/// <summary>
        /// 获得浏览器类型字符 贾世义
        /// </summary>
        /// <param name="browser"></param>
        /// <returns>FF(Firfox) SF(Safari) OE(Opera) IE</returns>
        public static string GetBrowser(HttpBrowserCapabilities browser)
        {
            if (browser == null)
            {
                return "IE";
            }
            else if (browser.Browser.IndexOf("IE", StringComparison.CurrentCultureIgnoreCase) != -1)
            {
                return "IE";
            }
            if (browser.Browser.IndexOf("Firefox", StringComparison.CurrentCultureIgnoreCase) != -1)
            {
                return "FF";
            }
            else if (browser.Browser.IndexOf("Safari", StringComparison.CurrentCultureIgnoreCase) != -1)
            {
                return "SF";
            }
            else if (browser.Browser.IndexOf("Opera", StringComparison.CurrentCultureIgnoreCase) != -1)
            {
                return "OE";
            }
            else
            {
                return "IE";
            }
        }
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