Create Site feature for master page

Question

(I just started working with SharePoint last week excuse me if I am using some Names wrong)

I will try to explain what I have to do.

I have to change the design only of the main page of the master page

For testing I just inserted a <style> section inside of settle.master.

Now I have the final design but of course what I did is applying to all SharePoint sub sites what I don't want.

The design should be activated as Site Feature

Example of what is inside my css

/*Hide ShrePoint left navigation*/
.ms-core-navigation { DISPLAY: none }
#contentRow > #contentBox { margin-left: 0px; margin-right: 0px; }  

/*Change top SharePoint bar color blue to red*/
#suiteBar > #suiteBarLeft {background-color: red}

What I want is that this Changes are only applied to one page and the rest should use the default SharePoint design.

I am quite lost what I have to do now. Hope I could explain my issue correctly.

Answer 1

Instead of the below code:

// Enumerate through each site and apply branding.
foreach (SPWeb web in site.AllWebs)
{
     // Activate the publishing feature for all webs.
     web.Features.Add(new Guid("94c94ca6-b32f-4da9-a9e3-1f3d343d7ecb"), true);
     web.MasterUrl = webAppRelativePath + "_catalogs/masterpage/MyCustom.master";
     web.CustomMasterUrl = webAppRelativePath + "_catalogs/masterpage/MyCustom.master";

      web.Update();
 }

Use the following:

var rootWeb = site.RootWeb;
rootWeb.Features.Add(new Guid("94c94ca6-b32f-4da9-a9e3-1f3d343d7ecb"), true);

rootWeb.MasterUrl = webAppRelativePath + "_catalogs/masterpage/MyCustom.master";
rootWeb.CustomMasterUrl = webAppRelativePath + "_catalogs/masterpage/MyCustom.master";

rootWeb.Update();

This will change only the master page for Root web and not all the subsites within the site collection.

UPDATE

If you only want to apply Master Page on the web for which the feature is activated than following code should help (keep feature web level):

var webOnWhichFeatureActivate = properties.Feature.Parent as SPWeb;

SPWeb rootWeb = webOnWhichFeatureActivate.Site.RootWeb;

// Calculate relative path to site from Web Application root.
string webAppRelativePath = rootWeb.ServerRelativeUrl;
if (!webAppRelativePath.EndsWith("/"))
{
  webAppRelativePath += "/";
}

webOnWhichFeatureActivate.MasterUrl = webAppRelativePath + "_catalogs/masterpage/MyCustom.master";
webOnWhichFeatureActivate.CustomMasterUrl = webAppRelativePath + "_catalogs/masterpage/MyCustom.master";

webOnWhichFeatureActivate.Update();