SQL Filter Query

This GeoBlazor sample, written in Blazor for .NET developers, demonstrates client-side filtering of a FeatureLayer through its DefinitionExpression from the ArcGIS Maps SDK for JavaScript exposed through GeoBlazor's FeatureLayer Razor component. The page shows a 2D night-themed streets basemap of the Santa Monica Mountains in Los Angeles County overlaid with a parcels FeatureLayer. In the upper-right corner of the map a CustomOverlay hosts a styled dropdown select. The dropdown's first option is the placeholder Choose a SQL where clause which maps to a no-results expression (1=0); the remaining options are five SQL where-clause snippets such as Roll_LandValue < 200000, TaxRateArea = 10853, Bedrooms5 > 0, UseType = 'Residential', and Roll_RealEstateExemp > 0. Selecting a clause binds it to the FeatureLayer's DefinitionExpression so only matching parcels are drawn on the map, and clicking any visible parcel opens a popup with its UseType, description, and land value. The sample is intended to demonstrate filtering a hosted FeatureLayer with a server-evaluated SQL expression in a Blazor application without writing JavaScript.