RicoSuter/NSwag

C# Code Generation doesn't validate patterns

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#3145 opened on Nov 6, 2020

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 (7 comments) (0 reactions) (0 assignees)C# (6,291 stars) (1,189 forks)batch import
help wantedtype: enhancement

Description

Hi everyone,

I noticed that the C# code generation doesn't validate patterns (on the client side). If I annotate a parameter of type string with a pattern (e.g. "^v[1-9]$"), I expect the Api method to throw an ApiException when the supplied string doesn't match the pattern.

I'd be happy to open a PR. Is that something this project could use?

Contributor guide

Tech stack
csharp
Domain
apitooling
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C# programmingNSwag code generationRegular expressions
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Review the NSwag C# code generation implementation to identify where pattern validation is missing. Examine how other code generation targets (e.g., TypeScript) implement pattern validation. Look for files related to C# client generation, likely in the NSwag.CodeGeneration.CSharp namespace. Check existing tests for pattern validation to understand expected behavior.