Unable to set my mapper class as the mapper that is used to insert an object into a table

[pol1612]

Unable to set my mapper class as the mapper that is used to insert an object into a table

[kpanpfizer]

Hi,
I think Default mapper must be generic to handle any type You try to use. So just don't register any if you do not need to change Dapper Extension default conventions.

Also You are registering your mapper in wrong extensions (DapperExtensions instead of DapperAsyncExtensions) thats why it is not beeing called.

This should work:

using (IDbConnection db = new SqlConnection(_configuration.GetConnectionString("DefaultConnection")))
        {
            DapperExtensions.**DapperAsyncExtensions**.SetMappingAssemblies
            (
                new[] { typeof(DeviceMapper).Assembly }
            );

            db.Open();
            
            Guid id = await db.InsertAsync<Device>(entity);
            
            return id;
        }

Also You can do it once at the start of application no need to do it every time (maybe that is clear to You and it was just example code).