好用的SqlParamterList

 public class SqlParameterList : List<SqlParameter>
    {
        #region Properties

        /// <summary>
        /// Gets the parameter having the specified name
        /// </summary>
        /// <param name="parameterName">The name of the parameter
        /// to be returned</param>
        /// <returns>The specified parameter, or null if no
        /// parameter with the specified name exists in the list</returns>
        public SqlParameter this[string parameterName]
        {
            get
            {
                foreach (SqlParameter parm in this)
                {
                    if (parm.ParameterName == parameterName)
                        return parm;
                }
                return null;
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Creates a new SqlParameter instance and adds it to the list
        /// </summary>
        /// <param name="name">The name of the parameter</param>
        /// <param name="type">The data type of the parameter</param>
        /// <param name="size">The size of the parameter</param>
        /// <param name="value">The value of the parameter</param>
        /// <returns>The new SqlParameter instance</returns>
        public SqlParameter Add(
            string name,
            SqlDbType type,
            int size,
            object value
            )
        {
            SqlParameter parameter = Add(name, type, value);
            parameter.Size = size;
            return parameter;
        }

        /// <summary>
        /// Creates a new SqlParameter instance and adds it to the list
        /// </summary>
        /// <param name="name">The name of the parameter</param>
        /// <param name="type">The data type of the parameter</param>
        /// <param name="value">The value of the parameter</param>
        /// <returns>The new SqlParameter instance</returns>
        public SqlParameter Add(
            string name,
            SqlDbType type,
            object value
            )
        {
            SqlParameter parameter = new SqlParameter(name, type);
            parameter.Value = (value == null) ? DBNull.Value : value;
            Add(parameter);
            return parameter;
        }

        /// <summary>
        /// Creates a new SqlParameter instance and adds it to the list
        /// </summary>
        /// <param name="name">The name of the parameter</param>
        /// <param name="type">The data type of the parameter</param>
        /// <param name="value">The value of the parameter</param>
        /// <returns>The new SqlParameter instance</returns>
        public SqlParameter Add(
            string name,
            object value
            )
        {
            SqlParameter parameter = new SqlParameter(name, value);
            Add(parameter);
            return parameter;
        }

        /// <summary>
        /// Removes the parameter with the specified name from the list
        /// </summary>
        /// <param name="parameterName">The name of the parameter to be removed</param>
        /// <returns>True if an item was removed from the list, false if not</returns>
        public bool Remove(string parameterName)
        {
            SqlParameter parm = this[parameterName];
            if (parm == null)
                return false;

            this.Remove(parm);
            return true;
        }

        #endregion
    }

使用：

SqlParameterList parameters = new SqlParameterList();
parameters.Add("@testName", SqlDbType.VarChar, consultantNumber);