[release/8.0] [Blazor] Allow null parameter values to be supplied to interactive components via enhanced page update
#53342
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…components via enhanced page update (#53317)
MackinnonBuck
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Hi @MackinnonBuck. Please make sure you've updated the PR description to use the Shiproom Template. Also, make sure this PR is not marked as a draft and is ready-to-merge. To learn more about how to prepare a servicing PR click here. |
ghost
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Hi @MackinnonBuck. If this is not a tell-mode PR, please make sure to follow the instructions laid out in the servicing process document. |
mkArtakMSFT
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Hi @MackinnonBuck. This PR was just approved to be included in the upcoming servicing release. Somebody from the @dotnet/aspnet-build team will get it merged when the branches are open. Until then, please make sure all the CI checks pass and the PR is reviewed. |
mkArtakMSFT
approved these changes
Jan 17, 2024
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Allow
nullparameter values to be supplied to interactive components via enhanced page updateBackport of #53317
Fixes an issue where a
NullRefrenceExceptionwould be thrown if an enhanced page update supplied anullparameter to an interactive root component.Description
In .NET 8, SSR'd components can supply updated parameters to existing interactive root components. If one of those updated parameters is
null, an exception currently gets thrown from within the framework. This causes the circuit to crash when using Server interactivity, and it would causes an error to be logged in the browser console when using WebAssembly interactivity.This PR fixes the problem by treating
nullas a valid value for a serialized parameter that gets supplied to an interactive root component.Fixes #52434
Customer Impact
Without this fix, customers may encounter the unfriendly exception and have a hard time figuring out the underlying cause. We have not yet seen customer reports of the issue, but it's possible that customers have this bug in their apps without knowing it, especially since it only occurs when supplying updated parameters to existing components (not when supplying the initial set of parameters).
One workaround would be to use a different value than
nullto specify an empty parameter value, but this may not be possible in cases where the parameter gets supplied by the framework (e.g., via route value), or if the interactive root component's implementation is not under the developer's control.Regression?
Only applicable to new scenarios in .NET 8.
Risk
The fix is straightforward and well-tested.
Verification
Packaging changes reviewed?