MudDataGrid: Filter for Nullable DateTime not working(#6521)

[ScarletKuro]

Description

Fixes #6521.

In the previous implementation, the code was checking for f.dataType == typeof(DateTime) in the razor file, which caused issues with filters not working correctly. The problem was that it did not account for nullable DateTime types.

To fix this, I added a new public property called FieldType to the FilterDefinition class, which checks for nullable types. The FieldType type already has all the necessary tests and works as expected. The updated code now uses f.FieldType.IsDateTime instead of f.dataType == typeof(DateTime). Additionally, I updated all the rest type checks to use FieldType instead.

I had to redo all the RenderFragments in MudDataGrid.razor due to compatibility issues with Visual Studio 2022. The file was not editable and caused a lot of problems, but everything is parsing smoothly now.

How Has This Been Tested?

Docs, reproduction snippet

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

Patch coverage: 85.41% and project coverage change: -0.94 ⚠️

Comparison is base (61fbff8) 91.41% compared to head (455d1b0) 90.47%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6607      +/-   ##
==========================================
- Coverage   91.41%   90.47%   -0.94%     
==========================================
  Files         398      398              
  Lines       14955    13487    -1468     
==========================================
- Hits        13671    12203    -1468     
  Misses       1284     1284              

Impacted Files	Coverage Δ
src/MudBlazor/Components/DataGrid/FieldType.cs	100.00% <ø> (ø)
...rc/MudBlazor/Components/DataGrid/MudDataGrid.razor	88.33% <84.44%> (-10.79%)	⬇️
src/MudBlazor/Components/DataGrid/Filter.cs	77.96% <100.00%> (-0.73%)	⬇️
.../MudBlazor/Components/DataGrid/FilterDefinition.cs	94.49% <100.00%> (+0.05%)	⬆️

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[henon]

I think there is a typo FiledType instead of FieldType

[ScarletKuro]

You are right. Ty for noticing, this would be a disaster 😭.

[henon]

I am sure this is gonna create a lot of conflicts though :(

[ScarletKuro]

The RenderFragments change - yes :( But it was really bad before.
From what I see it will affect only this PR #6212 Also this bug was before the 6.2.0 it's not clear if it's still exist.
all others that modified the MudDataGrid.razor are already affected by the PropertyExpression change.

[henon]

Thanks @ScarletKuro !

@tjscience FYI