# Module: Azaion.Common.Extensions.QueryableExtensions

## Purpose
Conditional LINQ `Where` extension for building dynamic query filters.

## Public Interface

| Method | Signature | Description |
|--------|-----------|-------------|
| `WhereIf<TSource>` | `static IQueryable<TSource> WhereIf<TSource>(this IQueryable<TSource> query, bool? condition, Expression<Func<TSource, bool>> truePredicate, Expression<Func<TSource, bool>>? falsePredicate = null)` | Applies `truePredicate` when condition is true, optional `falsePredicate` when false, no-op when null |

## Internal Logic
If `condition` is null, returns the query unmodified. If true, applies `truePredicate`. If false and `falsePredicate` is provided, applies it; otherwise returns unmodified query.

## Dependencies
- `System.Linq.Expressions` (BCL only)

## Consumers
- `UserService.GetUsers` — uses `WhereIf` for optional email and role search filters

## Data Models
None.

## Configuration
None.

## External Integrations
None.

## Security
None.

## Tests
None.