Masuit.LuceneEFCore.SearchEngine/Masuit.LuceneEFCore.SearchEngine/Extensions/StringHelpers.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Masuit.LuceneEFCore.SearchEngine.Extensions
{
    public static class StringHelpers
    {
        /// <summary>
        /// 移除字符串的指定字符
        /// </summary>
        /// <param name="s"></param>
        /// <param name="chars"></param>
        /// <returns></returns>
        internal static string RemoveCharacters(this string s, IEnumerable<char> chars)
        {
            return string.IsNullOrEmpty(s) ? string.Empty : new string(s.Where(c => !chars.Contains(c)).ToArray());
        }

        /// <summary>
        /// 去除html标签后并截取字符串
        /// </summary>
        /// <param name="html">源html</param>
        /// <returns></returns>
        internal static string RemoveHtmlTag(this string html)
        {
            var strText = Regex.Replace(html, "<[^>]+>", "");
            strText = Regex.Replace(strText, "&[^;]+;", "");
            return strText;
        }

        /// <summary>
        /// 添加多个元素
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="this"></param>
        /// <param name="values"></param>
        public static void AddRange<T>(this ICollection<T> @this, IEnumerable<T> values)
        {
            foreach (var obj in values)
            {
                @this.Add(obj);
            }
        }

        /// <summary>
        /// 移除符合条件的元素
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="this"></param>
        /// <param name="where"></param>
        public static void RemoveWhere<T>(this ICollection<T> @this, Func<T, bool> @where)
        {
            foreach (var obj in @this.Where(where).ToList())
            {
                @this.Remove(obj);
            }
        }

    }
}