线程内查询

发布于 2024-10-20 18:05:14 字数 2082 浏览 3 评论 0原文

我有 3 个组合框,它们在页面加载时加载了来自 LINQ 查询的数据。问题在于查询包含太多数据,导致 Internet Explorer 停止响应一分钟多一点。

由于有 3 个查询,我的想法是将它们放入 3 个不同的线程中,但问题是最后我得到的唯一结果是错误:“DataSource 和 DataSourceID 均在‘cbOrganizator’上定义。删除一个定义。”

cbOrganizator 是一个组合框。

这是代码:

protected void Page_Load(object sender, EventArgs e)
{
    Bind();
}

public void Osobe()
    {
        PravosudnaAkademijaEntities db = new PravosudnaAkademijaEntities();

        var osoba = from o in db.osobas
                    orderby o.osoba_prezime
                    select new { o.osoba_id, imePrezime = o.osoba_prezime + " " + o.osoba_ime + " | " + o.tijelo.tijelo_naziv + " | " + o.radno_mjesto.rm_naziv_m };

        cbPolaznik.DataSource = osoba;
        cbPolaznik.DataTextField = "imePrezime";
        cbPolaznik.DataValueField = "osoba_id";
        cbPolaznik.DataBind();
        cbPolaznik.Items.Insert(0, " ");

        cbPredavac.DataSource = osoba;
        cbPredavac.DataTextField = "imePrezime";
        cbPredavac.DataValueField = "osoba_id";
        cbPredavac.DataBind();
        cbPredavac.Items.Insert(0, " ");

        cbAOM.DataSource = osoba;
        cbAOM.DataTextField = "imePrezime";
        cbAOM.DataValueField = "osoba_id";
        cbAOM.DataBind();
        cbAOM.Items.Insert(0, " ");
    }

    public void Tijela()
    {
        PravosudnaAkademijaEntities db = new PravosudnaAkademijaEntities();

        var tijelo = from t in db.tijeloes
                     orderby t.tijelo_naziv
                     select new { t.tijelo_id, sve = t.tijelo_naziv + " | " + t.mjesto.zupanija_drzava.zupanija_naziv };

        cbOrganizator.DataSource = tijelo;
        cbOrganizator.DataTextField = "sve";
        cbOrganizator.DataValueField = "tijelo_id";
        cbOrganizator.DataBind();
        cbOrganizator.Items.Insert(0, " ");
    }

    public void Bind()
    {
         Thread tOsobe = new Thread(Osobe);
         tOsobe.Start();
         Thread tTijela = new Thread(Tijela);
         tTijela.Start();
    }

我不知道出了什么问题,因此我们将不胜感激。主要想法是将查询分离到线程中,因此如果我的方法错误,请告诉我。

I have 3 comboboxes that are loaded with data from LINQ queries on page load. The problem is that queries contain so much data that it causes Internet Explorer to stop responding for a bit more than a minute.

As there are 3 queries my idea is to put them in 3 different threads, but the problem is at the end the only thing I get is the error saying: "Both DataSource and DataSourceID are defined on 'cbOrganizator'. Remove one definition."

cbOrganizator is a combobox.

Here is the code:

protected void Page_Load(object sender, EventArgs e)
{
    Bind();
}

public void Osobe()
    {
        PravosudnaAkademijaEntities db = new PravosudnaAkademijaEntities();

        var osoba = from o in db.osobas
                    orderby o.osoba_prezime
                    select new { o.osoba_id, imePrezime = o.osoba_prezime + " " + o.osoba_ime + " | " + o.tijelo.tijelo_naziv + " | " + o.radno_mjesto.rm_naziv_m };

        cbPolaznik.DataSource = osoba;
        cbPolaznik.DataTextField = "imePrezime";
        cbPolaznik.DataValueField = "osoba_id";
        cbPolaznik.DataBind();
        cbPolaznik.Items.Insert(0, " ");

        cbPredavac.DataSource = osoba;
        cbPredavac.DataTextField = "imePrezime";
        cbPredavac.DataValueField = "osoba_id";
        cbPredavac.DataBind();
        cbPredavac.Items.Insert(0, " ");

        cbAOM.DataSource = osoba;
        cbAOM.DataTextField = "imePrezime";
        cbAOM.DataValueField = "osoba_id";
        cbAOM.DataBind();
        cbAOM.Items.Insert(0, " ");
    }

    public void Tijela()
    {
        PravosudnaAkademijaEntities db = new PravosudnaAkademijaEntities();

        var tijelo = from t in db.tijeloes
                     orderby t.tijelo_naziv
                     select new { t.tijelo_id, sve = t.tijelo_naziv + " | " + t.mjesto.zupanija_drzava.zupanija_naziv };

        cbOrganizator.DataSource = tijelo;
        cbOrganizator.DataTextField = "sve";
        cbOrganizator.DataValueField = "tijelo_id";
        cbOrganizator.DataBind();
        cbOrganizator.Items.Insert(0, " ");
    }

    public void Bind()
    {
         Thread tOsobe = new Thread(Osobe);
         tOsobe.Start();
         Thread tTijela = new Thread(Tijela);
         tTijela.Start();
    }

I don't know what's wrong so any help would be appreciated. The primary idea is to separate queries into threads so if my approach is wrong please let me know.

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评论(2

方觉久 2024-10-27 18:05:14

您正在启动线程,但在页面加载之前没有给它们完成的机会。我不知道这如何导致您的特定错误,但如果您的页面在线程完成之前加载,那么您肯定不会得到结果。

我真的不知道如果没有 AJAX,您将如何完成您想要做的事情。

You're starting threads but not giving them a chance to finish before the page is loaded. I don't know how that results in your particular error, but if your page loads before the thread is completed, then you definitely won't get results.

I really don't see how you'll be able to accomplish what you're trying to do without AJAX.

胡大本事 2024-10-27 18:05:14

如果您确实想使用线程来执行此操作,我建议在线程池上执行查询。您可以抽象您的方法,以便在线程池方法的委托中调用它
所以我会用 Osobe 的更改签名替换绑定

ThreadPool.QueueUserWorkItem(new WaitCallback(Osobe));
ThreadPool.QueueUserWorkItem(new WaitCallback(Tijela));

,并用 Tijela 接受对象
例如,public void Osobe(object a )

您还需要跨线程编组调用,因为我不确定如果绑定发生在另一个线程上,网络表单是否会接受。

说了这么多,还是觉得ajax方法是最好的方法。

if you do really want to do it with threads i would suggest performing the query on the threadpool. you can abstract your method so that it is called in delegate of the threadpool method
so i would replace bind with

ThreadPool.QueueUserWorkItem(new WaitCallback(Osobe));
ThreadPool.QueueUserWorkItem(new WaitCallback(Tijela));

change signature of Osobe, and Tijela to acccept a Object
eg.public void Osobe(object a )

you will also need to marshal the call across the thread as i am not sure if webforms will accept if the binding is happening on another thread.

All said and done is still feel the ajax method is the best way forward.

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