Question 1

How do I add XML comments to my Swashbuckle documentation?

Accepted Answer

Enable XML documentation output in your project's build settings, then use the IncludeXmlComments method in SwaggerConfig to point to the generated XML file. This automatically pulls summaries and remarks into your Swagger descriptions.

Question 2

Swashbuckle vs NSwag for ASP.NET Web API – which is better?

Accepted Answer

Swashbuckle is more tightly integrated with Web API and includes an embedded UI out of the box, while NSwag offers OpenAPI 3.0 support and client code generation. Choose Swashbuckle for simplicity and embedded UI; NSwag for broader spec compliance and tooling.

Question 3

How can I customize the swagger-ui appearance in Swashbuckle?

Accepted Answer

Use the InjectStylesheet or InjectJavaScript methods in the EnableSwaggerUi configuration to add custom CSS or JS files as embedded resources. For complete control, provide your own index.html via the CustomAsset option.

Question 4

Does Swashbuckle support OpenAPI 3.0?

Accepted Answer

No, Swashbuckle for Web API only supports Swagger 2.0. If you need OpenAPI 3.0, consider alternatives like NSwag or migrate to ASP.NET Core with Swashbuckle.AspNetCore.

Question 5

How to handle multiple API versions in Swashbuckle?

Accepted Answer

Use the MultipleApiVersions method in SwaggerConfig to define versions and a selector for actions, then enable the discovery URL selector in the UI. This allows users to browse docs for different versions interactively.

Question 6

Why does Swashbuckle show a 'Can't read swagger JSON' error?

Accepted Answer

This often stems from routing issues, such as using a version name with a full-stop (e.g., '1.0') that IIS treats as a file extension. Change the version name or adjust the route template to avoid this, as noted in troubleshooting.

Question 7

How to add OAuth2 authentication to Swashbuckle UI?

Accepted Answer

Configure the OAuth2 scheme using the OAuth2 method in SwaggerConfig to describe the flow and scopes, then enable OAuth2 support in the UI with client ID settings. Implement security requirements via custom OperationFilter or DocumentFilter.

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