asp.net中的连接超时错误

Question

我遇到了一些问题，每次单击按钮时都会出现以下错误：

超时。在获得一个之前的超时时间 来自池的连接。这可能是因为所有汇集的 正在使用连接并且已达到最大池大小。

这一分钟下一分钟我遇到了一个错误。它抛出一个异常

public List<TransactionIssues> GetAllTransactions()
            {
                SqlConnection connection = new SqlConnection(connectionString);
                SqlCommand command = new SqlCommand();
                List<TransactionIssues> transIssues = new List<TransactionIssues>();
                command.CommandText = "issue_sp_getallunpostedissues";
                command.CommandType = CommandType.StoredProcedure;
                command.Connection = connection;
                SqlDataReader rdrObj;

                try
                {
                    connection.Open();
                    rdrObj = command.ExecuteReader();
                    while (rdrObj.Read())
                    {
                        TransactionIssues issues = new TransactionIssues();
                        issues.requisitionNumber = rdrObj.GetString(0);
                        issues.transactionDate = rdrObj.GetDateTime(1);
                        //issues.expense_acccount.account_desc = rdrObj.GetString(2);
                        //issues.expense_acccount.index = rdrObj.GetInt16(3);
                        issues.inventory_acccount.index = rdrObj.GetInt32(2);
                        issues.inventory_acccount.account_desc = rdrObj.GetString(3);
                        issues.docNumber = rdrObj.GetString(4);
                        issues.docType = rdrObj.GetString(5);
                        issues.items = getTransItemByRquisition(rdrObj.GetString(4));
                        transIssues.Add(issues);
                    }
                    rdrObj.Close();
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    connection.Close();
                }
                return transIssues;
            }

Answer 1

您应该处理 SqlConnection 以防止内存泄漏和未关闭的连接。 “using”关键字负责调用“finally”，从而关闭您的连接：

public List<TransactionIssues> GetAllTransactions()
        {
            using(var connection = new SqlConnection(connectionString))
            {
                using(var command = new SqlCommand())
                {
                    List<TransactionIssues> transIssues = new List<TransactionIssues>();
                    command.CommandText = "issue_sp_getallunpostedissues";
                    command.CommandType = CommandType.StoredProcedure;
                    command.Connection = connection;

                        connection.Open();
                        using(SqlDataReader rdrObj = command.ExecuteReader())
                        {
                            while (rdrObj.Read())
                            {
                                TransactionIssues issues = new TransactionIssues();
                                issues.requisitionNumber = rdrObj.GetString(0);
                                issues.transactionDate = rdrObj.GetDateTime(1);
                                //issues.expense_acccount.account_desc = rdrObj.GetString(2);
                                //issues.expense_acccount.index = rdrObj.GetInt16(3);
                                issues.inventory_acccount.index = rdrObj.GetInt32(2);
                                issues.inventory_acccount.account_desc = rdrObj.GetString(3);
                                issues.docNumber = rdrObj.GetString(4);
                                issues.docType = rdrObj.GetString(5);
                                issues.items = getTransItemByRquisition(rdrObj.GetString(4));
                                transIssues.Add(issues);
                            }
                        }
                        rdrObj.Close();

                    return transIssues;
                }
            }
        }