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

Question

我需要在我的网站上使用 .NetFramework 4.5.2 应用 In-Memory Cache，但我遇到了这个异常：

Unity.Exceptions.ResolutionFailedException: 'Resolution of the dependency failed, type = 'Tranship.UI.Areas.Portal.Controllers.SearchResultController', name = '(none)'. Exception occurred while: while resolving. Exception is: InvalidOperationException - The current type, Microsoft.Extensions.Caching.Memory.IMemoryCache, is an interface and cannot be constructed. Are you missing a type mapping?

我正在使用 Asp.net MVC（不是核心）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

为了能够在 .net 核心中使用基于 .net 4.5.2 的现有缓存实现，我将其移植为使用 System.Runtime 缓存 而不是系统网络。很有魅力。

Here's official documentation

Answer 2

您需要将 IMemoryCache 注册到 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);

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

InvalidOperationException in Asp.Net MVC while using In-Memory Cache

c#

asp.net-mvc

asp.net-core

caching

memorycache