Theme switching won't "stick"

ksnortum · December 5th, 2010, 07:31 PM

I've setup the DropDown box to switch themes, but what happens is the Monochrome theme displays, I select DarkGrey, the page reloads, then the theme and the DropDown box both revert to monochrome.

I've zipped up my site and put it in a Google Doc:

Zip file of site is here.

TIA

--
Knute

Imar · December 6th, 2010, 05:21 AM

Hi Knute,

You forgot to add the cookie you created to the Cookies collection in the ThemeList_SelectedIndexChanged method. It's the bold line in the following code block:

Code:

 
HttpCookie preferredTheme = new HttpCookie("PreferredTheme");
preferredTheme.Expires = DateTime.Now.AddMonths(3);
preferredTheme.Value = ThemeList.SelectedValue;
Response.Cookies.Add(preferredTheme);
Response.Redirect(Request.Url.ToString());

Once you fix that, you'll get an error about the theme DarkGrey not being found. That's because your theme folder is called Dark_Grey, not DarkGrey. Once you fix that as well, the theme switcher works.

Cheers,

Imar

walbalooshi · December 6th, 2010, 05:24 AM

The code in the Frontend.master

Code:

protected void ThemeList_SelectedIndexChanged(object sender, EventArgs e)
    {
      HttpCookie preferredTheme = new HttpCookie("PreferredTheme");
      preferredTheme.Expires = DateTime.Now.AddMonths(3);
      preferredTheme.Value = ThemeList.SelectedValue;
      Response.Redirect(Request.Url.ToString());
    }

is missing a

Code:

Response.Cookies.Add(preferredTheme);

which actually sets the cookie. You need this line just before you do the redirect.

ksnortum · December 6th, 2010, 02:49 PM

Thanks guys, that was it. Funny how I knew the cookie wasn't getting writen and I looked at that section of code but missed the .add() line.

The problems with "DarkGrey" versus "Dark_Grey" are in the book. You are told on page 227, step 3 of Try it Out to add DarkGrey (no underscore) to the DropDownList. I haven't looked in the errata but it seems like a candidate.

Thanks again.

--
Knute

Imar · December 6th, 2010, 04:17 PM

Quote:

You are told on page 227, step 3 of Try it Out to add DarkGrey (no underscore) to the DropDownList.

That's absolutely correct, but Dark_Grey with an underscore is nowhere to be found in the book ;-)

Cheers,

Imar

ksnortum · December 6th, 2010, 06:52 PM

I guess I imagined it. Thanks for looking.