去除文本中的标签

 /// <summary>
        /// 去除文本中的标签Method to make sure that user's inputs are not malicious
        /// </summary>
        /// <param name="text">User's Input</param>
        /// <param name="maxLength">Maximum length of input</param>
        /// <returns>The cleaned up version of the input</returns>
        public static string InputText(string text, int maxLength) {
            text = text.Trim();
            if (string.IsNullOrEmpty(text))
                return string.Empty;
            if (text.Length > maxLength)
                text = text.Substring(0, maxLength);
            text = Regex.Replace(text, "[\\s]{2,}", " "); //two or more spaces
            text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|\\n)*?>)", "\n"); //<br>
            text = Regex.Replace(text, "(\\s*&[n|N][b|B][s|S][p|P];\\s*)+", " "); //&nbsp;
            text = Regex.Replace(text, "<(.|\\n)*?>", string.Empty); //any other tags
            text = text.Replace("'", "''");
            return text;
        }
        /// <summary>
        /// Method to check whether input has other characters than numbers
        /// </summary>
        public static string CleanNonWord(string text) {
            return Regex.Replace(text, "\\W", "");
        }
        /// <summary>
        /// Method to redirect user to search page
        /// </summary>
        /// <param name="key">Search keyword</param> 
        public static void SearchRedirect(string key) {
            HttpContext.Current.Response.Redirect(string.Format(REDIRECT_URL, InputText(key, 255)));
        }
        /// <summary>
        /// Method to retrieve and cache category name by its ID
        /// </summary>
        /// <param name="categoryId">Category id</param>
        /// <returns>Category name</returns>
        public static string GetCategoryName(string categoryId) {
            Category category = new Category();
            if (!enableCaching)
                return category.GetCategory(categoryId).Name;
            string cacheKey = string.Format(CATEGORY_NAME_KEY, categoryId);
            // Check if the data exists in the data cache
            string data = (string)HttpRuntime.Cache[cacheKey];
            if (data == null) {
                // Caching duration from Web.config
                int cacheDuration = int.Parse(ConfigurationManager.AppSettings["CategoryCacheDuration"]);
                // If the data is not in the cache then fetch the data from the business logic tier
                data = category.GetCategory(categoryId).Name;
                // Create a AggregateCacheDependency object from the factory
                AggregateCacheDependency cd = DependencyFacade.GetCategoryDependency();
                // Store the output in the data cache, and Add the necessary AggregateCacheDependency object
                HttpRuntime.Cache.Add(cacheKey, data, cd, DateTime.Now.AddHours(cacheDuration), Cache.NoSlidingExpiration, CacheItemPriority.High, null);
            }
            return data;
        }