Why?

Collection expression is useful for small scripts, demonstrations or other non-critical use cases but it is unclear what is actually created behind the scenes.

The source code should be explicitly expressing itself and eliminating "Something working" from the repository is important especially on code review on GitHub (no IDE assist).

Installation

dotnet add package CollectionExpressionKiller

.editorconfig Recommendation

Disable the suggestions relating to collection expressions.

dotnet_diagnostic.IDE0300.severity = silent # Use collection expression for array dotnet_diagnostic.IDE0301.severity = silent # Use collection expression for empty dotnet_diagnostic.IDE0305.severity = silent # Use collection expression for fluent dotnet_diagnostic.IDE0028.severity = silent # Use collection initializers

 

Diagnostics

Ability to disallow all expressions or complicated only.

• CEK001: Disallow all collection expressions.
• CEK002: Disallow expressions with 4 or more elements. (e.g., [1, 2, ..other, 4])
• CEK003: Disallow expressions whose string representation is longer than 12 characters.

How to Disable Analyzer

Disable for entire .cs file with #pragma:

#pragma warning disable CEK001 #pragma warning disable CEK002 #pragma warning disable CEK003 int[] values = [1, 2, 3, 4, ..otherCollection];