查询输入框中输入【%%%】能查询出所有结果的解决方案

 /// <summary>
        /// 处理查询条件中的特殊字符
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string GetStringFilter(string keyValue)
        {
            StringBuilder sb = new StringBuilder();
            bool isExists = false;
            keyValue = keyValue.Trim();
            string temp = string.Empty;

            if (!string.IsNullOrEmpty(keyValue))
            {
                string strRegex = @"[|;|,|/|（|）|[|]|}|{|%|@|*|!|‘]";
                for (int i = 0; i < keyValue.Length; i++)
                {
                    for (int m = 0; m < strRegex.Length; m++)
                    {
                        if (keyValue[i] == strRegex[m])
                        {
                            sb.Append("[" + keyValue[i] + "]");
                            isExists = true;
                            break;
                        }
                    }
                    if (isExists == false)
                    {
                        sb.Append(keyValue[i]);
                    }
                }
            }
            return sb.ToString();
        }