System.TypeLoadException - GenericArguments[x] on '...' violates the constraint of type parameter response.

[aldrashan]

I've defined a couple pipelines and some of them have constraints.
Example:

internal class ValidationPipeline<Request, Response> : IPipelineBehavior<Request, Response>
where Request : IRequest<Response>
where Response : class, ICommandResult

While these pipelines do get executed for the correct arguments (constraints), a System.TypeLoadException error is thrown for Request/Response combinations that violate these constraints. This doesn't break the code, but it does worry me that they show up in the diagnostic tools/logs.

I guess it has something to do with how we register these pipelines?

services.AddScoped(typeof(IPipelineBehavior<,>), typeof(ValidationPipeline<,>));

See also the following issue

Should we modify these pipelines to check our types within the handlers? Would this benefit us at all or is it unnecessary?

[jbogard]

Not necessary, but feel free to upvote this issue: dotnet/runtime#28033 as the only way today to reliably check generic constraints is to try to close the open type and catch the exception.