I got some businesslogic I want to handle inside of a .cs file. Depending on the outcome of that, I want to update the blazor UI, EG a toast notification or a variable change. How could I do that?
Thank you in advance.
2 Answers
This is not easy to answer as your question is not specific, and we don't know how proficient you are in programming. However, the following answer may illustrate the path you should take in the context of Blazor:
Your class should be defined as a service, which you should add to the DI container from the Startup class, and injected into your relevant components. This service class, generally speaking, should implement two patterns: The State pattern and the Notifier pattern. The service is supposed to hold some state, as for instance, a given value passed to the service from component A, which trigger an event handler that propagate this fact to other subscribing components, passing them the new value passed from component A via EventArgs or properties. The complicity of the service depends on the functionality you want to expose.
Search Google for strings like "enet stackoverflow Blazor notifier", and such like to see relevant code provided in my answers.
See these links: https://stackoverflow.com/a/62042629/6152891 https://stackoverflow.com/a/66370816/6152891
Comments
You need to use ComponentBase.StateHasChanged in response to whatever is happening in your business logic. Since you didn't post any code it's hard to be more specific but that method will force the relevant component to re-render.
3 Comments
Greenmercy
Thank you for anwsering. But before I make the call to rerender the component, how do I pass values from a class to a blazor component? Is that even possible? Or should all logic be handled inside the component itself?
MrC aka Shaun Curtis
You need to use Blazor Services. Business logic and data layer code live in Services, the UI in Components.
Emperor Eto
@Greenmercy oh I see, you're asking a much bigger question. Like React, Blazor doesn't have any built-in state management framework. There are numerous possible approaches. I like this one personally. github.com/klemmchr/MvvmBlazor