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Update AV1523: Favor object and collection initializers over separate statements#362

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Update AV1523: Favor object and collection initializers over separate statements#362
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This PR updates guideline AV1523.

It was split out of #298 so the change can be reviewed independently.

Files:

  • _rules/1523.md

Part of the replacement for #298.

Comment thread _rules/1523.md Outdated
Comment thread _rules/1523.md Outdated
Comment on lines +25 to +26
string[] moreCountries = ["Belgium", "Germany"];
string[] allCountries = [..countries, ..moreCountries];
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I wonder what the best spacing would be here. I suppose a single space around the brackets? R#/Rider doesn't have a setting for space around .., but there's a (non-configurable) IDE0xxx analyzer that warns about it.

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I'll prefer the one I'm using there. I've also reached out to JetBrains to ask for a setting.

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot AI review requested due to automatic review settings May 9, 2026 10:41
@dennisdoomen dennisdoomen force-pushed the copilot/pr298-update-av1523 branch from 1602473 to 736af31 Compare May 9, 2026 10:41
@dennisdoomen dennisdoomen merged commit 26a150c into develop May 9, 2026
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@dennisdoomen dennisdoomen deleted the copilot/pr298-update-av1523 branch May 9, 2026 10:42
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Pull request overview

Updates guideline AV1523 to present object/collection initialization using modern C# syntax and refreshed reference links, as part of the broader guidelines refresh split out of #298.

Changes:

  • Replaced “Instead of” counter-example with a positive example using an object initializer.
  • Updated collection examples (List/Dictionary) and added an array/spread (C# 12+) example.
  • Switched the reference link to the current Microsoft Learn documentation.

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Comment thread _rules/1523.md
Comment on lines +12 to +13
StandardOutput = Console.Output,
UseShellExecute = true
Comment thread _rules/1523.md
var countries = new List();
countries.Add("Netherlands");
countries.Add("United States");
new List<string> countries = ["Netherlands", "United States"];
Comment thread _rules/1523.md
```

Use [Object and Collection Initializers](http://msdn.microsoft.com/en-us/library/bb384062.aspx):
This also applies to arrays and the spread operator (C# 12+):
Comment thread _rules/1523.md
["NL"] = "Netherlands",
["US"] = "United States"
};
```csharp
dennisdoomen added a commit that referenced this pull request May 14, 2026
* Make sure the site works properly with Ruby 3.1

* Add AV0100: Understand the boundaries of your codebase (#300)

* Add AV0105: Use design patterns to communicate intent (#301)

* Add AV0110: Prefer composition over class inheritance (#302)

* Add AV0110 guideline

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update _rules/0110.md

Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

* Add AV0112: Apply the Principle of Least Surprise (#303)

* Add AV0115 guideline (#304)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add AV0120: You Ain't Gonna Need It (YAGNI) (#305)

* Add AV0120 guideline

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update _rules/0120.md

Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

* Update _rules/0120.md

Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

* Update _rules/0120.md

Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

* Add AV0125: Don't Repeat Yourself (DRY) within boundaries (#306)

* Update explanation of code boundaries and coupling

Clarified the reasoning for preventing unnecessary coupling between components.

* Add AV0135 guideline (#308)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add AV1582 guideline (#318)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add AV1608 guideline (#323)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add AV1610 guideline (#324)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1708 guideline (#372)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1562 guideline (#368)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1800 guideline (#375)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1521 guideline (#361)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1520 guideline (#360)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1140 guideline (#356)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Remove AV1530: Don't change a loop variable inside a `for` loop or a collection in a `foreach` loop (#363)

* Update AV1530 guideline

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address review comments on AV1530: update title and add foreach collection example

Co-authored-by: dennisdoomen <572734+dennisdoomen@users.noreply.github.com>
Agent-Logs-Url: https://github.com/dennisdoomen/CSharpGuidelines/sessions/983488b6-53b6-4360-876c-4576219b2d4f

* Remove AV1530 rule file entirely

Co-authored-by: dennisdoomen <572734+dennisdoomen@users.noreply.github.com>
Agent-Logs-Url: https://github.com/dennisdoomen/CSharpGuidelines/sessions/0ce85de6-5278-491a-87c7-607ef017b67b

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: dennisdoomen <572734+dennisdoomen@users.noreply.github.com>

* Update AV1250 guideline (#358)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1115 guideline (#352)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1025 guideline (#351)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1020 guideline (#350)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1011 guideline (#348)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1010 guideline (#347)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1003 guideline (#345)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add AV1618 guideline (#326)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add AV1615: Prefer inline literals over constant variables in tests (#325)

* Add AV1615 guideline

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update _rules/1615.md

Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

* Update AV1835 guideline (#378)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1825 guideline (#377)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update AV1000: A class or interface should have a single purpose (#344)

* Update AV1000 guideline

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update _rules/1000.md

Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

* Remove AV2235 guideline (#342)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add AV1602: Postfix test classes with `Specs` instead of `Tests` (#321)

* Add AV1602 guideline

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Rename nested class Order_placement to OrderPlacement

Renamed nested class for better readability.

