Implemented shorthand syntax for ColumnDefinitions and RowDefinitions

[himgoyalmicro]

Implements #9802

Description

It will simplify the definition syntax of RowDefinitions and ColumnDefinitions by:

• Allowing rows and columns within a Grid to be defined by a collection that is delimited by comma and space
• Creating a Typeconvertor for ColumnDefinitionCollection and RowDefinitionCollection so they can process String as its input.

Decoupled RowDefinitionCollection and ColumnDefinitionCollection from the owner grid to ensure VS Hot Reload functionality remains intact.

Customer Impact

This feature will make Grid markup less verbose, allowing developers to create grids with simpler syntax.

Regression

N/A

Testing

Local build pass

Risk

Low

PS earlier this was being tracked by #10317 but using this PR now to make the commit history cleaner.

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull Request Overview

This PR implements a shorthand syntax for defining grid rows and columns by introducing type converters that allow string conversion to RowDefinitionCollection and ColumnDefinitionCollection, and updates grid properties accordingly.

• Added ColumnDefinitionCollectionConverter and RowDefinitionCollectionConverter classes.
• Modified Grid, RowDefinitionCollection, and ColumnDefinitionCollection to support owner management and simplified property setters.
• Adjusted API compatibility baselines to reflect the attribute changes.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
PresentationFramework.cs	Added converter stubs for collection type conversion.
WpfGeneratedKnownProperties.cs	Updated delegates and TypeConverterType assignments for grid properties.
RowDefinitionCollectionConverter.cs and ColumnDefinitionCollectionConverter.cs	Implemented string conversion for row/column definition collections.
RowDefinition.cs and ColumnDefinition.cs	Updated constructors and owner setters to decouple from the grid.
Grid.cs	Added setters for ColumnDefinitions/RowDefinitions and incorporated owner management.
PresentationFramework.csproj	Included new converter files.
ApiCompat Baseline	Reflects modifications in attributes on Grid properties.

Comments suppressed due to low confidence (1)

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Controls/Grid.cs:283

• [nitpick] The exception message uses inconsistent naming (using 'nameof(value)' here versus 'nameof(Grid)' elsewhere) in the owner assignment logic; standardize the parameter names for clarity.

throw new ArgumentException(SR.Format(SR.GridCollection_InOtherCollection, nameof(value), nameof(ColumnDefinitionCollection)));

[dipeshmsft]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 166 lines in your changes missing coverage. Please review.

Project coverage is 13.41294%. Comparing base (ba62855) to head (c031d5c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #10866         +/-   ##
===================================================
- Coverage   13.42191%   13.41294%   -0.00897%     
===================================================
  Files           3317        3319          +2     
  Lines         664749      664895        +146     
  Branches       74643       74675         +32     
===================================================
- Hits           89222       89182         -40     
- Misses        572982      573165        +183     
- Partials        2545        2548          +3     

Flag	Coverage Δ
Debug	13.41294% <0.00000%> (-0.00897%)	⬇️

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