This will help future generations maintain this class. Notice that the
protected methods that are going away all just call into another
extensibility point (other than the executor). If we need to we could make
that extensible in the future and then we have the same support with fewer
hooks and less complexity.
This change corrects and ordering bug between the creation of the
'context' and the diagnostic source event that occurs before a synchronous
filter's 'after' stage.
Also made some simple changes to avoid allocating Task<T> in many common
cases. Now we'll only create the Task<T> when we really need it (async
filters).
This change just rearranges some code in the argument binder with a mind
towards performance and clarity. We're removing a few Task<T>'s here as
well in certain cases, but not yet all of them. We additionally save a
dictionary in the case where you have bound properties.
Hopefully these changes break the code into more discrete and sensible
units without multiple levels of indirection without abstraction.
- Main 'driver' code
- BindModel
- ActivateProperty
We want this change to avoid MVC eagerly reading the form. This is good
for general perf and also for scenarios where you want read the body
yourself (large file uploads).
We DO have scenarios where you want to configure the value providers
per-request or also to change the limits on the value providers (form) so
it's worth keeping these around on the context.
When the service receives a model (say, via a POST message) MVC validates it to ensure the model is in a correct state. Validation currently incurs in many allocations that can be avoided. This tackles two of them:
1. We're now caching the generic `GetEnumerator<T>` method infos generated on the fly during collection validation, and
2. We're now only initializing `ModelErrorCollection` on demand.
The first one incurs in the additional allocation of 1 long-lived dictionary object, which will grow only to the amount of `Collection<T>` types used by the model being validated. This is expected to be a small to medium number.
The second change assumes that class `ModelStateEntry` isn't thread safe, as model validation isn't multithreaded.
This resolves#4434 and #4435.
jacalvar
Kiran Challa
mnltejaswini
Ryan Brandenburg
Kristian Hellang
Ryan Nowak
David Obando
Pranav K
Filip W
Sebastien Ros
Doug Bunting
Eilon Lipton