I have a coworker that keeps insisting that we should use giant Switch statements in our code with lots of "Cases" rather than more object oriented approaches. His ...
James P. Wright's user avatar
36 votes
2 answers
37k views

Separating data access in ASP.NET MVC

I want to make sure I'm following industry standards and best practices with my first real crack at MVC. In this case, it's ASP.NET MVC, using C#. I will be using Entity Framework 4.1 for my model, ...
scott.korin's user avatar
13 votes
4 answers
3k views

Is the usage of internal scope blocks within a function bad style?

There are some (quite rare) cases where there is a risk of: reusing a variable which is not intended to be reused (see example 1), or using a variable instead of another, semantically close (see ...
Arseni Mourzenko's user avatar
57 votes
8 answers
9k views

Why a static main method in Java and C#, rather than a constructor?

I’m Looking for a definitive answer from a primary or secondary source for why (notably) Java and C# decided to have a static method as their entry point, rather than representing an application ...
Konrad Rudolph's user avatar
33 votes
6 answers
6k views

I'd like to write an "ultimate shuffle" algorithm to sort my mp3 collection

I'm looking for pseudocode suggestions for sorting my mp3 files in a way that avoids title and artist repetition. I listen to crooners - Frank Sinatra, Tony Bennett, Ella Fitzgerald etc. singing old ...
DeveloperDan's user avatar
142 votes
4 answers
198k views

Creating database connections - Do it once or for each query?

At the moment I create a database connection when my web page is first loaded. I then process the page and run any queries against that conection. Is this the best way to do it or should I be creating ...
webnoob's user avatar
  • 2,159
105 votes
14 answers
13k views

At what point is brevity no longer a virtue?

A recent bug fix required me to go over code written by other team members, where I found this (it's C#): return (decimal)CostIn > 0 && CostOut > 0 ? (((decimal)CostOut - (decimal)...
Bob Tway's user avatar
  • 3,636
85 votes
10 answers
17k views

Exceptions, error codes and discriminated unions

I've recently started a C# programming job, but I've got quite a bit of background in Haskell. But I understand C# is an object-orientated language, I don't want to force a round peg into a square ...
Clinton's user avatar
  • 1,083
56 votes
3 answers
72k views

Which is a better practice - helper methods as instance or static?

This question is subjective but I was just curious how most programmers approach this. The sample below is in pseudo-C# but this should apply to Java, C++, and other OOP languages as well. Anyway, ...
Ilian's user avatar
  • 663
43 votes
3 answers
63k views

What is message passing in OO?

I've been studying OO programming, primarily in C++, C# and Java. I thought I had a good grasp on it with my understanding of encapsulation, inheritance and polymorphism. One frequently referenced ...
Tom's user avatar
  • 852
33 votes
3 answers
30k views

Is it bad practice to use public fields? [duplicate]

Possible Duplicate: When are Getters and Setters Justified Why are public and private accessors considered good practice? In my time as developer I learned that properties can be very useful. I ...
Jonathan Egerton's user avatar
29 votes
9 answers
11k views

When is primitive obsession not a code smell?

I have read plenty of articles recently that describe primitive obsession as a code smell. There are two benefits of avoiding primitive obsession: It makes the domain model more explicit. For ...
w0051977's user avatar
  • 7,119
158 votes
8 answers
179k views

How do you organize your projects? [closed]

Do you have any particular style of organizing projects? For example, currently I'm creating a project for a couple of schools here in Bolivia, this is how I organized it: TutoMentor (Solution) ...
user avatar
94 votes
5 answers
129k views

for vs. foreach vs. LINQ

When I write code in Visual Studio, ReSharper (God bless it!) often suggests me to change my old-school for loop in the more compact foreach form. And often, when I accept this change, ReSharper goes ...
beccoblu's user avatar
  • 1,041
73 votes
8 answers
25k views

Single Responsibility Principle - How Can I Avoid Code Fragmentation?

I'm working on a team where the team leader is a virulent advocate of SOLID development principles. However, he lacks a lot of experience in getting complex software out of the door. We have a ...
Dean Chalk's user avatar
19 votes
11 answers
57k views

Recommended .NET / C# coding standards? [closed]

What coding standards do you think are important for .NET / C# projects? This could be anything from dealing with curly braces and spacing and pedantry like that. Or it could be more fundamental ...
RationalGeek's user avatar
  • 10.1k
16 votes
3 answers
16k views

What is the benefit to having pure POCO models?

