Npgsql.Tests.CommandTests.ParameterUnset C# (CSharp) Method

        public void ParameterUnset()
        {
            using (var conn = OpenConnection())
            {
                using (var cmd = new NpgsqlCommand("SELECT @p", conn))
                {
                    cmd.Parameters.Add(new NpgsqlParameter("@p", NpgsqlDbType.Integer));
                    Assert.That(() => cmd.ExecuteScalar(), Throws.Exception.TypeOf<InvalidCastException>());
                }
            }
        }