ASP .NET Core MemoryCache緩存

Redis緩存請看這篇博客

安裝Nuget包

Microsoft.Extensions.Caching.Memory

添加緩存服務

services.AddMemoryCache();

使用緩存

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Caching.Memory;

namespace WebApplication2.Controllers;

[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{

    private readonly IMemoryCache _memoryCache;

    public WeatherForecastController(IMemoryCache memoryCache)
    {
        _memoryCache = memoryCache;
    }

    [HttpGet]
    public async Task Get()
    {
        string cacheKey = "cachekey";
        string cacheValue = "1";

        //添加緩存
       _memoryCache.Set(cacheKey, cacheValue, TimeSpan.FromMinutes(1));

        if (_memoryCache.TryGetValue(cacheKey, out string cacheValue2))
           _memoryCache.Set(cacheKey, cacheValue, DateTimeOffset.Now.AddHours(1));

        //獲取值
        _memoryCache.Get(cacheKey).ToString();
        _memoryCache.Get<string>(cacheKey);
        bool isExist = _memoryCache.TryGetValue(cacheKey, out string cacheValue3);

        //獲取或創建
        var c = _memoryCache.GetOrCreate("cache1", entry =>
         {
             entry.AbsoluteExpiration = DateTimeOffset.Now.AddHours(1);
             //entry.AbsoluteExpirationRelativeToNow = TimeSpan.FromMinutes(1);
             return "1";
         });
    }
}

幫助類

    /// <summary>
    /// Cache緩存操作類
    /// </summary>
    public class CacheHelper
    {
        protected IMemoryCache cache;

        /// <summary>
        /// </summary>
        /// <param name="cache">IMemoryCache</param>
        public CacheHelper(IMemoryCache cache)
        {
            this.cache = cache;
        }

        /// <summary>
        /// 添加緩存
        /// </summary>
        /// <param name="key">緩存鍵</param>
        /// <param name="value">緩存string</param>
        /// <param name="timeSpan">設置Redis緩存的過期策略</param>
        public void SetString(string key, string value, TimeSpan timeSpan) => cache.Set(key, value, timeSpan);

        /// <summary>
        /// Redis中獲取鍵值
        /// </summary>
        /// <param name="key">緩存鍵</param>
        /// <returns>緩存String</returns>
        public string? GetString(string key) => cache.Get<string>(key);

        /// <summary>
        /// 查詢鍵值是否存在
        /// </summary>
        /// <param name="key">緩存鍵</param>
        /// <returns>true：存在，false：不存在</returns>
        public bool Exist(string key) => cache.Get(key) != null;

        /// <summary>
        /// 刪除緩存
        /// </summary>
        /// <param name="key">緩存鍵</param>
        public void Remove(string key) => cache.Remove(key);
    }