npgsql,ef6,nts:EntityType“point”未定义键

我正在为.NET Framework 4.7编写一个简单的导入工具,用于读取MS Access文件并将其保存到PostGIS数据库中。

我现在很难让EF6 Point 对象是NetTopology类,而不是另一个表。

当我从Postgis数据库中读取写入数据时,会得到以下错误:

System.Data.Entity.ModelConfiguration.ModelValidationException
  HResult=0x80131500
  Message=One or more validation errors were detected during model generation:

Importer.Point: : EntityType 'Point' has no key defined. Define the key for this EntityType.
Points: EntityType: EntitySet 'Points' is based on type 'Point' that has no keys defined.

下面是一些代码:

    public static void Main(string[] args)
    {
        // Place this at the beginning of your program to use NetTopologySuite everywhere (recommended)
        NpgsqlConnection.GlobalTypeMapper.UseNetTopologySuite();

        using (var context = new PostGisContext())
        {
            var newKey = context.MyLocations.Count();
        }
    }

context.MyLocations.Count() 正在引发错误。

public class PostGisContext : DbContext
{
    public DbSet<MyLocation> MyLocations { get; set; }

    public PostGisContext() : base("name=PostgreSql")
    {        }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        // PostgreSQL uses the data schema by default - not dbo.
        modelBuilder.HasDefaultSchema("data");

        // Don't use plural table names:
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

        // Change CamelCase to lower-case:
        modelBuilder.Types().Configure(c => c.ToTable(LowerCaseTableName(c.ClrType)));

        modelBuilder.Conventions.Add(new LowerCaseConvention());

        base.OnModelCreating(modelBuilder);
    }

    private static string LowerCaseTableName(Type type)
    {
        var result = Regex.Replace(type.Name, ".[A-Z]", m => m.Value[0] + "_" + m.Value[1]);

        return result.ToLower();
    }
}

// A custom convention.
internal class LowerCaseConvention : IStoreModelConvention<EdmProperty>
{
    public void Apply(EdmProperty property, DbModel model)
    {
        property.Name = Regex.Replace(property.Name, ".[A-Z]", m => m.Value[0] + "_" + m.Value[1]).ToLower();
    }
}

当改变 Location 列到字符串上面的代码工作正常。

public class MyLocation
{
    [Key] 
    public int Id { get; set; }
    public string LocationId { get; set; }
    public NetTopologySuite.Geometries.Point Location { get; set; }
} 

public class NpgSqlConfiguration : DbConfiguration
{
    public NpgSqlConfiguration()
    {
        const string name = "Npgsql";

        SetProviderFactory(providerInvariantName: name, 
            providerFactory: NpgsqlFactory.Instance);

        SetProviderServices(providerInvariantName: name, 
            provider: NpgsqlServices.Instance);

        SetDefaultConnectionFactory(connectionFactory: new NpgsqlConnectionFactory());
    }
}

我肯定忘了一个场景或什么,但我找不到。 任何帮助都将不胜感激。