What is the major benefit of having pure POCO models? I get that Models should be clean and simple, but I tend to like to keep the maintenance of child objects within the model classes. For example ...
Jesse's user avatar
  • 321
12 votes
9 answers
4k views

How can designing for inheritance cause extra cost? [closed]

So I wanted to inherit from a sealed class in csharp and got burned. There is just no way to unseal it unless you have access to the source. Then it got me thinking "why sealed even exists?". 4 ...
cregox's user avatar
  • 697
11 votes
3 answers
33k views

Repository Pattern and Joined Queries

In conjunction with Unit Tests and Dependency Injection I (and my primary coworker) are exploring Repositories. However we cannot come to a solid plan of action for implementation. In a basic ...
gilliduck's user avatar
  • 237
8 votes
3 answers
7k views

What is the "best" way to approach validation from the perspective of a DDD purist?

I recently asked this question. I am trying to decide where to put the validation in a DDD app. I believe it should be done at every layer. I am now concentrating on the Domain model. I was ...
w0051977's user avatar
  • 7,119
7 votes
2 answers
7k views

Object Initializer in C# problem with readability

I wonder if object initializing have some performance gain in ASP.NET website. I have an office mate that told me that object initialization is much readable and faster than constructor. But one of my ...
JRC's user avatar
  • 173
7 votes
3 answers
1k views

Should conditional logic be always coded via type system where possible?

I have a choice. Option 1: public class Sample { bool IsRelevant { get; set; } } Option 2: public class Sample { } public class RelevantSample : Sample { } Is there a clear well-known rule ...
Den's user avatar
  • 4,847
3 votes
5 answers
9k views

MVC4 : How to create model at run time?

In my project I am dynamically creating table by giving table name (ex. student) and adding fields to that table and then save table. Now, my table is created in SQL Server database. Assume table ...
Vicky's user avatar
  • 39
128 votes
10 answers
110k views

Don't Use "Static" in C#?

I submitted an application I wrote to some other architects for code review. One of them almost immediately wrote me back and said "Don't use static. You can't write automated tests with static ...
Infin8Loop's user avatar
  • 1,469
82 votes
6 answers
19k views

When to go Fluent in C#?

In many respects I really like the idea of Fluent interfaces, but with all of the modern features of C# (initializers, lambdas, named parameters) I find myself thinking, "is it worth it?", and "Is ...
Andrew Hanlon's user avatar
48 votes
5 answers
36k views

async+await == sync?

Stumbled upon this post that talks about making async web requests. Now simplicity aside, if in real world, all you do is make an async request and wait for it in the very next line, isn't that the ...
Mrchief's user avatar
  • 631
46 votes
11 answers
394k views

For what reasons should I choose C# over Java and C++? [closed]

C# seems to be popular these days. I heard that syntactically it is almost the same as Java. Java and C++ have existed for a longer time. For what reasons should I choose C# over Java and C++?
Dark Templar's user avatar
  • 6,323
46 votes
6 answers
77k views

What is the best way to initialize a child's reference to its parent?

I'm developing an object model that has lots of different parent/child classes. Each child object has a reference to its parent object. I can think of (and have tried) several ways to initialize the ...
Steven Broshar's user avatar
42 votes
8 answers
45k views

Private variable vs property?

When setting a value to a variable inside of a class most of the time we are presented with two options: private string myValue; public string MyValue { get { return myValue; } set { myValue = ...
Edward's user avatar
  • 2,169
40 votes
11 answers
4k views

Should a developer always use version control [duplicate]

Possible Duplicate: Version control for independent developers? I've heard statements to the effect of: "Well it's just me working on this project so I don't need to put it under source control" ...
user77232's user avatar
  • 511
39 votes
6 answers
34k views

Try/Catch/Log/Rethrow - Is Anti Pattern?

I can see several post where importance of handling exception at central location or at process boundary been emphasized as a good practice rather than littering every code block around try/catch. I ...
rahulaga-msft's user avatar
39 votes
9 answers
49k views

Constructor parameter validation in C# - Best practices

What is the best practice for constructor parameter validation? Suppose a simple bit of C#: public class MyClass { public MyClass(string text) { if (String.IsNullOrEmpty(text)) ...
MPelletier's user avatar
  • 2,058
31 votes
4 answers
4k views

Why do we need the async keyword?

I just started playing around with async/await in .Net 4.5. One thing I'm initially curious about, why is the async keyword necessary? The explanation I read was that it is a marker so the compiler ...
ConditionRacer's user avatar

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