支持多返回值存储过程的SqlHelper

public readonly string connStr = ConfigurationManager.ConnectionStrings["sql"].ConnectionString;

        /// <summary>
        /// 执行非插叙语句，返回受影响行数
        /// </summary>
        /// <param name="cmdText">Sql语句</param>
        /// <param name="ps">参数列表</param>
        /// <returns>受影响行数</returns>
        public int ExecuteNonQuery(string cmdText, params SqlParameter[] ps)
        {
            return this.ExecuteNonQuery(cmdText, CommandType.Text, ps);
        }

        /// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="cmdText">存储过程名称</param>
        /// <param name="ps">参数列表</param>
        /// <returns>返回存储过程成功与否</returns>
        public int ExecuteNonQuerySP(string cmdText, params SqlParameter[] ps)
        {
            return this.ExecuteNonQuery(cmdText, CommandType.StoredProcedure, ps);
        }

        /// <summary>
        /// 执行SQL语句或存储过程，返回结果
        /// </summary>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="type">执行类型</param>
        /// <param name="ps">参数列表</param>
        /// <returns>返回受影响行数或存储过程成功与否</returns>
        public int ExecuteNonQuery(string cmdText, CommandType type, params SqlParameter[] ps)
        {
            if (type == CommandType.Text)
            {
                try
                {
                    using (SqlConnection conn = new SqlConnection(connStr))
                    {
                        using (SqlCommand cmd = new SqlCommand(cmdText, conn))
                        {
                            if (ps != null)
                            {
                                cmd.Parameters.AddRange(ps);
                            }
                            conn.Open();
                            return cmd.ExecuteNonQuery();
                        }
                    }
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
            else if (type == CommandType.StoredProcedure)
            {
                try
                {
                    ps[ps.Length - 1].Direction = ParameterDirection.Output;
                    using (SqlConnection conn = new SqlConnection(connStr))
                    {
                        using (SqlCommand cmd = new SqlCommand(cmdText, conn))
                        {
                            cmd.CommandType = CommandType.StoredProcedure;
                            if (ps != null)
                            {
                                cmd.Parameters.AddRange(ps);
                            }
                            conn.Open();
                            cmd.ExecuteNonQuery();
                        }
                    }
                    return (int)ps[ps.Length - 1].Value;
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
            else
            {
                return -1;
            }
        }

        /// <summary>
        /// 执行查询语句，返回第一行第一列数据
        /// </summary>
        /// <param name="cmdText">Sql语句</param>
        /// <param name="ps">参数列表</param>
        /// <returns>第一行第一列数据</returns>
        public object ExecuteScalar(string cmdText, params SqlParameter[] ps)
        {
            return ExecuteScalar(cmdText, CommandType.Text, ps);
        }

        /// <summary>
        /// 执行存储过程，返回存储过程返回值
        /// </summary>
        /// <param name="cmdText">存储过程名称</param>
        /// <param name="ps">参数列表</param>
        /// <returns>存储过程返回值</returns>
        public object ExecuteScalarSP(string cmdText, params SqlParameter[] ps)
        {
            return ExecuteScalar(cmdText, CommandType.StoredProcedure, ps);
        }

        /// <summary>
        /// 执行查询语句或存储过程，返回第一行第一列数据或存储过程返回值
        /// </summary>
        /// <param name="cmdText">Sql语句或存储过程名称</param>
        /// <param name="ps">参数列表</param>
        /// <returns>第一行第一列数据或存储过程返回值</returns>
        public object ExecuteScalar(string cmdText, CommandType type, params SqlParameter[] ps)
        {
            if (type == CommandType.Text)
            {
                try
                {
                    using (SqlConnection conn = new SqlConnection(connStr))
                    {
                        using (SqlCommand cmd = new SqlCommand(cmdText, conn))
                        {
                            if (ps != null)
                            {
                                cmd.Parameters.AddRange(ps);
                            }
                            conn.Open();
                            return cmd.ExecuteScalar();
                        }
                    }
                }
                catch (Exception ex)
                {
                    return ex;
                }
            }
            else if (type == CommandType.StoredProcedure)
            {
                try
                {
                    for (int i = 0; i < ps.Length; i++)
                    {
                        if (ps[i].Value == null)
                        {
                            ps[i].Direction = ParameterDirection.Output;
                        }
                    }
                    using (SqlConnection conn = new SqlConnection(connStr))
                    {
                        using (SqlCommand cmd = new SqlCommand(cmdText, conn))
                        {
                            cmd.CommandType = type;
                            if (ps != null)
                            {
                                cmd.Parameters.AddRange(ps);
                            }
                            conn.Open();
                            cmd.ExecuteScalar();
                        }
                    }
                    List<Object> returnValue = new List<object>();
                    for (int i = 0; i < ps.Length; i++)
                    {
                        if (ps[i].Direction == ParameterDirection.Output)
                        {
                            returnValue.Add(ps[i].Value);
                        }
                    }
                    return returnValue;
                }
                catch (Exception ex)
                {
                    return ex;
                }
            }
            else
            {
                return -1;
            }
        }

