builder.Services.AddMemoryCache();

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

namespace ArticleReadCount.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class ArticleController : ControllerBase
    {
        private readonly IMemoryCache _cache;

        public ArticleController(IMemoryCache cache)
        {
            _cache = cache;
        }

        [HttpGet("{articleId}")]
        public IActionResult ReadArticle(int articleId)
        {
            var clientIp = HttpContext.Connection.RemoteIpAddress?.ToString(); // 获取用户 IP
            var cacheKey = $"ArticleRead_{articleId}_{clientIp}";

            // 检查缓存是否已有记录
            if (!_cache.TryGetValue(cacheKey, out _))
            {
                // 如果没有记录，则增加阅读量
                IncrementArticleReadCount(articleId);

                // 设置缓存，有效期为1小时
                _cache.Set(cacheKey, true, TimeSpan.FromHours(1));
            }

            return Ok($"Article {articleId} viewed.");
        }

        private void IncrementArticleReadCount(int articleId)
        {
            // 此处可以保存阅读量至数据库，示例中简单输出
            Console.WriteLine($"Article {articleId} read count incremented!");
        }
    }
}

private void IncrementArticleReadCount(int articleId)
{
    using (var context = new AppDbContext())
    {
        var article = context.Articles.FirstOrDefault(a => a.Id == articleId);
        if (article != null)
        {
            article.ReadCount++;
            context.SaveChanges();
        }
    }
}

GET http://localhost:5000/api/article/1