ASP.NET Tutorial/Cookie/Delete
Содержание
Delete All Cookies
<source lang="csharp">
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">
void Page_Load()
{
string[] cookies = Request.Cookies.AllKeys;
foreach (string cookie in cookies)
{
BulletedList1.Items.Add("Deleting " + cookie);
Response.Cookies[cookie].Expires = DateTime.Now.AddDays(-1);
}
}
</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">
<title>Delete All Cookies</title>
</head> <body>
<form id="form1" runat="server">
Delete All Cookies
<asp:BulletedList
id="BulletedList1"
EnableViewState="false"
Runat="server" />
</form>
</body> </html></source>
Delete Cookie by setting the date of Expires
<source lang="csharp">
<%@ Page %> <script language="C#" runat="server"> private void Page_Init(object sender, EventArgs e) {
if((Request.Cookies["UserName"] != null) && (Request.Cookies["UserName"].Value != null)) UserNameLabel.Text = Request.Cookies["UserName"].Value.ToString();
} private void SaveButton_Click(object sender, System.EventArgs e) {
Response.Cookies["UserName"].Value = UserNameTextBox.Text; if(PersistCookieCheckBox.Checked) Response.Cookies["UserName"].Expires = System.DateTime.Now.AddDays(1); UserNameLabel.Text = UserNameTextBox.Text;
} private void DeleteButton_Click(object sender, System.EventArgs e) {
Response.Cookies["UserName"].Expires = System.DateTime.Now.AddDays(-1);
} </script> <html>
<body>
<form id="form1" method="post" runat="server">
Update UserName in Cookie:
<asp:TextBox id="UserNameTextBox" runat="server"></asp:TextBox>
<asp:Button id="SaveButton" runat="server" Text="Save" OnClick="SaveButton_Click"></asp:Button>
<asp:CheckBox id="PersistCookieCheckBox" runat="server" text="Persist Cookie?"></asp:CheckBox>
Current Cookie Contents:
<asp:Label ID="UserNameLabel" Runat="server" EnableViewState="False"></asp:Label>
<asp:Button id="RefreshButton" runat="server" Text="Refresh Without Saving"></asp:Button>
Deleting the cookie will take effect on the *next* postback, since the cookie information is still in Request.Cookies for the
duration of the PostBack once the Delete button is clicked. Click it once, then click the "Refresh Without Saving" button.
<asp:Button id="DeleteButton" runat="server" Text="Delete Cookie" OnClick="DeleteButton_Click"></asp:Button>
</form>
</body>
</html></source>
Deleting Cookies
<source lang="csharp">
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">
protected void btnDelete_Click(object sender, EventArgs e)
{
Response.Cookies[txtCookieName.Text].Expires = DateTime.Now.AddDays(-1);
}
</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">
<title>Delete Cookie</title>
</head> <body>
<form id="form1" runat="server">
<asp:Label
id="lblCookieName"
Text="Cookie Name:"
AssociatedControlID="txtCookieName"
Runat="server" />
<asp:TextBox
id="txtCookieName"
Runat="server" />
<asp:Button
id="btnDelete"
Text="Delete Cookie"
OnClick="btnDelete_Click"
Runat="server" />
</form>
</body> </html></source>
