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);