.net FlagsAttribute枚举是否需要手动估值？

为了在显示新闻故事的方法上允许不同的格式化选项,我创建了一个枚举,可以传入以指定它的显示方式.

[Flags]
private enum NewsStyle
{
    Thumbnail = 0,
    Date = 1,
    Text = 2,
    Link = 4,
    All = 8
}

string FormatNews( DataRow news, NewsStyle style )
{
    StringBuilder HTML = new StringBuilder();

    // Should the link be shown
    if ( ((newsStyle & NewsStyle.All) == NewsStyle.All || (newsStyle & NewsStyle.Link) == NewsStyle.Link))
    {
                HTML.AppendFormat("",
                                  UrlEncode(newsStory["NewsStoryID"].ToString()));
    }

    // Etc etc...
}

// So to call the method...
Response.Write( FormatNews( news, NewsStyle.Date | NewsStyle.Text ) );

[Flags]
enum Foo
{
    None,
    Bar,
    Baz, 
    BarAndBaz
}