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add AV1605: Test behavior, not implementation details (#322)

* Add AV1605 guideline

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update _rules/1605.md

Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

* Add General Guidelines page (#385)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add Testability Guidelines page (#386)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update Links & Articles page (#387)

* Update C ov er An dS ty le s page (#384)

* Update AV2400 guideline (#382)

* Split minor site updates from PR 298 (#383)

* Add AV1600 guideline (#320)

* Add AV1578 guideline (#317)

* Update AV1706: Don't use abbreviations (#371)

* Update AV1701 guideline (#370)

* Update AV1755: Only use `Async` or `TaskAsync` as a suffix when a method has both synchronous and asynchronous versions (#374)

* Clarify suffix usage for Async methods (#393)

Follow-up for #374, to align with the replacement of "version" with "variant".

* Update AV2305: Document all `public`, `protected` and `internal` types and members (#381)

* Update AV2202: Prefer language syntax over explicit calls to underlying implementations (#379)

* Update AV1820: Only use `async` for I/O-bound or long-running activities (#376)

* Remove AV1580 guideline (#392)

* AV0125: Consider duplicating simple logic across modules to reduce coupling (#369)

* Update AV1554 guideline (#367)

* Update AV1553 guideline (#366)

* Update AV1546 guideline (#365)

* Update AV1545: Don't use an `if`-`else` construct instead of a simple (conditional) assignment (#364)

* Update AV1523 guideline (#362)

* Update AV1500: Methods should not exceed 15 statements (#359)

* Remove AV1230 guideline (#357)

* Update AV1137: Keep parameters as specific and narrow as possible (#355)

* Update AV1130: Return interfaces to unchangeable collections (#354)

* Update AV1125: Don't expose stateful objects through static members (#353)

* Update AV1013: Don't cast a base class to one of its derived classes (#349)

* Add LSP example with polymorphism to AV1011 (#396)

* Update AV1004: Use an interface rather than a base class to support multiple implementations (#346)

* Remove AV2307 guideline (#343)

* Remove AV2221 guideline (#341)

* Remove AV2201 guideline (#339)

* Remove AV1738 guideline (#338)

Split from #298.

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Remove AV1737 guideline (#337)

* Remove AV1568 guideline (#336)

* Remove AV1532: Avoid nested loops (#334)

* Remove AV1525 guideline (#333)

* Remove AV1510 guideline (#332)

* Remove AV1220 guideline (#331)

* Add AV2308: Document what a member tries to do, not what it does or how it does it (#330)

* Add AV2225: Use deconstruction to simplify variable assignments (#329)

* Add AV1622: Test concrete implementations as part of a larger integration scope (#328)

* Add AV1622 guideline

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update _rules/1622.md

Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>

* Add AV1620: Test reusable components separately from their consumers (#327)

* Add AV1585: Make properties required when they must be set during initialization (#319)

* Add AV1155: Use the `field` keyword in auto-properties when additional logic is needed (#316)

* Add AV1150: Avoid local functions (#315)

* Add AV1145: Use extension members to add behavior without modifying the original type (#314)

* Add AV1035: Use primary constructors when they improve readability (#313)

* Add AV1032: Consider a delegate instead of an interface with a single method (#312)

* Add AV1030: Know when to use a record and when to use a class (#311)

* Add AV1002: Only pass things to a constructor that most or all members need (#309)

* Remove AV2207 guideline (#340)

* Add AV0130: Apply the three pillars of object-oriented programming (#307)

* Fix c# fencing to use csharp in assertion-comparison.html

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Remove severity field from all rules

The severity rating is no longer used. This removes:
- The severity front matter field from all 130 rule files
- The severity icon <img> from the rule-category layout
- The unused severity images (1.png, 2.png, 3.png)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Bart Koelman <10324372+bkoelman@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: dennisdoomen <572734+dennisdoomen@users.noreply.github.com>
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