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vb.net cookie操作

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<%@ Page Language="VB" %>

<script language="VB" runat="server">
    Const COOKIE_NAME  As String = "test-cookie-name"
    Const COOKIE_VALUE As String = "test-cookie-value"

    ' Declare our cookie object
    Dim objCookieObject As HttpCookie
    
    Sub btnSetCookie_OnClick(Sender As Object, E As EventArgs)
        ' Create a cookie object - I'm passing name and value,
        ' but you can also pass in a name and set the value later.
        ' ie. objCookieObject = New HttpCookie(COOKIE_NAME)
        objCookieObject = New HttpCookie(COOKIE_NAME, COOKIE_VALUE)

        ' We already set these above!
        'objCookieObject.Name   = COOKIE_NAME
        'objCookieObject.Value  = COOKIE_VALUE

        ' Additional cookie properties:
        objCookieObject.Expires = New DateTime(2010, 11, 12)

        ' Normally you can leave these alone.
        ' The defaults will work fine for most uses.
        'objCookieObject.Domain  = "www.domain.com"
        'objCookieObject.Path    = "/path/"
        'objCookieObject.Secure  = True
        
        Response.AppendCookie(objCookieObject)
    End Sub

    Sub btnRemoveCookie_OnClick(Sender As Object, E As EventArgs)
        objCookieObject = New HttpCookie(COOKIE_NAME)
        
        ' Expire it on the day I was born just so we're sure it's a date in the past.
        objCookieObject.Expires = New DateTime(1974, 11, 12)
        
        Response.AppendCookie(objCookieObject)
    End Sub

    Sub btnGetCookie_OnClick(Sender As Object, E As EventArgs)
        objCookieObject = Request.Cookies(COOKIE_NAME)

        ' In Beta 1 this worked fine... not with Beta 2.
        'If Not(objCookieObject = Nothing) Then
        
        If Not(objCookieObject Is Nothing) Then
            lblCookieDetails.Text        = objCookieObject.Name

            lblCookieDetailsName.Text    = objCookieObject.Name
            lblCookieDetailsValue.Text   = objCookieObject.Value
            
            ' For some reason I'm having trouble with this now...
            ' The setting seems to work, but I can't read it back.
            ' Anyone have any ideas? Email me -> john@asp101.com
            lblCookieDetailsExpires.Text = objCookieObject.Expires.ToString
            
            lblCookieDetailsDomain.Text  = objCookieObject.Domain
            lblCookieDetailsPath.Text    = objCookieObject.Path
            lblCookieDetailsSecure.Text  = objCookieObject.Secure.ToString
            lblCookieDetailsHasKeys.Text = objCookieObject.HasKeys.ToString
        Else
            lblCookieDetails.Text        = "Cookie Not Set!"

            lblCookieDetailsName.Text    = ""
            lblCookieDetailsValue.Text   = ""
            lblCookieDetailsExpires.Text = ""
            lblCookieDetailsDomain.Text  = ""
            lblCookieDetailsPath.Text    = ""
            lblCookieDetailsSecure.Text  = ""
            lblCookieDetailsHasKeys.Text = ""
        End If

        ' I'm ignoring collections.  They're outside the realm of this basic sample.
        ' FYI: Additional properties related to cookie collections: Values, Item
    End Sub
</script>

<html>
<body>

<h4>The cookie name we're using for this sample is: <em><%= COOKIE_NAME %></em></h4>

<form action="cookie.aspx" method="post" runat="server">
    <asp:Button type="submit" id="btnSetCookie" text="Set Cookie" OnClick="btnSetCookie_OnClick" runat="server" />
    <asp:Button type="submit" id="btnRemoveCookie" text="Remove Cookie" OnClick="btnRemoveCookie_OnClick" runat="server" />

    <p>
    To see the cookie's current status you'll need to click below.  This is because the response which adds or deletes the cookie happens after the request is already done.  As such, those changes aren't available from the request collection until the next request.
    </p>

    <asp:Button type="submit" id="btnGetCookie" text="Get Cookie Details" OnClick="btnGetCookie_OnClick" runat="server" />
</form>

<p>
<strong>Details of:</strong> <asp:label id="lblCookieDetails" runat="server" />
</p>

<table border="1">
    <thead>
        <tr>
            <th>Property</th>
            <th>Value</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>Name</td>
            <td><asp:label id="lblCookieDetailsName" runat="server" /></td>
        </tr>
        <tr>
            <td>Value</td>
            <td><asp:label id="lblCookieDetailsValue" runat="server" /></td>
        </tr>
        <tr>
            <td>Expires</td>
            <td><asp:label id="lblCookieDetailsExpires" runat="server" /></td>
        </tr>
        <tr>
            <td>Domain</td>
            <td><asp:label id="lblCookieDetailsDomain" runat="server" /></td>
        </tr>
        <tr>
            <td>Path</td>
            <td><asp:label id="lblCookieDetailsPath" runat="server" /></td>
        </tr>
        <tr>
            <td>Secure</td>
            <td><asp:label id="lblCookieDetailsSecure" runat="server" /></td>
        </tr>
        <tr>
            <td>Has Keys</td>
            <td><asp:label id="lblCookieDetailsHasKeys" runat="server" /></td>
        </tr>
    </tbody>
</table>

</body>
</html>

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