[Blazor] Add unsupported compat switch for property injection #63493
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Pull Request Overview
This PR adds an unsupported AppContext switch to disable property injection in Blazor's default component factory. The feature allows custom component activators to take full control of property injection by bypassing the framework's built-in @inject property handling.
Key changes:
- Introduces
Microsoft.AspNetCore.Components.Unsupported.DisablePropertyInjectionAppContext switch - Conditionally skips property injection in
InstantiateComponentmethod when switch is enabled - Maintains backward compatibility with opt-in behavior
maraf
approved these changes
Sep 2, 2025
lewing
approved these changes
Sep 2, 2025
lewing
deleted the
javiercn/disable-property-injection-via-app-context-switch
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Add switch to disable property injection in default component factory
Adds an unsupported app context switch to disable property injection within the default component factory. The switch prevents injection of
@injectproperties so a custom activator can handle activation and property population.Description
Adds a new, unsupported AppContext switch that disables property injection for components activated through the default component factory. When enabled, the framework will skip injecting
@injectproperties so that a custom activator (for example, one backed by a different DI container) can perform property activation instead.This change addresses the scenario where component property activation currently always uses the app's DI container and cannot be overridden by custom activators. With the switch, custom implementations that rely on a separate container can take full control of property activation.
Customer Impact
This is not a switch for public consumption but rather a switch we are providing to support first parties in 10.0. On 11.0 we will add a public API to support this scenario and remove this switch.
Regression?
Risk
Justification: The change is gated behind an unsupported AppContext switch and is opt-in. It does not change the default behavior and only affects activation when the switch is explicitly enabled.
Verification
Packaging changes reviewed?