How can I change the background of a masterpage from the code behind of a content page?

Asked 5/8, 2008 at 12:46 Answered 5/8, 2008 at 13:28

I specifically want to add the style of background-color to the <body> tag of a master page, from the code behind (C#) of a content page that uses that master page.

I have different content pages that need to make the master page has different colors depending on which content page is loaded, so that the master page matches the content page's theme.

I have a solution below:

I'm looking for something more like:

Master.Attributes.Add("style", "background-color: 2e6095");

Inside of the page load function of the content page. But I can't get the above line to work. I only need to change the background-color for the <body> tag of the page.

Iolenta answered 5/8, 2008 at 12:46 Comment(1)

Here is a better solution #21476568 – Craver 27/7, 2016 at 18:0

What I would do for the particular case is:

i. Define the body as a server side control

<body runat="server" id="masterpageBody">

ii. In your content aspx page, register the MasterPage with the register:

<% MasterPageFile="..." %>

iii. In the Content Page, you can now simply use

Master.FindControl("masterpageBody")

and have access to the control. Now, you can change whatever properties/style that you like!

Oxalis answered 5/8, 2008 at 12:56 Comment(1)

Would you mind to clarify Master.FindControl("masterpageBody") and add some example to add css class, please. – Craver 27/7, 2016 at 17:34

This is what I came up with:

In the page load function:

HtmlGenericControl body = (HtmlGenericControl)Master.FindControl("default_body");
body.Style.Add(HtmlTextWriterStyle.BackgroundColor, "#2E6095");

Where

default_body = the id of the body tag.

Iolenta answered 5/8, 2008 at 13:28 Comment(0)

I believe you are talking about a content management system. The way I have delt with this situation in the past is to either:

Allow a page/content to define an extra custom stylesheet or
Allow a page/content to define inline style tags

Podgorica answered 5/8, 2008 at 12:49 Comment(0)

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