[DataGrid] Add IsFixed parameter by vnbaaij · Pull Request #3927 · microsoft/fluentui-blazor

vnbaaij · 2025-06-17T07:25:05Z

This PR adds an IsFixed parameter to the FluentDataGrid component that allows developers to optimize performance when working with static datasets that are not expected to change during the grid's lifetime. Fixes #3911. Fixes #3920.

Changes

New Parameter

Added IsFixed boolean parameter with default value false to maintain backward compatibility
When IsFixed=true, the grid optimizes refresh behavior for static datasets
When IsFixed=false (default), maintains existing behavior from v4.11.9

Performance Optimizations

When IsFixed=true:

Skips hash computation for Items collection change detection
Reduces automatic RefreshItems calls to only forced or initial requests
Maintains full functionality for pagination, explicit refreshes, and data source changes

Usage Example

<!-- Default behavior (existing functionality) -->
<FluentDataGrid Items="@dynamicData.AsQueryable()">
    <PropertyColumn Property="@(x => x.Name)" />
</FluentDataGrid>

<!-- Optimized for static datasets -->
<FluentDataGrid Items="@staticData.AsQueryable()" IsFixed="true">
    <PropertyColumn Property="@(x => x.Name)" />
</FluentDataGrid>

Implementation Details

Modified OnParametersSetAsync() to respect the IsFixed parameter in change detection logic
Enhanced RefreshDataCoreAsync() to be more conservative about automatic refreshes when IsFixed=true
Added comprehensive test coverage including edge cases and explicit refresh scenarios

Backward Compatibility

Default value of false ensures existing code continues to work unchanged
All existing functionality (pagination, sorting, explicit refreshes) remains fully functional
No breaking changes to existing APIs

This implementation replaces the automatic refresh logic that was added in v4.12.0 with more controlled behavior when developers know their dataset is static, providing significant performance benefits for such scenarios.

github-actions · 2025-06-17T07:31:29Z

✅ All tests passed successfully

Details on your Workflow / Core Tests page.

github-actions · 2025-06-17T07:31:38Z

Summary - Unit Tests Code Coverage

Summary


Generated on:	6/17/2025 - 7:36:33 AM
Coverage date:	6/17/2025 - 7:36:24 AM
Parser:	Cobertura
Assemblies:	1
Classes:	254
Files:	364
Line coverage:	60.5% (5986 of 9881)
Covered lines:	5986
Uncovered lines:	3895
Coverable lines:	9881
Total lines:	32709
Branch coverage:	52.7% (3007 of 5697)
Covered branches:	3007
Total branches:	5697
Method coverage:	Feature is only available for sponsors
Tag:	3788_15700997488

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Paxol · 2025-07-11T10:46:30Z

Hello, is there any ETA for when this PR will be merged into a public version of the NuGet package (even a prerelease)?
I’m currently experiencing an issue with version 4.12.0 and Blazor WASM when using the OData adapter. The ComputeItemsHash function is called with the Items parameter and attempts to enumerate the query synchronously.
I believe this pull request would resolve that problem.

vnbaaij · 2025-07-11T11:19:24Z

There are pre-release packages available already. See https://github.com/microsoft/fluentui-blazor/blob/dev/docs/using-latest-daily.md

v4.12.1 final will probably be available next week

Re-implement DataGrid IsFixed

8f881d9

vnbaaij added this to the v4.12.1 milestone Jun 17, 2025

vnbaaij requested a review from dvoituron as a code owner June 17, 2025 07:25

vnbaaij changed the title ~~Re-implement DataGrid IsFixed~~ [DataGrid] Add IsFixed parameter Jun 17, 2025

vnbaaij enabled auto-merge (squash) June 17, 2025 07:26

dvoituron approved these changes Jun 17, 2025

View reviewed changes

vnbaaij merged commit eb0b32a into dev Jun 17, 2025
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vnbaaij deleted the users/vnbaaij/datagrid-isfixed branch June 17, 2025 07:31

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[DataGrid] Add IsFixed parameter#3927

[DataGrid] Add IsFixed parameter#3927
vnbaaij merged 1 commit intodevfrom
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vnbaaij commented Jun 17, 2025

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vnbaaij commented Jun 17, 2025

Changes

New Parameter

Performance Optimizations

Usage Example

Implementation Details

Backward Compatibility

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Summary - Unit Tests Code Coverage

Coverage

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Paxol commented Jul 11, 2025

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vnbaaij commented Jul 11, 2025

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3 participants

github-actions bot commented Jun 17, 2025 •

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github-actions bot commented Jun 17, 2025 •

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