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Retrieving multiple settings from a cookie

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Julian Voelcker

I think that I am going mad here.

I have no problems setting a cookie value and then retrieving it.

I can also set multiple values to a cookie without any problems.

However I cannot get my head around retrieving multiple values from a
cookie.

Any chance of someone providing some sample code?

Also, with Classic ASP one could set the domain name for the cookie so
that it was only accessible from that domain - how can I set or disable
this using C#?

Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom

Reply to this message...

Brian W. Spolarich

| I think that I am going mad here.

Join the club. :-)
=20
| I have no problems setting a cookie value and then retrieving it.
|=20
| I can also set multiple values to a cookie without any problems.
|=20
| However I cannot get my head around retrieving multiple values from a=20
| cookie.
|=20
| Any chance of someone providing some sample code?

How about this?

        public void SetCookie()
        {
            HttpCookie myCookie =3D new HttpCookie("test");
            myCookie.Domain =3D "localhost";
            myCookie.Values.Add("foo","bar");
            myCookie.Values.Add("fred","wilma");
            myCookie.Values.Add("barney","betty");

            Response.Cookies.Add(myCookie);
        }

        public void GetCookie()
        {
            HttpCookie aCookie =3D Response.Cookies["test"];
            foreach (string s in aCookie.Values.Keys)
            {
                Response.Write("Key: " + s + " Value: " + aCookie.Values[s] + =
"<P>");
            }
        }

Some things to think about:

- Response.Cookies is of type HttpCookieCollection which implements =
the IEnumerable and IDictionary interfaces, which enables you to =
retrieve objects from the collection by index (e.g. Response.Cookies[1]) =
or by key name. This is all provided by the objects and interfaces =
defined in the System.Collections namespace.
- HttpCookie provides a number of properties which map to the various =
cookie attributes you're familiar with:
    - Domain
    - Expires
    - Name
    - Path

- HttpCookie has a property called Values, which is of type =
NameValueCollection, and contains pairs of names and values. As such =
you can iterate through its keys in the way I've identified above, or =
you can access them directly by name or index. e.g.:
    aCookie.Values[0];
    aCookie.Values["username"];

    and also, for convenience sake:

    aCookie["username"];

    The last one is true because in C# you can declare a particular =
property to be the indexer for a class.
=20
| Also, with Classic ASP one could set the domain name for the=20
| cookie so=20
| that it was only accessible from that domain - how can I set=20
| or disable=20
| this using C#?

Declare the HttpCookies object and use the 'Domain' property.

Regards,

-bws

Reply to this message...

Brian W. Spolarich

| -----Original Message-----
| From: Julian Voelcker [mailto:Click here to reveal e-mail address]
| Sent: Wednesday, July 24, 2002 12:59 PM
| To: Brian W. Spolarich
| Subject: Re: [aspngcs] Retrieving multiple settings from a cookie
|=20
|=20
| Thanks Brian, you are a star. I really must get my head around these=20
| collections. It just seemed to be so much easier with Classic ASP.

I'd argue that this is an example of "front-loading" of effort and =
complexity: its "harder" to do simple things, but its comparatively =
"easier" to do more complex things. =20

Classic ASP doesn't require a great deal of overhead to do simple =
things, but also doesn't provide a great deal of support when you want =
to do something more complex or involved. Thus you have to "roll your =
own" when you want to do something non-trivial.

The collections stuff sort of works like magic. Its almost always =
there when you want it to be. The trick for me now is to figure out =
when to use it in my own classes, and how to implement it properly.

I've found the learning curve associated with the .NET framework class =
library to be rather steep, and learning C#'s differences from Java =
increases the challenge. Add to that ASP.NET's page processing model, =
quite different from good-old CGI, and you've got a lot of stuff to =
learn, unlearn, and occasionally relearn.

However I think the benefits outweigh the drawbacks, as I believe =
developers can become very productive once they achieve a critical mass =
of knowledge and experience. I'm not sure I'm there yet myself, but I =
do enjoy helping others solve problems. Anyways, other people's =
problems are always more interesting that one's own (witness the growth =
of the psychotherapy industry!).

Peace,

-bws

Reply to this message...

	System.Collections.IDictionary
	System.Collections.IEnumerable
	System.Collections.Specialized.NameValueCollection
	System.Web.HttpCookie
	System.Web.HttpCookieCollection

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