如何在 HttpModule 中利用或模仿应用程序 OnStart？

发布于 2024-08-28 01:32:56 字数 697 浏览 8 评论 0原文

我们正在尝试从许多 Web 应用程序中删除 global.asax，转而使用公共代码库中的 HttpModule。这对于许多应用程序事件（例如 BeginRequest 和 PostAuthentication）非常有效，但 HttpModule 中没有公开应用程序启动事件。

我可以想出一些臭方法来克服这种缺陷。例如，我可能可以这样做：

protected virtual void BeginRequest(object sender, EventArgs e)
{
    Log.Debug("Entered BeginRequest...");
    var app = HttpContext.Current.Application;
    var hasBeenSet app["HasBeenExecuted"] == null ? false : true;

    if(!hasBeenSet)
    {
        app.Lock();
        // ... do app level code

        app.Add("HasBeenExecuted", true);
        app.Unlock();
    }

    // do regular begin request stuff ...
}

但这对我来说不太好闻。

在没有 global.asax 的情况下调用某些应用程序开始逻辑的最佳方法是什么？

原文

We are trying to remove the global.asax from our many web applications in favor of HttpModules that are in a common code base. This works really well for many application events such as BeginRequest and PostAuthentication, but there is no Application Start event exposed in the HttpModule.

I can think of a couple of smelly ways to overcome this deficit. For example, I can probably do this:

protected virtual void BeginRequest(object sender, EventArgs e)
{
    Log.Debug("Entered BeginRequest...");
    var app = HttpContext.Current.Application;
    var hasBeenSet app["HasBeenExecuted"] == null ? false : true;

    if(!hasBeenSet)
    {
        app.Lock();
        // ... do app level code

        app.Add("HasBeenExecuted", true);
        app.Unlock();
    }

    // do regular begin request stuff ...
}

But this just doesn't smell well to me.

What is the best way to invoke some application begin logic without having a global.asax?

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爱人如己 2024-09-04 01:32:56

只需在 HttpModule 中保留一个静态布尔值：

private static bool _hasApplicationStarted = false;
private static object _locker = new object();

private void EnsureStarted()
{
    if (_hasApplicationStarted) return;

    lock (_locker)
    {
        if (_hasApplicationStarted) return;

        // perform application startup here

        _hasApplicationStarted = true;
    }
}

然后，任何需要应用程序启动的方法只需调用 EnsureStarted 即可。

Just keep a static bool in the HttpModule:

private static bool _hasApplicationStarted = false;
private static object _locker = new object();

private void EnsureStarted()
{
    if (_hasApplicationStarted) return;

    lock (_locker)
    {
        if (_hasApplicationStarted) return;

        // perform application startup here

        _hasApplicationStarted = true;
    }
}

Then have any method that needs the application to have started just call EnsureStarted.

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