Basemap Projections
Click on the Expand Widget in the top right, select a Basemap, and the Spatial Reference is listed in the bottom left corner.
GeoBlazor
dymaptic
About this sample
This GeoBlazor sample, written in Blazor for .NET developers, demonstrates how basemaps in different spatial references reproject the entire view, using the BasemapGalleryWidget and PortalBasemapsSource components from the ArcGIS Maps SDK for JavaScript exposed through GeoBlazor's Razor component model. The page opens with a 2D map of the world centered roughly on North America. In the upper-right corner of the map an ExpandWidget shows a basemap icon; clicking it expands a Basemap Gallery panel populated from a curated ArcGIS Online portal group containing basemaps in a variety of projections. A small CustomOverlay in the lower-left corner displays the current MapView spatial reference WKID. Selecting any basemap from the gallery triggers the OnSpatialReferenceChanged event, the view reprojects, and the WKID readout updates live. The sample is intended to demonstrate how to swap basemaps and observe the resulting spatial-reference change reactively in a Blazor application without writing JavaScript.