检测浏览器刷新

发布于 2024-11-19 03:03:31 字数 671 浏览 9 评论 0原文

我如何知道用户是否按 F5 刷新我的页面（类似于 SO 的实现方式。如果刷新页面，问题计数器不会增加）。我已经测试了许多教程中提到的许多代码片段，但没有一个能正常工作。

更清楚地说，假设我有一个空的 Web 表单，并且想要检测用户是否在客户端按了 F5（导致刷新未提交）。

我可以使用会话变量，但如果用户导航到我网站的另一个页面，然后返回，我想将其视为新访问，而不是刷新。所以这不是会话范围变量。

谢谢。

更新：我能找到的唯一解决方法是从基页继承我的页面，重写加载方法，如下所示：

    public class PageBase : System.Web.UI.Page
{
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        this.Session["LastViewedPage"] = Request.RawUrl;
    }
}

以及在每个页面中，如果我有兴趣知道这是否是刷新：

if (this.Session["LastViewedPage"].ToString() == Request.RawUrl)
{
    // This is a refresh!
}

原文

How can I find out if the user pressed F5 to refresh my page (Something like how SO implemented. If you refresh your page, the question counter is not increased). I have tested many code snippets mentioned in a dozen of tutorials, but none worked correctly.

To be more clear, suppose that i have an empty web form and would like to detect whether the user has pressed F5 in client-side (causing a refresh not submit) or not.

I can use session variables, but if the user navigates to another page of my site, and then comes back , I'd like to consider it as a new visit, not a refresh. so this is not a session-scope variable.

Thanks.

Update: The only workaround I could find was to inherit my pages from a base page, override the load method like below:

    public class PageBase : System.Web.UI.Page
{
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        this.Session["LastViewedPage"] = Request.RawUrl;
    }
}

and in every page if I was interested to know if this is a refresh:

if (this.Session["LastViewedPage"].ToString() == Request.RawUrl)
{
    // This is a refresh!
}

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素年丶 2024-11-26 03:03:31

我遇到了这个问题并使用以下代码。这对我来说效果很好。

bool isPageRefreshed = false;

protected void Page_Load(object sender, EventArgs args)
{
    if (!IsPostBack)
    {
        ViewState["ViewStateId"] = System.Guid.NewGuid().ToString();
        Session["SessionId"] = ViewState["ViewStateId"].ToString();
    }
    else
    {
        if (ViewState["ViewStateId"].ToString() != Session["SessionId"].ToString())
        {
            isPageRefreshed = true;
        }

        Session["SessionId"] = System.Guid.NewGuid().ToString();
        ViewState["ViewStateId"] = Session["SessionId"].ToString();
    } 
}

I run into this problem and use the following code. It works well for me.

bool isPageRefreshed = false;

protected void Page_Load(object sender, EventArgs args)
{
    if (!IsPostBack)
    {
        ViewState["ViewStateId"] = System.Guid.NewGuid().ToString();
        Session["SessionId"] = ViewState["ViewStateId"].ToString();
    }
    else
    {
        if (ViewState["ViewStateId"].ToString() != Session["SessionId"].ToString())
        {
            isPageRefreshed = true;
        }

        Session["SessionId"] = System.Guid.NewGuid().ToString();
        ViewState["ViewStateId"] = Session["SessionId"].ToString();
    } 
}

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