避免页面刷新上的按钮单击事件 [英] Avoid button click event on page refresh

问题描述

大家好，

我有一个网页，其中有一个按钮，并做了一些编码，当我刷新页面时，该按钮单击事件已触发，请让我知道如何避免在页面刷新时使用它.


谢谢你

Mohd Wasif

hi all ,

I have a web page in that i have a button and did some coding in that when i refresh page that button click event is firing please let me know how to avoid it on page refresh.


Thanking You

Mohd Wasif

推荐答案

这是最终的目的

http://www.codeproject.com/KB/aspnet/RefreshPage.aspx

OR

This is a final destinaion

http://www.codeproject.com/KB/aspnet/RefreshPage.aspx

OR

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack) // If page loads for first time
    {
        // Assign the Session["update"] with unique value
        Session["update"] = Server.UrlEncode(System.DateTime.Now.ToString()); 
        //=============== Page load code =========================




        //============== End of Page load code ===================
    }
}

protected void btnDisplay_Click(object sender, EventArgs e)
{ 
    // If page not Refreshed
    if (Session["update"].ToString() == ViewState["update"].ToString())
    {
        //=============== On click event code ========================= 

        lblDisplayAddedName.Text = txtName.Text;

        //=============== End of On click event code ==================

        // After the event/ method, again update the session 

        Session["update"] = Server.UrlEncode(System.DateTime.Now.ToString()); 
    }
    else // If Page Refreshed
    {
        // Do nothing 
    }
}

protected override void OnPreRender(EventArgs e)
{
    ViewState["update"] = Session["update"];
}

太好了……... !!

Great..........!

在您的Page_Load事件中添加以下代码，一切都很好.

Add the following code in your Page_Load event, and it will be all fine.

//browser refresh fires the last event (for ex button click) again 
//the following code prevents this action.
if (!IsPostBack)
{
    ViewState["postids"] = System.Guid.NewGuid().ToString();
    Session["postid"] = ViewState["postids"].ToString();
}
else
{
    if (ViewState["postids"].ToString() != Session["postid"].ToString())
    {
        IsPageRefresh = true;
    }
    Session["postid"] = System.Guid.NewGuid().ToString();
    ViewState["postids"] = Session["postid"].ToString();
}

尝试理解代码.让我知道你是否不明白.

PS:我从网络上的某个地方(现在不记得链接了)获取了此解决方案，并在我的一个项目中使用了它.

干杯！
Ankur

Try and understand the code. Let me know if you don''t get it.

PS: I took this solution from somewhere on the web (I don''t remember the link now) and used it in one of my projects.

Cheers!
Ankur

如发布/重定向/获取 [ ^ ]模式可以避免这种情况

如果这不适用于您的页面，则可能需要查看使用Session \ ViewState来处理此问题

例如会议

http://csharpdotnetfreak.blogspot.com/2008/12/detect- browser-refresh-to-avoid-events.html [ ^ ]

ASP.Net中的刷新页面问题 [

As metioned in this thread[^] you might consider using a Post/Redirect/Get[^] pattern to avoid this

If this isn''t applicable to your page, you might want to look at using either Session \ ViewState to handle this

e.g. Session

http://csharpdotnetfreak.blogspot.com/2008/12/detect-browser-refresh-to-avoid-events.html[^]

Refresh Page Issue in ASP.Net[^]

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