Blazor 404 code re-execution is compatible with OnNavigateAsync
#64034
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Pull Request Overview
This PR fixes an issue where Blazor 404 re-execution was not working properly when the Router component had an OnNavigateAsync handler. The fix allows rendering to proceed during 404 re-execution scenarios while still preventing it during client-side navigation when lazy loading is in progress.
Key changes:
- Modified the Router component to differentiate between server-side rendering (SSR) scenarios and client-side navigation
- Updated the navigation blocking logic to check if route data is available from SSR before blocking rendering
- Added comprehensive test coverage for the 404 re-execution scenario with
OnNavigateAsync
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| src/Components/Components/src/Routing/Router.cs | Updated navigation logic to allow rendering during SSR/re-execution while maintaining blocking for client navigation |
| src/Components/test/testassets/Components.TestServer/RazorComponents/App.razor | Added test infrastructure with configurable OnNavigateAsync handler and query parameter support |
| src/Components/test/E2ETest/ServerRenderingTests/NoInteractivityTest.cs | Added end-to-end test to verify 404 re-execution works with OnNavigateAsync |
src/Components/test/testassets/Components.TestServer/RazorComponents/App.razor
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src/Components/test/E2ETest/ServerRenderingTests/NoInteractivityTest.cs
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…onents/App.razor Co-authored-by: Copilot <[email protected]>
…tyTest.cs Co-authored-by: Copilot <[email protected]>
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Do not prevent rendering for router that has
OnNavigateAsyncwhen navigation already started.In #24225 we blocked rendering for router that has
OnNavigateAsyncthat is typically used for lazy loading actions. The reason was that rendering was interfering with lazy loading logic in state: #24211.With rendering blocked, 404 re-execution mechanism is not able to render the contents of 404 page. We can differentiate between a situation when SSR match or re-execution happened from a situation when we're performing purely client navigation. In the former case,
RoutingStateProvider?.RouteDatais populated byEndpointHtmlProviderduring SSR.Description
OnNavigateAsyncifRefreshis not triggered by the client.Fixes #63933