使用内存缓存时，Asp.Net MVC中的InvalidOperationException

Question

我需要In-Memory Cache在我的网站上提出申请，.NetFramework 4.5.2但出现了以下例外情况：

Unity.Exceptions.ResolutionFailedException：'解决依赖关系失败，类型='Tranship.UI.Areas.Portal.Controllers.SearchResultController'，名称='（无）'。发生以下异常：正在解决。异常是：InvalidOperationException-当前类型Microsoft.Extensions.Caching.Memory.IMemoryCache是​​一个接口，无法构造。您是否缺少类型映射？

我正在使用Asp.net MVC（不是Core）并使用Microsoft.Extensions.Caching.Memory version 1.1.2 这是我的CS文件：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tranship.Business.Core;
using Tranship.Business.Interface;
using Tranship.DataAccess.UnitOfWork;
using Tranship.Domain.Context;
using Tranship.Domain.Model;
using Tranship.DomainService.Interface;
using Tranship.ViewModel.Model;
using Tranship.ViewModel.Mapper;
using Tranship.ViewModel.Parameter;
using Microsoft.Extensions.Caching.Memory;

namespace Tranship.DomainService.Core
{
    public class ScheduleDomainService : IScheduleDomainService
    {
        private readonly IMemoryCache MemoryCache;
        private readonly string key = "TranshipMemoryCache";
        public BoundedContextUnitOfWork Context { get; set; }
        public IScheduleBiz ScheduleBiz { get; set; }
        public ScheduleDomainService(IMemoryCache memoryCache)
        {
            Context = new BoundedContextUnitOfWork(new BoundedContext());
            ScheduleBiz = new ScheduleBiz(Context);
            MemoryCache = memoryCache;
        }
        public List<ScheduleViewModel> GetScheduleBySearchParameter(SearchTripParameters parameters)
        {
            DateTime from;
            DateTime to;
            List<ScheduleViewModel> cacheObject = new List<ScheduleViewModel>();
            if (!MemoryCache.TryGetValue(key, out cacheObject))
            {
                // Cache is empty or timespan has been terminated
                cacheObject = ScheduleBiz.GetAll();
                MemoryCache.Set(key, cacheObject, new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromHours(1)));
            }
            else
            {
                // Cache is full
                cacheObject = MemoryCache.Get(key) as List<ScheduleViewModel>;
            }
            return cacheObject;
        }
    }
}

Answer 1

您需要注册IMemoryCache到Unity容器

using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Options;

UnityContainer container = new UnityContainer(); // your unity container

MemoryCacheOptions memoryCacheOptions = new MemoryCacheOptions
{
    //config your cache here
};

MemoryCache memoryCache = new MemoryCache(Options.Create<MemoryCacheOptions>(memoryCacheOptions));
container.RegisterInstance<IMemoryCache>(memoryCache);