public class Context : DbContext
{
    public Context()
        : base(new OracleConnection(ConfigurationManager.ConnectionStrings["OraAspNetConString"].ConnectionString), true)
    {
    }

    public DbSet<User> Users { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        foreach (var p in typeof(Context).GetProperties().Where(foo=>foo.PropertyType.IsGenericType))
        {
            // this is what we are trying to accomplish here --
            //modelBuilder.Entity<User>().ToTable("TBL_USERS", "TestSchema");

            Type tParam = p.PropertyType.GetGenericArguments()[0]; // typeof User
            MethodInfo generic = typeof(DbModelBuilder).GetMethod("Entity").MakeGenericMethod(new[] { tParam });
            object entityTypeConfig = generic.Invoke(modelBuilder, null);

            MethodInfo methodToTable = typeof(EntityTypeConfiguration<>).MakeGenericType(new[] { tParam }).GetMethod("ToTable", new Type[] { typeof(string), typeof(string) });
            methodToTable.Invoke(entityTypeConfig, new[] { GetMappedTableName(tParam), currentOraSchemaName });
        }

        base.OnModelCreating(modelBuilder);
    }

    private string currentOraSchemaName = ConfigurationManager.AppSettings.Get("OraSchemaName");

    private string GetMappedTableName(Type tParam)
    {
        TableAttribute tableAttribute = (TableAttribute)tParam.GetCustomAttributes(typeof(TableAttribute), false).FirstOrDefault();
        return tableAttribute.Name;
    }
}

[Table("TBL_USERS")]
public class User
{
    [Column("USER_ID")]
    public string UserId { get; set; }

    [Column("USER_NAME")]
    public string Name { get; set; }}