"Can't write CLR type System.Byte[] with handler type NetTopologySuiteHandler"

Hello everyone,

I am using Npgsql and NetopologySuite plugin to work with Postgres db. Today I face an issue that Can't write CLR type System.Byte[] with handler type NetTopologySuiteHandler when save NetopologySuite.Geometries.MultiPoint into the database in geometry type column. I don’t know what is this problem? Here are my configurations followed official docs from MS

   protected override void OnModelCreating(ModelBuilder builder)
     {
         builder.HasPostgresExtension("postgis");
     }


     services.AddDbContext<CSContext>(option =>
      {
             option.UseNpgsql(Configuration.GetConnectionString("DefaultConnection"),
                 x => x.UseNetTopologySuite());
      });

[YohDeadfall]

You’re using NHibernate.Spatial which automatically converts an geometry to a byte array, but Npgsql expects a geometry object. This is because you call the UseNetTopologySuite method when configuring a DbContext, and this method registers the NTS plugin globally:

https://github.com/npgsql/Npgsql.EntityFrameworkCore.PostgreSQL/blob/10802aef53e3f61b9cc068986b52ccbfea630a84/src/EFCore.PG.NTS/Extensions/NpgsqlNetTopologySuiteDbContextOptionsBuilderExtensions.cs#L32-L33

So you need to use the RawPostgis plugin and do not register NTS in EF, or you need to teach NHibernate not to handle conversion automatically. Probably the last thing means that you shouldn’t use NHibernate.Spatial.

Closing the issue as there is no bug in Npgsql, but feel free to continue the discussion.

[YohDeadfall]

Thanks, will investigate as soon as possible.