线程出现 异常~

Question

    protected string ApiXmlPath;
    protected string CustomerName;    protected void Page_Load(object sender, EventArgs e)
    {
       ApiXmlPath = "http://open.client.api.com/list/api/";//xml文档型的Url
       CustomerName = "123456";
       if (!IsPostBack)
          CreateXmlCustomerSelf();
    }    public void CreateXmlCustomerSelf()
    {
        string XFileName = CustomerName + ".xml";
        FileInfo file = new FileInfo(HttpContext.Current.Server.MapPath("~/custom/XmlCache/" + XFileName));
        if (file.Exists)
            file.Delete();
        XmlTextWriter xtr = new XmlTextWriter(HttpContext.Current.Server.MapPath("~/custom/XmlCache/" + XFileName), Encoding.Default);
        xtr.Close();
        System.Threading.Thread ct = new System.Threading.Thread(new System.Threading.ThreadStart(XmlSaveLocation));
        ct.Start();
        // XmlSaveLocation();
    }    private void XmlSaveLocation()
    {
        XmlDocument x = new XmlDocument();
        x.Load(ApiXmlPath);
        x.Save(HttpContext.Current.Server.MapPath("~/custom/XmlCache/" + CustomerName + ".xml");//异常位置   未将对象引用设置到对象的实例。
    }
        //System.Threading.Thread ct = new System.Threading.Thread(new System.Threading.ThreadStart(XmlSaveLocation));
        //ct.Start();
        XmlSaveLocation();不用线程的时候 没有任何做错  程序也完成了！一是用线程 就出现 未将对象引用设置到对象的实例。的异常报错~由于 Xml文档的Url 加载到本地 比较慢~ 所以想用 线程处理一下~大侠们 帮忙看看  到底是什么问题？  为什么是用线程 就会出异常分不多~  多谢各位了

Answer 1

x.Save(HttpContext.Current.Server.MapPath("~/custom/XmlCache/" + CustomerName + ".xml");  用线程 这里就会出现异常~

Answer 2

第一次接触 线程问题~ Up Up

Answer 3

HttpContext.Current.Server不存在吧...

Answer 4

protected string ApiXmlPath;
    protected string CustomerName;设置为静态的试试或者别在aspx页面里新开线程

Answer 5

全局变量 设置成静态的 也不好使~或者别在aspx页面里新开线程 这个怎么弄？没看懂

Answer 6

   xtr.Close（）；
如果有dispose
请用
   xtr.dispose()
试试

Answer 7

解决了 谢谢你哈把    private void XmlSaveLocation()
    {
        XmlDocument x = new XmlDocument();
        x.Load(ApiXmlPath);
        x.Save(Server.MapPath("~/custom/XmlCache/" + CustomerName + ".xml"));
    }
改成
    object sysobj = new object();
    private void XmlSaveLocation()
    {
        lock (sysobj)
        {
            XmlDocument x = new XmlDocument();
            x.Load(ApiXmlPath);
            x.Save(Server.MapPath("~/custom/XmlCache/" + CustomerName + ".xml"));
        }
    }
就可以了~

Answer 8

解决了 谢谢你哈把    private void XmlSaveLocation()
    {
        XmlDocument x = new XmlDocument();
        x.Load(ApiXmlPath);
        x.Save(Server.MapPath("~/custom/XmlCache/" + CustomerName + ".xml"));
    }
改成
    object sysobj = new object();
    private void XmlSaveLocation()
    {
        lock (sysobj)
        {
            XmlDocument x = new XmlDocument();
            x.Load(ApiXmlPath);
            x.Save(Server.MapPath("~/custom/XmlCache/" + CustomerName + ".xml"));
        }
    }
就可以了~