对于请求的时间设置全局变量

问题描述

我可以设置一些单个请求的长度全局变量，让页面的所有控件可以在无需通过传递给他们每个人对此作出回应？

Can I set some kind of global variable for the length of a single Request, so that all the controls of the page can respond to it without having to pass it through to each of them?

例如，如果有人打我的母版保存按钮，可以设置我的东西让我的页面上的每个用户控件可以有一个像的Page_Load：

For instance, if someone hit a Save button on my MasterPage, could I set something so that each UserControl on my Page can have a Page_Load like:

protected void Page_Load(object sender, EventArgs e)
{
    if (isSaving) // isSaving is a global variable
    {
        saveData();  // save myself
    }
    loadData();
}

这似乎只是比有从母版的委托调用页面的保存功能，然后调用UC1.saveData（）为每个用户控件方便很多，虽然我知道这是更好的面向对象的思想。

It just seems a lot easier than having a delegate from the masterpage call the Page's save function, which then calls UC1.saveData() to each UserControl, though I know that's better Object Oriented thinking.

推荐答案

是的，你可以。看明显的地方：HttpContext的和 HttpContext.Current.Items 的集合，是始终在请求处理访问（见http://msdn.microsoft.com/en-us/library/system.web.httpcontext.items.aspx).

Yes, you can. Look at the obvious place: the HttpContext and the HttpContext.Current.Items collection that is always accessible during request handling (see http://msdn.microsoft.com/en-us/library/system.web.httpcontext.items.aspx).

正如一个的提示的：

public static class RequestScopedData
{
    private const string key = "key_that_you_choose";
    public static bool IsSaving
    {
        get
        {
            object o = HttpContext.Current.Items[key];
            return Convert.ToBoolean(o);
        }
        set
        {
            HttpContext.Current.Items[key] = value;
        }
    }
}

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