Exclude Category from the Feed doesn't work in WordPress

WordPress version: 3.1

I need to exclude one category from Feed, so I add the following function to the functions.php file. However, it doesn't work. How to fix it?

function ExcludeCategory($query) {
    if ($query->is_feed) {
        $query->set('cat开发者_开发知识库','-1716');
    }
    return $query;
}
add_filter('pre_get_posts','ExcludeCategory');

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this'll work:

$query->set( 'category__not_in', '-1716' );

seems to be a problem with or change in in 3.1:

http://themehybrid.com/support/topic/exclude-category-from-archive-with-pre_get_posts#post-56892

http://wordpress.org/support/topic/query_posts-no-longer-working-in-31

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I am not sure if you are referring to the blog home page. If that's the case then you probably need to replace 'feed' with 'home'. Otherwise, the code seems fine.

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Change your feed structure.

E.g.

/feed?cat=-1716">Entries (RSS)

You might need to change this in FeedBurner too.