Questions tagged [extension-methods]
Methods that extend a given type, adding functionality to any instance of that type, even if the type in question is defined in a separate assembly. For example, a "Disemvowel" extension method could be written to add disemvoweling functionality to any "String" object.
169
questions
2
votes
1answer
88 views
Pass class property as parameter to extension method
I have the following class structure:
MyAttribute.cs
...
2
votes
1answer
70 views
Programmatically getting the GUID of an application
Intrigued by the events chronicled here (also here and here), I saw the inherent utility in having a program-specific GUID available. The SO answers that were correct seemed a bit tightly-coupled and ...
1
vote
0answers
49 views
Extension method: Task<T>.CoalesceAwait
There has been ongoing concern about the question of awaiting a task that could possibly be null, as when using null-coalescing operators. Consider the following:
...
2
votes
1answer
64 views
Extension method for getting custom Principal Claim
I'm writing extension methods to shorten the code required to get custom Claims from an IPrincipal. I have two general forms for ...
17
votes
6answers
6k views
Solving Fizz Buzz using LINQ in C#
The Fizz Buzz challenge is well-known and should not need any explanations, right?
I recently got a bit bored and came up with a solution for Fizz Buzz using LINQ and even asynchronous code and a lot ...
7
votes
1answer
308 views
String Format object extension
I wrote an extension to create a string-representation by an object:
...
3
votes
1answer
371 views
Dotty 0.19 (Scala 3) features: contextual abstractions
tl;dr
I tried to write some as general and as feasible as possible code where entities are able to communicate with other entities of the same type or of different types, allowing for the recipient ...
3
votes
1answer
99 views
Removing duplicate Unicode characters
Motivation
I came across an interesting question on SO: determine-if-string-has-all-unique-characters and thought about providing an extension method to enable duplicate removal given some kind of ...
2
votes
0answers
58 views
Convenient way to make an UIImageView ExpressibleByStringLiteral
I want to reduce boiler-plate code and write like this when developing in iOS:
let imgView: UIImageView = "share_fareware_text_bg"
Here is implementation code:
<...
7
votes
3answers
740 views
LINQ Extension methods MinBy and MaxBy
LINQ Extension
I present a LINQ method ArgBy that returns the item of a sequence that corresponds to the predicate specified. Two additional methods ...
5
votes
2answers
249 views
Generic Extension Method To Count Descendants
I've created a extension method to count every available descendant starting from a single, given key.
The data is a flat list, there's is no hierarchical structure. (Well, not entirely true. There ...
6
votes
4answers
2k views
LINQ for generating all possible permutations
Permutate() is supposed to generate all possible permutations of the source sequence:
...
3
votes
1answer
85 views
LINQ for extracting N bottom items (async streams)
source.Bottom(n, x => x) should be the same as well known LINQ source.OrderBy(x => x).Take(n) but is more memory/run-time ...
6
votes
1answer
82 views
Distinguish between different types of log items in a dictionary by their key
My logging adapter is using a dictionary for storing data that is passed from middleware to middleware.
It is a one-liner:
...
1
vote
1answer
57 views
Insert new middleware at the “right” location
I need to have my logger middlewares (nodes of a linked-list) in the right order so that they complement each other and work as desired.
Any known middleware can be inserted anytime but the first and ...
4
votes
0answers
99 views
Toggle any application feature ON or OFF - follow-up (v2)
This is the second version of my FeatureToggle service (see previous question). It still has the same purpose which is to help control whether a feature is ...
16
votes
3answers
2k views
ExactlyOne extension method
I often find in codebases something on the order of if (sprockets.Count() > 0) which is easily replaced with LINQ's ...
1
vote
0answers
29 views
Extensible tree header context menu
I have a Qt tree view which has a custom tree header. The tree has a so called mode, by default there are two. During each of the modes a different tree is shown. The mode switcher is presented as a ...
7
votes
5answers
541 views
Grouping into more groups in one iteration
I had a need to group the same dataset in several groups. So instead of repeatedly query the dataset, I made an extension that could do it once. The caveat is, that the result is materialized in ...
5
votes
2answers
502 views
Reducing using/foreach/using nesting with a helper extension
Problem statement
There are sometimes foreach scenarios that require deep nesting due to multiple disposable objects involved that look like this:
...
5
votes
3answers
315 views
SkipLast of an IEnumerable<T> - Linq Extension
As my answer to this question, I came up with this solution:
...
6
votes
3answers
304 views
Simple object validator with a new API
Quite some time ago I have created the Simple object validator (see also self-answer). The more I used it the more I thougt its API could be better so I have heavily refactored it and would like to ...
5
votes
2answers
791 views
Fetch and print all properties of an object graph as string
Below I have setup an extension method that takes any object, cycles through its properties, and prints each out to a Console window in the format Name: Value.
...
2
votes
2answers
204 views
Build WHERE clause for search conditions [closed]
Here is a set of classes that are used to build where clause for SQL Server and Oracle for different field types e.g. text, <...
