RedisHelper类，redis 锁

using Newtonsoft.Json;
using StackExchange.Redis;
using System;
using System.Collections.Generic;

namespace IITaxTaskScheduler.Common
{
    public class RedisHelper
    {
        private IDatabase _redisDb;
        public RedisHelper(IDatabase redisDb)
        {
            _redisDb = redisDb;
        }

        /// <summary>
        /// 取值string
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public string StringGet(string key)
        {
            return _redisDb.StringGetAsync(key).Result;
        }

        /// <summary>
        /// 赋值string
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public void SetString(string key, object value)
        {
            _redisDb.StringSetAsync(key, JsonConvert.SerializeObject(value));
        }

        /// <summary>
        /// 赋值string
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public void SetString(string key, object value, DateTime? expire)
        {
            _redisDb.StringSetAsync(key, JsonConvert.SerializeObject(value));
            if (expire != null)
            {
                _redisDb.KeyExpire(key, expire - DateTime.Now);
            }
        }

        /// <summary>
        /// 单个push
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public void LeftPush(string key, object value)
        {
            _redisDb.ListLeftPushAsync(key, JsonConvert.SerializeObject(value));
        }

        /// <summary>
        /// 批量push
        /// </summary>
        /// <param name="key"></param>
        /// <param name="list"></param>
        public void LeftPushAll(string key, List<object> list)
        {
            foreach (var item in list)
            {
                _redisDb.ListLeftPushAsync(key, JsonConvert.SerializeObject(item));
            }
        }

        /// <summary>
        /// 请求开始记录redis,并返回可否继续执行  true：可继续执行  false：不可继续执行
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public bool ActionExecuting(string key)
        {
            var result = _redisDb.HashExistsAsync(key, true);
            if (!result.Result)
            {
                _redisDb.HashIncrementAsync(key, true);
                _redisDb.KeyExpireAsync(key, new TimeSpan(0, 0, 5, 0));
                return true;
            }
            else
            {
                return false;
            }
        }

        /// <summary>
        /// 请求结算，删除redis记录
        /// </summary>
        /// <param name="key"></param>
        public void ActionExecuted(string key)
        {
            var result = _redisDb.HashExistsAsync(key, true);
            if (result.Result)
            {
                _redisDb.KeyDeleteAsync(key);
            }
        }
    }
}

 

　　判断某一key是否过期,和过期剩余时间

　　　　　　 TimeSpan? redisTS = await _redisdb.KeyTimeToLiveAsync(redisKey);
            RedisValue savedValue = await _redisdb.StringGetAsync(redisKey);

            if (savedValue.IsNull || !redisTS.HasValue || redisTS.Value.TotalSeconds == 0)
                return false;