Added TryGetValue<T> for Properties - fix #21343

[m4ss1m0g]

Summary of the changes

• Added on abstract class Microsoft.EntityFrameworkCore.ChangeTracking.PropertyValues the method public abstract bool TryGetValue<TValue>([NotNull] string propertyName, out TValue value);
• The method implementation on derived classes
  ° CurrentProertyValues
  ° ArrayPropertyValues
  ° OriginalPropertyValues
• Added unit test test/EFCore.Tests/ChangeTracking/Internal/PropertyValuesTest.cs

Fixes #21343

[ajcvickers]

Does this need to be re-implemented in subclass overrides? It looks like maybe the implementation can be common and in the base class?

[m4ss1m0g]

I haven't found a base, only abstract classes. I have implemented the method on concrete classes that implement the PropertyValues abstract class. This is my first PR on this project, maybe I missed something. Can you give me some clue ? Thanks.

[m4ss1m0g]

@ajcvickers I understand you prev message, sorry I implement the code in the PropertyValues class.

[ajcvickers]

@m4ss1m0g Looking better, but tests are failing. Take a look at Getting and building the code for how you can run all the tests locally.

[m4ss1m0g]

The line var property = EntityType.FindProperty(propertyName); raise the exception, I'm read properties through var property = Properties.FirstOrDefault(p=> p.Name == propertyName);

[ajcvickers]

@m4ss1m0g Thanks for the contribution!