如何使用线程在asp.net？ [英] How to use threads in asp.net?

问题描述

我有Web窗体应用程序。在一个形式，我有几个功能。这被称为syncronously并需要一些时间。所以，我要叫他们在不同的线程。

I have web forms application. On one form I have a few functions. Which are called syncronously and takes some time. So I need to call them in different threads.

这是我在做什么的示例：

This is the sample of what I'm doing:

    protected void Page_Load(object sender, EventArgs e)
    {
        Thread t1 = new Thread(new ThreadStart(Function1));
        t1.Start();
        Thread t2 = new Thread(new ThreadStart(Function2));
        t2.Start();
    }

    private void Function1()
    {
        Thread.Sleep(5000);
        lbl1.Text = "Function1 completed";
    }

    private void Function2()
    {
        Thread.Sleep(5000);
        lbl2.Text = "Function2 completed";
    }

如果我调试（集breackpoints） lbl1.Text =FUNCTION1完成; 和 lbl2.Text =功能2完成; 获取调用，但文本没有改变最终的HTML页面上。

If I debug (set breackpoints) lbl1.Text = "Function1 completed"; and lbl2.Text = "Function2 completed"; is getting called, but there texts are not changing on final html page.

此外页面加载并不需要5秒。

Also Page load does not takes 5 sec.

P.S。我知道ASP网的作品不同，但我不知道我做错了。

p.s. I know asp net works different but I have no idea what I'm doing wrong.

推荐答案

没有正在等待你的线程来完成网页渲染，并返回之前 - 这有什么不对。

Nothing is waiting for your threads to complete before the page is rendered and returned - that's what's wrong.

要你的的Page_Load（）函数的结束（或在页面渲染生命周期中的最新的，可能的点），地址：

To the end of your Page_Load() function (or at the latest-possible point in the page rendering lifecycle), add:

t1.Join();
t2.Join();

此外：你不应该更新线程PROC内LBL1和LBL2 - 你应该存储在变量的结果（S），反映在主渲染线程的计算值（即一旦加入返回）。

Additionally: you should not update lbl1 and lbl2 within the thread proc - you should store the result(s) in variables and reflect the calculated values in the main rendering thread (i.e. once Join has returned).

编辑：虽然这修复了这个问题的问题，看看 PageAsyncTask 所推荐的瓦诺的回答。

Although this fixes the problem in the question, have a look at PageAsyncTask as recommended by Vano's answer.

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