C# 获取 oracle 存储过程输出参数值

public bool QueueToRegister(string appointsId, string enrolDoctor)
      {
          using (OleDbConnection conn = new OleDbConnection(DBHelper.Instance.ConnectionStr))
          {
              conn.Open();
              OleDbCommand cmd = conn.CreateCommand();
              try
              {
                  //插入号源属性
                  cmd.CommandType = CommandType.StoredProcedure;
                  cmd.CommandText = "PROC_APPOINTTOENROL";
                  cmd.Parameters.Add("@p_APPOINTSID", OleDbType.VarChar).Value = appointsId;
                  cmd.Parameters.Add("@p_ENROLDOCTOR", OleDbType.VarChar).Value = enrolDoctor;
                  cmd.Parameters.Add("@p_IsUseCallCode", OleDbType.VarChar).Value = PubVariable.Instance.IsUseCallCode;
                  cmd.Parameters.Add("@p_AreaName", OleDbType.VarChar).Value = PubVariable.Instance.AreaName;
                  cmd.Parameters.Add("@p_result", OleDbType.Integer).Value = -1;
                  cmd.Parameters["@p_result"].Direction = ParameterDirection.InputOutput;
 
                  if (cmd.ExecuteNonQuery() > 0)
                  {
                      var aa = cmd.Parameters["@p_result"].Value.ToString();
                      return true;
                  }
              }
              catch { return false; }
              finally
              {
                  if (conn.State != ConnectionState.Closed) conn.Close();
              }
          }
          return false;
      }

using (OleDbConnection conn = new OleDbConnection(str))
            {
                OleDbTransaction tran = null;
                conn.Open();
                OleDbCommand cmd = conn.CreateCommand();
                tran = conn.BeginTransaction(IsolationLevel.ReadCommitted);
                cmd.Transaction = tran;
                try
                {
                    //插入号源属性
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.CommandText = "PROC_APPOINTTOENROL";
                    cmd.Parameters.Add("@p_APPOINTSID", OleDbType.VarChar).Value = appointsId;
                    cmd.Parameters.Add("@p_ENROLDOCTOR", OleDbType.VarChar).Value = enrolDoctor;
                    cmd.Parameters.Add("@p_IsUseCallCode", OleDbType.VarChar).Value = isUseCallCode;
                    cmd.Parameters.Add("@p_AreaName", OleDbType.VarChar).Value = areaName;
                    cmd.Parameters.Add("@p_result", OleDbType.Integer).Value = -1;
                    cmd.Parameters["@p_result"].Direction = ParameterDirection.InputOutput;
                    
                    if (cmd.ExecuteNonQuery() > 0)
                    {
                        string result = cmd.Parameters["@p_result"].Value.ToString();
                        log.WriteLogs("QueueToRegister  return  p_result：", "返回结果：", result);
                        if (result.Trim() != "1") return false;
 
                        tran.Commit();
                        log.WriteLogs("执行QueueToRegister：", "执行成功", ofdepart);
                        return true;
                    }
                }
                catch (Exception ex)
                {
                    tran.Rollback();
                    log.WriteLogs("执行QueueToRegister：", "异常", ex.ToString());
                    return false;
                }
                finally
                {
                    if (conn.State != ConnectionState.Closed) conn.Close();
                }
            }