6
votes
1answer
167 views
Enumerate all members and types with specific attributes
I have a use-case where I need to retrieve all members with specific attributes in the class and interface hierarchy - I usually need the first match and apply its rules to child members. The built-in ...
1
vote
0answers
37 views
string.To2DCharArray extension method implementation
I would like to ask a code review for the class below.
I am asking this because VS showed a quite low Maintainability Index of 54 and I am wondering if it is good code.
I know I could have extracted ...
3
votes
0answers
29 views
Configure multiple application features by common criteria
My FeatureSerivce provides only basic APIs, so it is good in dealing with single features. Like I can configure only one feauture at a time:
...
2
votes
2answers
70 views
Creating keys/names from interfaces to avoid strings
There are many APIs that require some kind of a string key/name. I usually try to avoid using raw strings and prefer to use ...
-1
votes
1answer
64 views
How to divide a large method into 2 smaller methods [closed]
I have created a method that is responsible for the creation and the saving of memes. This is a huge mistake because now I need to use 1 of those functionalities (creating) for a different purpose. I ...
2
votes
2answers
449 views
Formatting a price in Swift using an extension vs. a class
I have a price as a Double, which I should format it as a String.
Should I use an extension instead of classical class to ...
1
vote
0answers
82 views
Extension “With” for immutable types
(My code is basically a rewrite of https://github.com/ababik/Remute so much of the credit goes there)
The idea is to use lambda expression to provide a general With...
-2
votes
3answers
42 views
Refactorizing overloads with the same scope but different calls [closed]
Well I have 3 methods that are overloads, but in it's scope has the same scope except one method call.
...
5
votes
2answers
687 views
Generic extension to transform a flat nested list to hierarchy list
I have a collection of items in my database with a ParentId property. I'm reading the categories as a flat structure and I would like to convert it to a hierarchy list by populating the ParentCategory ...
4
votes
1answer
79 views
Immutable type updater using a special constructor
I wanted to update some properties of my UriString but since this type is immutable, it wouldn't work. Actually, I just wanted to update the Path property but I don'...
2
votes
1answer
71 views
Squeezing decorators into functional extensions
When you try to use several decorators it can get ugly pretty quickly and you'll end up with:
...
8
votes
4answers
1k views
Custom implementation of the linq Zip operator for different length lists
Based on my answer I have my implementation of linq Zip operator which operates on different length lists, and loops shortest list.
My implementation:
...
3
votes
1answer
85 views
Determining if there is data left after fetching a page of data
I just faced a problem where I needed to know if extra data was present in a given collection after a Take operation took place. Specifically, this is related to ...
1
vote
2answers
119 views
Converting a String to USD
I'm working on a clientside iOS app for my school that involves students purchasing things, and I wrote a String extension for formatting a ...
3
votes
2answers
1k views
Writing a generic casting extension-method
I'm writing a C# extension-method that converts any object to a type. E.g. the method shall convert a string with value "y" to a ...
1
vote
2answers
768 views
Generic TryParse extension method for the standard value types
I often need to update properties using the out parameter of the standard TryParse methods. However, use of a property as ...
7
votes
2answers
499 views
Parsing small data into tuples
I'd like to make parsing small samples of data more efficient (from the developer point of view). This means, instead of writing the parsing logic each time from scratch when I encounter something as ...
6
votes
2answers
3k views
Split string with adding separator to substring
I wrote my Split() extension, it's main goal is to save delimiters and add them to splitted strings.
For example:
I have a string ...
5
votes
1answer
59 views
Utilities for Various Builtins #2
This is the final iteration of an iterative review. The previous iteration can be found here: Utilities for various builtins #1
This code solves the following issue:
...
1
vote
1answer
40 views
Utilities for various builtins #1
This is an iterative review. The next iteration is located here: Utilities for Various Builtins #2
This code puts several builtins (And a few non-builtins) into the base classes.
...
3
votes
2answers
484 views
Kotlin extension functions with null checks
Kotlin defines extension functions like also but they are not null checked. That's fine because you might not need the check. In case you do though, do you see any ...
8
votes
4answers
763 views
Selective updates to immutable types
There is a way in Scala to selectively change a field while making a copy of the immutable object:
...
4
votes
2answers
173 views
Initializing an Array of Alternating Values
My goal in this project is to make something that can—as, quickly, effectively, and efficiently as Array(repeating: , count: )—initialize an ...
6
votes
2answers
717 views
Finding MinMax values and returning a tuple as a result
I was coding some tooling stuff when I started to ponder whether the best return type for a Range / MinMax method applied on a IEnumerable method.
I am using the value the C# 7 Tuples like below, but ...
4
votes
2answers
678 views
Scheduler built with observables
I sometimes have to schedule some tasks and wanted to have my own reusable scheduler. Since I like the Rx, I build it on top of it.
Follow-up
There is a newer version of the ...
6
votes
1answer
382 views
Slices of Strings
In an attempt to summarize the question and all the good answers to this question, I decided to try to write a pair of string extensions that could
split a string in respect to number of slices
...
