<%@ Page language="c#" AutoEventWireup="true"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>Check F5 refresh submit post back repeatly</title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<script language="C#" runat="server">
private bool _IsF5RefreshPostBack;
protected void Page_Load(object sender, EventArgs ea)
{
if (IsPostBack)
{
if (Request.Cookies["cookieTimeStamp"] != null)
{
//if (Request.Cookies["cookieTimeStamp"].Value != this.label1.Text)
//不用ViewState 使用 HiddenField 也可
if (Request.Cookies["cookieTimeStamp"].Value != (string) ViewState["vsTimeStamp"])
{
_IsF5RefreshPostBack = true;
}
}
}
string timeStamp = DateTime.Now.ToString();
//this.label1.Text = timeStamp;
ViewState["vsTimeStamp"] = timeStamp;
HttpCookie cookie = new HttpCookie("cookieTimeStamp", timeStamp);
Response.Cookies.Add(cookie);
if (_IsF5RefreshPostBack)
{
Response.Write("IsRefreshPostBack(F5) in Page Load<br>" );
}
}
void button1_Click (object sender, EventArgs ea)
{
if (_IsF5RefreshPostBack)
{
Response.Write("IsRefreshPostBack(F5) in Button Click<br>" );
}
}
</script>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<asp:Button ID="button1" Text="button1" onclick="button1_Click" runat="server" />
</form>
</body>
</HTML>
