Question

我使用以下代码使用存储过程

获取客户详细信息

    public List<Customer> GetPacketReconciliation(int customerId, int size, DateTime billDate, ref DateTime lastRunDate)
    {
        List<Customer> getCustomer = new List<Customer>();

        SqlParameter[] arParms = new SqlParameter[4];
        arParms[0] = new SqlParameter("@Cust_ID", SqlDbType.Int);
        arParms[0].Value = customerId;

        arParms[1] = new SqlParameter("@Size", SqlDbType.Int);
        arParms[1].Value = size;

        arParms[2] = new SqlParameter("@Last_Run_Date", SqlDbType.DateTime);
        arParms[2].Direction = ParameterDirection.InputOutput;
        arParms[2].Value = lastRunDate;

        arParms[3] = new SqlParameter("@Bill_Date", SqlDbType.DateTime);
        arParms[3].Value = billDate;


        using (SqlConnection sqlCon = new SqlConnection(this.GetConnectionString()))
        {
            sqlCon.Open();

            using (SqlDataReader reader = SqlHelper.ExecuteReader(sqlCon, CommandType.StoredProcedure, "dbo.GetCustomer", arParms))
            {
                if (reader.HasRows)
                {

                    getCustomer= MapToEntityCollection<Customer>(reader);
                }
            }
        }

        if (arParms[2].Value != DBNull.Value)
        {
            lastRunDate = Convert.ToDateTime(arParms[2].Value);
        }

        return getCustomer;
    }

存储过程

 SET QUOTED_IDENTIFIER ON
 SET ANSI_NULLS ON
 GO
 CREATE  PROCEDURE [dbo].[GetCustomer] 
   @Cust_ID SMALLINT, 
   @Size INT,
   @Last_Run_Date DATETIME OUTPUT,
   @Bill_Date DATETIME
 AS
  BEGIN
  END

我在这里使用一个ref变量lastRunDate。调试时我可以看到lastdate中的sqlparameter值设置正确。但是当我使用sql profiler查看它时，我可以看到lastRunDate设置为null。我像arParms [2] .Value = DateTime.Parse（“2017-01-01”）硬编码，它的工作原理。参考参数的任何问题??

任何人在此代码中看到任何问题..

SqlParameter中的ref参数问题 - C＃

0 个答案: