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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

231
votes
18answers
99k 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 ...
212
votes
9answers
21k 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 ...
157
votes
5answers
134k views

When do you use a struct instead of a class? [closed]

What are your rules of thumb for when to use structs vs. classes? I'm thinking of the C# definition of those terms but if your language has similar concepts I'd like to hear your opinion as well. I ...
146
votes
6answers
32k views

SOLID Principles and code structure

At a recent job interview, I couldn't answer a question about SOLID -- beyond providing the basic meaning of the various principles. It really bugs me. I have done a couple of days worth of digging ...
140
votes
7answers
278k views

Relationship between C#, .NET, ASP, ASP.NET etc [closed]

I'm really unclear on the difference between C#, C#.NET and the same for ASP and other '.NET' languages. From what I understand, .NET is a library/framework of... things. I think they're essentially ...
135
votes
8answers
138k 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) ...
114
votes
16answers
22k views

Should I add redundant code now just in case it may be needed in the future?

Rightly or wrongly, I'm currently of the belief that I should always try to make my code as robust as possible, even if this means adding in redundant code / checks that I know won't be of any use ...
104
votes
10answers
84k 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 ...
100
votes
14answers
11k 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)...
98
votes
5answers
9k views

Aren't the guidelines of async/await usage in C# contradicting the concepts of good architecture and abstraction layering?

This question concerns the C# language, but I expect it to cover other languages such as Java or TypeScript. Microsoft recommends best practices on using asynchronous calls in .NET. Among these ...
92
votes
3answers
29k views

Benefits of Structured Logging vs basic logging

We're building a new app and I'd like to include structured logging. My ideal setup would be something like Serilog for our C# code, and Bunyan for our JS. These would feed into fluentd and then could ...
91
votes
8answers
69k views

Is modern C++ replacing C#? Is Microsoft pushing developers to adopt C++? [closed]

I hear about modern C++ popularity and some talks about migrating back to C++ from C# or other C-like languages. I know about C++11 features but I would like to hear your experiences, especially from ...
89
votes
16answers
17k views

Do the young minds need to learn the pointer concepts?

Why did the C master Dennis Ritchie introduce pointers in C? And why did the other programming languages like VB.NET or Java or C# eliminate them? I have found some points in Google, and I want to ...
84
votes
13answers
23k views

Is it considered an anti pattern to write SQL in the source code?

Is it considered an anti pattern to hardcode SQL into an application like this: public List<int> getPersonIDs() { List<int> listPersonIDs = new List<int>(); using (...
84
votes
2answers
107k 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 ...
83
votes
5answers
103k 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 ...
82
votes
11answers
54k 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, ...
79
votes
4answers
21k views

Rich Domain Models — how, exactly, does behavior fit in?

In the debate of Rich vs. Anemic domain models, the internet is full of philosophical advice but short on authoritative examples. The objective of this question is to find definitive guidelines and ...
78
votes
8answers
37k 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 ...
77
votes
11answers
10k 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 ...
76
votes
17answers
29k views

Coding Guideline : Methods shouldn't contain more than 7 statements?

I was looking through the AvSol Coding Guidelines for C# and I agree with nearly everything but I'm really curious to see what other think of one specific rule. AV1500 Methods should not ...
76
votes
6answers
17k 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 ...
74
votes
11answers
11k 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 ...
72
votes
10answers
12k 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 ...
72
votes
9answers
62k views

Why use partial classes?

In my understanding, the partial keyword does nothing but allow a class to be split between several source files. Is there any reason to do this other than for code organization? I've seen it used for ...
71
votes
8answers
53k views

A practical use of “yield” keyword in C# [closed]

After almost 4 years of experience, I haven't seen a code where yield keyword is used. Can somebody show me a practical usage (along explanation) of this keyword, and if so, aren't there other ways ...
69
votes
5answers
11k views

Why would you not use the 'using' directive in C#?

The existing coding standards on a large C# project includes a rule that all type names be fully qualified, forbidding employment of the 'using' directive. So, rather than the familiar: using System....
69
votes
7answers
73k 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 ...
67
votes
16answers
8k views

How much freedom should a programmer have in choosing a language and framework?

