在 MongoDB C# Drvier 使用 GeoLocation

GeoLocation in MongoDb C# Driver

先記起來
https://stackoverflow.com/questions/6993249/mongodb-geospatial-index-in-c-sharp
https://stackoverflow.com/questions/17807577/how-to-create-indexes-in-mongodb-via-net
https://stackoverflow.com/questions/30829282/findall-in-mongodb-net-driver-2-0
https://stackoverflow.com/questions/33807787/mongo-db-near-query-in-c

var gp =new GeoJsonPoint<GeoJson2DGeographicCoordinates>(new GeoJson2DGeographicCoordinates(coordinates[0], coordinates[1]));
var query=Builders<BsonDocument>.Filter.Near("Geo",gp,radius);
var result = await col.Find(query).ToListAsync();