Web-api giving exception on clicking Dashboard in Blazor frontend

[Sarmadjavediqbal]

Web-api is throwing exception after clicking Dashboard in frontend (blazor-wasm).

[Sarmadjavediqbal]

any solutions??? s’il vous plaît

[MikaelHild]

Not sure, but it could be related to this:

https://github.com/jbogard/MediatR/issues/701

[Sarmadjavediqbal]

I found the solution. The definition of the Interface (IPipelineBehavior<TRequest, TResponse>) is:

Task Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate next);

where as the class ValidationBehavior was implementing the above definition in wrong sequence as below:

Task Handle(TRequest request, RequestHandlerDelegate next, CancellationToken cancellationToken)

The definitions in both lines look the same but work differently. So I switched these two and it works just fine. Thanks @MikaelHild again for guiding.

It took a while but a little focus on the little details can save you hours of research.