I started working at a company that is primarily C# oriented. We have a few people who like Java and JRuby, but a majority of programmers here like C#. I was hired because I have a lot of experience ...
67
votes
8answers
10k views

Naming issues: Should “ISomething” be renamed to “Something”? [closed]

Uncle Bob's chapter on names in Clean Code recommends that you avoid encodings in names, mainly regarding Hungarian notation. He also specifically mentions removing the I prefix from interfaces, but ...
66
votes
12answers
13k views

Does a constructor that validates its arguments violate SRP?

I am trying to adhere to the Single Responsibility Principle (SRP) as much as possible and got used to a certain pattern (for the SRP on methods) heavily relying on delegates. I'd like to know if this ...
65
votes
7answers
15k views

If functions have to do null checks before doing the intended behaviour is this bad design?

So I don't know if this is good or bad code design so I thought I better ask. I frequently create methods that do data processing involving classes and I often do a lot of checks in the methods to ...
64
votes
11answers
19k views

How can I convince my boss that ANSI C is inadequate for our new project? [closed]

A few months ago, we started developing an app to control an in-house developed test equipment and record a set of measurements. It should have a simple UI, and would likely require threads due to the ...
63
votes
11answers
7k views

Is a big boolean expression more readable than the same expression broken down into predicate methods? [closed]

What is easier to understand, a big boolean statement (quite complex), or the same statement broken down into predicate methods (lots of extra code to read)? Option 1, the big boolean expression: ...
63
votes
9answers
14k views

What is a proper use of downcasting?

Downcasting means casting from a base class (or interface) to a subclass or leaf class. An example of a downcast might be if you cast from System.Object to some other type. Downcasting is unpopular, ...
63
votes
11answers
9k views

Does this class design violate the single responsibility principle?

Today I had an argument with someone. I was explaining the benefits of having a rich domain model as opposed to an anemic domain model. And I demoed my point with a simple class looking like that: ...
61
votes
3answers
8k views

&& and || are not logical but conditional operators?

I am a bit confused by the MSDN C# documentation which states that &,| are logical operators and && and || are conditional operators. I keep calling &&, ||, ! logical operators, ...
58
votes
17answers
25k 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 ...
57
votes
9answers
8k 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, ...
56
votes
6answers
23k views

Why was C# made with “new” and “virtual+override” keywords unlike Java?

In Java there are no virtual, new, override keywords for method definition. So the working of a method is easy to understand. Cause if DerivedClass extends BaseClass and has a method with same name ...
55
votes
12answers
28k 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 ...
54
votes
3answers
22k views

Should we include Nuget PACKAGE folder in version control?

I would like to know In C# or VB.NET project should we include the PACKAGE folder (nugget package folder that is created to the root of my project that contain the nupkg files and other content) to ...
53
votes
7answers
15k 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 ...
53
votes
8answers
8k 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 ...
52
votes
7answers
12k 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 ...
52
votes
2answers
14k views

Why is 'void' not allowed as a generic type in C#

What were the design decisions that argued in favour of void not being constructable and not being allowed as a generic type? After all it is just a special empty struct and would have avoided the ...
50
votes
6answers
24k views

When to use weak references in .Net?

I have not personally come across a situation where I've needed to use WeakReference type in .Net, but the popular belief seems to be that it should be used in caches. Dr Jon Harrop gave a very good ...
49
votes
11answers
4k views

I don't understand how TDD helps me get a good design if I need a design to start testing it

I'm trying to wrap my head around TDD, specifically the development part. I've looked at some books, but the ones I found mainly tackle the testing part - the History of NUnit, why testing is good, ...
48
votes
11answers
25k views

Why are /// comment blocks important?

Someone once said we should prefix all our methods with the /// <summary> comment blocks (C#) but did not explain why. I started to use them and found they annoyed me quite a bit, so stopped ...
47
votes
9answers
14k views

Why is a while(true) loop in a constructor actually bad?

Albeit a general question my scope is rather C# as I am aware that languages like C++ have different semantics regarding constructor execution, memory management, undefined behaviour, etc. Somebody ...