[dev-v5][DataGrid] Add a SelectColumn Comparer property

[vnbaaij]

Port of #4344:

Pull Request

📖 Description

Added a SelectColumn comparer property, to allow the use of an IEqualityComparer<> for matching selected row items in scenarios such as Virtual mode rendering, providing a way to compare different item instances representing the same data.

👩‍💻 Reviewer Notes

A working samples can be seen in the following repository projects:

• AdventureWorks showing dynamic data loading using EntityFrameworkAsyncQueryExecutor in a Blazor Server app
• TripPin showing dynamic data loading using ODataAsyncQueryExecutor in a Blazor WebAssembly app

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component

[github-actions]

✅ All tests passed successfully

Details on your Workflow / Core Tests page.

[github-actions]

Summary - Unit Tests Code Coverage

Summary

Generated on:	11/22/2025 - 21:18:23
Coverage date:	11/22/2025 - 21:18:10
Parser:	Cobertura
Assemblies:	1
Classes:	197
Files:	269
Line coverage:	98.7% (6453 of 6535)
Covered lines:	6453
Uncovered lines:	82
Coverable lines:	6535
Total lines:	25702
Branch coverage:	92.1% (3642 of 3953)
Covered branches:	3642
Total branches:	3953
Method coverage:	Feature is only available for sponsors
Tag:	4628_19601336014

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