        /// <summary>
        /// 执行查询语句，并返回一个DataReader阅读器
        /// </summary>
        /// <param name="cmdText">Sql语句</param>
        /// <param name="ps">参数列表</param>
        /// <returns>DataReader阅读器</returns>
        public SqlDataReader ExecuteReader(string cmdText, params SqlParameter[] ps)
        {
            return ExecuteReader(cmdText, CommandType.Text, ps);
        }

        /// <summary>
        /// 执行存储过程，并返回一个DataReader阅读器
        /// </summary>
        /// <param name="cmdText">存储过程名称</param>
        /// <param name="ps">参数列表</param>
        /// <returns>DataReader阅读器</returns>
        public SqlDataReader ExecuteReaderSP(string cmdText, params SqlParameter[] ps)
        {
            return ExecuteReader(cmdText, CommandType.StoredProcedure, ps);
        }

        /// <summary>
        /// 执行查询语句或存储过程，并返回一个DataReader阅读器
        /// </summary>
        /// <param name="cmdText">Sql语句或存储过程名称</param>
        /// <param name="ps">参数列表</param>
        /// <returns>DataReader阅读器</returns>
        public SqlDataReader ExecuteReader(string cmdText, CommandType type, params SqlParameter[] ps)
        {
            SqlConnection conn = new SqlConnection(connStr);
            try
            {
                using (SqlCommand cmd = new SqlCommand(cmdText, conn))
                {
                    cmd.CommandType = type;
                    if (ps != null)
                    {
                        cmd.Parameters.AddRange(ps);
                    }
                    conn.Open();
                    return cmd.ExecuteReader(CommandBehavior.CloseConnection);
                }
            }
            catch (Exception ex)
            {
                conn.Dispose();
                throw (ex);
            }
        }

        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="cmdText">Sql语句</param>
        /// <param name="ps">参数列表</param>
        /// <returns>返回的DataSet</returns>
        public DataSet GetDataSet(string cmdText, params SqlParameter[] ps)
        {
            return this.GetDataSet(cmdText, CommandType.Text, ps);
        }

        /// <summary>
        /// 执行存储过程返回DataSet
        /// </summary>
        /// <param name="cmdText">存储过程名</param>
        /// <param name="ps">参数列表</param>
        /// <returns>返回DataSet</returns>
        public DataSet GetDataSetSP(string cmdText, params SqlParameter[] ps)
        {
            return this.GetDataSet(cmdText, CommandType.StoredProcedure, ps);
        }

        /// <summary>
        /// 执行存储过程，或SQL语句，返回DataSet
        /// </summary>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="type">执行类型</param>
        /// <param name="ps">参数列表</param>
        /// <returns>返回DataSet</returns>
        public DataSet GetDataSet(string cmdText, CommandType type, params SqlParameter[] ps)
        {
            DataSet ds = new DataSet();
            try
            {
                using (SqlDataAdapter sda = new SqlDataAdapter(cmdText, connStr))
                {
                    if (ps != null)
                    {
                        sda.SelectCommand.Parameters.AddRange(ps);
                    }
                    sda.SelectCommand.CommandType = CommandType.StoredProcedure;
                    sda.Fill(ds);
                }
                return ds;
            }
            catch (Exception ex)
            {
                ds.Dispose();
                throw (ex);
            }
        }