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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299 votes
19 answers
144k 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 ...
249 votes
11 answers
28k 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 ...
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182 votes
5 answers
175k 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 ...
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164 votes
3 answers
65k 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 ...
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159 votes
6 answers
37k 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 ...
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  • 1,397
157 votes
8 answers
176k 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) ...
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149 votes
7 answers
299k 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 ...
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  • 2,006
136 votes
4 answers
180k 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 ...
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  • 2,099
125 votes
10 answers
107k 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 ...
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  • 1,439
118 votes
16 answers
23k 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 ...
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  • 2,053
108 votes
5 answers
13k 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 ...
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103 votes
14 answers
12k 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)...
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  • 3,516
101 votes
6 answers
138k views

Should we create a new single instance of HttpClient for all requests?

recently I came across this blog post from asp.net monsters which talks about issues with using HttpClientin following way: using(var client = new HttpClient()) { } As per the blog post, if we ...
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  • 1,568
98 votes
14 answers
39k 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 (...
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  • 6,855
97 votes
4 answers
29k 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 ...
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  • 2,050
94 votes
8 answers
70k 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 ...
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  • 1,222
94 votes
8 answers
50k 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 ...
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92 votes
16 answers
20k 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 ...
92 votes
11 answers
82k 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, ...
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  • 3,978
91 votes
5 answers
125k 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 ...
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  • 1,011
86 votes
11 answers
12k 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 ...
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  • 6,937
85 votes
11 answers
15k 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 ...
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  • 1,145
85 votes
10 answers
16k 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 ...
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  • 1,033
84 votes
9 answers
19k views

When to use / not use syntactic sugar

Currently I am working on a school project written in C#. Some teammates just started in C# and some are already familiar with C#. Today I had a discussion on whether to use syntactic sugar like this ...
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82 votes
12 answers
26k views

What is the utility and advantage of getters & setters especially when they are merely used to read and assign values to properties of an object? [closed]

I’m still really new to learning to program. Just learning the syntax for a few programming languages at the moment. The courses I viewed for C# and Java touched only very briefly on getters & ...
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81 votes
17 answers
35k 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 ...
80 votes
3 answers
43k views

Should we include the NuGet PACKAGE folder in version control?

In a C# or VB.NET project, should we include the PACKAGE folder (NuGet package folder that is created in the root of my project that contains the nupkg files and other content) to our source control ...
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80 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 ...
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79 votes
5 answers
16k 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....
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  • 1,182
78 votes
10 answers
39k 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, ...
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  • 3,367
78 votes
8 answers
59k 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 ...
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76 votes
9 answers
68k 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 ...
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  • 15.4k
73 votes
8 answers
24k 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 ...
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70 votes
7 answers
25k 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 ...
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  • 2,000
70 votes
7 answers
20k 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 ...
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70 votes
7 answers
80k 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 ...
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  • 9,262
69 votes
8 answers
14k 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 ...
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69 votes
5 answers
39k views

What's the difference between implementing an Interface explicitly or implicitly?

In Visual Studio I can right-click on an interface and choose to Implement Interface, or Implement Interface Explicitly. public class Test : ITest { public string Id // Generated by Implement ...
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  • 23.9k
68 votes
12 answers
14k 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 ...
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67 votes
16 answers
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 ...
66 votes
12 answers
42k 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 ...
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  • 2,257
65 votes
12 answers
12k views

Having a flag to indicate if we should throw errors

I recently started working at a place with some much older developers (around 50+ years old). They have worked on critical applications dealing with aviation where the system could not go down. As a ...
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  • 707
64 votes
11 answers
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 ...
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  • 1,955
64 votes
10 answers
11k 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, ...
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  • 1,643
64 votes
12 answers
13k 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: ...
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  • 787
64 votes
5 answers
69k views

Why do C# developers newline opening brackets?

I've spent most of the last several years working mainly with C# and SQL. Every programmer I've worked with over that time was in the habit of placing the opening brace of a function or control flow ...
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  • 3,516
63 votes
11 answers
8k 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: ...
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  • 1,035
63 votes
17 answers
35k 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 ...
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62 votes
6 answers
27k 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 ...
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62 votes
3 answers
11k views

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

I am a bit confused by the MSDN C# documentation which states that & and | are logical operators and that && and || are conditional operators. I keep calling &&, || and ! logical ...
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