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Dan 1288 posts 3921 karma points c-trib

Aug 30, 2010 @ 16:41

Determine if member is logged in with ASP.NET

Hi,

An easy one for the .NET-heads no doubt, but I can only find XSLT documentation about this and am looking to do it in a .NET usercontrol instead.

Basically I just want to find out if a user is logged in, and if not, set a cookie with a GUID value if one hasn't already been set.

The code I have so far is as follows, but I have no idea how to check whether the member is logged in or not, and if not, how to generate the GUID value for the cookie. I also have no idea if I'm going about this the right way ;)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace MyProject
{
    public partial class SetCookie : System.Web.UI.UserControl
    {
     protected void Page_Load(object sender, EventArgs e)
      {
         if (umbraco.library.IsLoggedOn())
         {
             Label1.Text = "Logged in";
            }
         else
          {
             Label1.Text = "Not logged in.";

             if (Request.Cookies["visitorGUID"] == null)
               {
                 Label1.Text += "No cookie, so creating one";
                  Response.Cookies["visitorGUID"].Value = "GUID-STRING-1234567890";
                 Response.Cookies["visitorGUID"].Expires = DateTime.Now.AddDays(1);
                }
             else
              {
                 Label1.Text += "Cookie already set";
              }
         }
     }
 }
}

Presumably if "umbraco.library.IsLoggedOn" is the right thing to use here, I'll need to include a reference to an umbraco namespace at the top of the file, in which case, which one?

Any pointers for a .NET dummy much appreciated.

Thanks

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Jamie Howarth 306 posts 773 karma points c-trib

Aug 30, 2010 @ 17:42

Hi Dan,

The umbraco.library class is a static one in the umbraco namespace so a single:

using umbraco;

should do the trick. You could then just use:

if (library.IsLoggedOn()) {
    // Do whatever with your logged-in user here
} else {
    // Note use of Request object to retrieve existing value, if present...
    if (string.IsNullOrEmpty(UmbracoContext.Current.Request.Cookies["mycookie"].Value) {
        Guid myguid = Guid.NewGuid();
        // ...and Response object to set a cookie's value.
        UmbracoContext.Current.Response.Cookies["mycookie"].Value = myguid.ToString();
    }
}

HTH,

Benjamin

EDIT: Saw the bit about cookies and GUIDs, updated answer :-)

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Dan 1288 posts 3921 karma points c-trib

Aug 30, 2010 @ 17:51

0

Perfect, thank you sir!

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Dan 1288 posts 3921 karma points c-trib

Aug 30, 2010 @ 17:56

0

In fact, from your edit, what's "UmbracoContext"?

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Jamie Howarth 306 posts 773 karma points c-trib

Aug 30, 2010 @ 18:05

0

UmbracoContext is a class that represent the HttpContext for Umbraco. I can't remember the specifics as to why it was put into Umbraco 4.5 but I do remember it was to do with flaws in using HttpContext.Current from the System.Web namespace - I think it was to do with out-of-context API calls...?

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Dan 1288 posts 3921 karma points c-trib

Aug 30, 2010 @ 19:08

0

Thanks Benjamin, but when I use UmbracoContext I get errors saying "The name UmbracoContent does not exist in the current context". Any ideas?

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Jamie Howarth 306 posts 773 karma points c-trib

Aug 30, 2010 @ 19:10
0
My bad - add this as well:
```
using umbraco.presentation;
```
HTH,

Benjamin
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Hendrik Jan 71 posts 137 karma points

Aug 30, 2010 @ 20:56
0
Just a quick note, you can also use the normal asp.net funtion like this:
```
if (System.Web.HttpContext.Current.User.Identity.IsAuthenticated){ ... }
```
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Jamie Howarth 306 posts 773 karma points c-trib

Aug 31, 2010 @ 00:22

1

Niels,

It's recommended to use the new UmbracoContext class in place of HttpContext due to the reasons I mentioned above. It inherits from HttpContext so has all the same stuff in there.

Best,

Benjamin

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Dan 1288 posts 3921 karma points c-trib

Aug 31, 2010 @ 10:52
0
Thanks Chaps,

Benjamin, when I use
```
UmbracoContext.Current.Request.Cookies["mycookie"].Value
```
For example, I get more errors in the build:

Error    2    The type 'System.Web.HttpRequestWrapper' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Web.Abstractions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

Error    3    'umbraco.presentation.UmbracoRequest' does not contain a definition for 'Cookies' and no extension method 'Cookies' accepting a first argument of type 'umbraco.presentation.UmbracoRequest' could be found (are you missing a using directive or an assembly reference?)

I tried to add 'using System.Web.Abstractions' but the last part (Abstractions) doesn't appear in the intellisense selector, so was a bit wary of doing that. If I add it, the above two errors go away, but I get a new error:

Error    2    The type or namespace name 'Abstractions' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)

I think I'm just missing some namespace references in this whole thing, but have no idea how to find out which ones.

Any ideas?
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