OracleConnection.ClearAllPools - 由于对象的当前状态,操作无效

时间:2009-08-17 16:38:19

标签: c# asp.net oracleclient

我在ashx文件中有以下代码 - 不要问为什么; - )

<%@ WebHandler Language="C#" Class="Site.Pool" %>

using System;
using System.Data;
using System.IO;
using System.Web;
using System.Web.SessionState;

using Core.Database;
using Core.ITables;
using Online.Server.Busi;
using Online.Server.ITables;
using XactNet.Busi;

namespace Site
{
    public class Pool : IHttpHandler, IRequiresSessionState
    {
            public void ProcessRequest(HttpContext context)
            {
            try
            {
                Oracle.DataAccess.Client.OracleConnection.ClearAllPools();
                context.Response.Write("SUCCESS");
            }
            catch (Exception e)
            {
                context.Response.Write(e.ToString());
            }

        }

            public bool IsReusable
            {
                get { return false; }
        }
        }
}

调用时,会写出异常:

System.InvalidOperationException: Operation is not valid due to the current state of the object. 
at Oracle.DataAccess.Client.OracleConnection.ClearAllPools() 
at Site.Pool.ProcessRequest(HttpContext context)

在尝试清除连接池之前,有关连接池需要处于什么状态的任何建议?

谢谢,

1 个答案:

答案 0 :(得分:4)

这是InvalidOperationException的默认错误消息,所以不要假设它在这种情况下有任何重要意义......显然Oracle并不打算写一个明确的错误消息。

根据Reflector:

,这是ClearAllPools方法的代码
public static void ClearAllPools()
{
    if (!OracleInit.bSetDllDirectoryInvoked)
    {
        OracleInit.Initialize();
    }
    if (((ConnectionDispenser.m_ConnectionPools == null) || (ConnectionDispenser.m_ConnectionPools.Count == 0)) && ((ConnectionDispenser.m_htSvcToRLB == null) || (ConnectionDispenser.m_htSvcToRLB.Count == 0)))
    {
        throw new InvalidOperationException();
    }
    ConnectionDispenser.ClearAllPools();
}

所以显然当没有连接池时它抛出了这个异常,我看不到检查那个...所以最终唯一的选择是捕获异常