This change rewrites simple and safe Expression<Func<T, U>> expressions
into accesses to readonly fields. This allows us to cache the actual
expression and avoid repeatedly allocating and compiling it.
The rewrite is limited to cases where we know that the expression doesn't
capture, and where we support that kind of expression for evaluating
viewdata. In practice this means 'indentity' and property accessors are
allowed.
This change fixes call sites on the main request path for a simple site
(model binding, validation, views) that allocate boxed list enumerators.
Some cases aren't addressed by this change because the fix is too invasive
or requires changing an important contract to take IList instead of
IEnumerable. Will follow up on those case by case in order of importance.
Abstractions - Core MVC extensibility
Controllers - MVC implementations of .Abstractions and supporting
contracts
Infrastructure - General purpose support APIs. Metadata APIs that don't
fit clearly with a feature or with .Abstraction
- The corresponding Razor change results in `HelperResult`s being rendered with async lambdas.
- This change enables `TagHelper`s and other async code to exist inside of `HelperResult` blocks.
- Added test to validate Templates (they generate `HelperResult`s) can utilize `TagHelper`s correctly.
- Rename `RazorPage`s `RenderBodyDelegate` to `RenderBodyDelegateAsync`.
aspnet/Razor#494
- Use compilation options from the Compilation itself
- Get the parse options from the first syntax tree
- Get the build time IAssemblyLoadContext directly
- Now allow the attribute to exist on `img` and `source` tags.
- Updated existing `UrlResolutionTagHelper` functional test to validate `srcset` attribute.
#2964
- Razor rendering now understands `TagMode` which allows void elements to be rendered.
- Added a `TagStructure.WithoutEnd` bit to `InputTagHelper`, `ImageTagHelper` and `UrlResolutionTagHelper`. This will allow users to write the various elements in the void format. Used the HTML5 spec to determine the elements appropriate.
- Added tests to ensure `TagMode.StartTagOnly` is rendered properly.
- Updated a few functional tests to showcase the void element formats.
aspnet/Razor#450
Pranav K
Eilon Lipton
Ryan Nowak
Doug Bunting
Gerardo Melendrez
N. Taylor Mullen
Hao Kung
Kirthi Krishnamraju
Ben Adams
Chris R
David Fowler