Add support for rendering Blazor components on applying a hot reload delta (original) (raw)

• Assume some mechanism exists that notifies the framework when a delta is applied.
• We introduce a new contract that is implemented by ComponentBase. This allows components to subscribe to events that make them aware that a rendering is being triggered as a response to delta apply event:

IHotReloadableComponent { void UseHotReloadableContext(HotReloadableContext context); }

class HotReloadableContext { bool IsHotReloading(); }

• ComponentBase.ShouldRender() is ignored when Context.IsHotReloading() returns true.
• RenderRootComponentAsync stashes away root component parameters when we know hot reload is enabled for the app (look for the environment variable) and uses this to trigger a render when delta is applied.