C# 无法从ViewComponent中解析缓存服务

我正在Startup.cs中注册缓存服务，如下所示：

    public void ConfigureServices(IServiceCollection services)
    {

        services.AddMemoryCache();            
        services.AddTransient<DataFacade, DataFacade>();
        ...
    }

using MyApp.Services;
using MyApp.Website.ModelBuilder;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Mvc;

namespace MyApp.Website.ViewComponents
{
    [ViewComponent]
    public class Header : ViewComponent
    {
        private readonly HeaderModelBuilder _modelBuilder;

        public Header(HeaderModelBuilder modelBuilder)
        {
            _modelBuilder = modelBuilder;
        }

using System;
using MyApp.Data;
using MyApp.Data.ExternalSiteData;
using MyApp.Domain.Services.Data;
using Microsoft.Extensions.Caching.Memory;

namespace MyApp.Services
{
    public class DataFacade
    {
        private MemoryCache _cache;
        public DataFacade(MemoryCache memoryCache)
        {
            _cache = memoryCache;
        }

这将调用ModelBuilder组件，并具有如下构造函数：

    public void ConfigureServices(IServiceCollection services)
    {

        services.AddMemoryCache();            
        services.AddTransient<DataFacade, DataFacade>();
        ...
    }

using MyApp.Services;
using MyApp.Website.ModelBuilder;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Mvc;

namespace MyApp.Website.ViewComponents
{
    [ViewComponent]
    public class Header : ViewComponent
    {
        private readonly HeaderModelBuilder _modelBuilder;

        public Header(HeaderModelBuilder modelBuilder)
        {
            _modelBuilder = modelBuilder;
        }

using System;
using MyApp.Data;
using MyApp.Data.ExternalSiteData;
using MyApp.Domain.Services.Data;
using Microsoft.Extensions.Caching.Memory;

namespace MyApp.Services
{
    public class DataFacade
    {
        private MemoryCache _cache;
        public DataFacade(MemoryCache memoryCache)
        {
            _cache = memoryCache;
        }

…并且ModelBuilder服务引用DataFacade服务：

using MyApp.Data.ExternalCountryData;
using MyApp.Services;
using MyApp.Website.Constants;
using MyApp.Website.Models;

namespace MyApp.Website.ModelBuilder
{
    public class HeaderModelBuilder
    {
        private readonly DataFacade _dataFacade;

        public HeaderModelBuilder(DataFacade dataFacade)
        {
            _dataFacade = dataFacade;
        }

…其构造函数如下所示：

    public void ConfigureServices(IServiceCollection services)
    {

        services.AddMemoryCache();            
        services.AddTransient<DataFacade, DataFacade>();
        ...
    }

using MyApp.Services;
using MyApp.Website.ModelBuilder;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Mvc;

namespace MyApp.Website.ViewComponents
{
    [ViewComponent]
    public class Header : ViewComponent
    {
        private readonly HeaderModelBuilder _modelBuilder;

        public Header(HeaderModelBuilder modelBuilder)
        {
            _modelBuilder = modelBuilder;
        }

using System;
using MyApp.Data;
using MyApp.Data.ExternalSiteData;
using MyApp.Domain.Services.Data;
using Microsoft.Extensions.Caching.Memory;

namespace MyApp.Services
{
    public class DataFacade
    {
        private MemoryCache _cache;
        public DataFacade(MemoryCache memoryCache)
        {
            _cache = memoryCache;
        }

但是，在运行代码时，Program.cs会抛出以下命令：

InvalidOperationException:无法解析类型的服务 “Microsoft.Extensions.Caching.Memory.MemoryCache”时尝试 激活“MyApp.Services.DataFacade”

如果我注释掉视图组件，应用程序的其他部分可以很好地访问缓存

---

为什么视图组件会出现问题？我是否错误地注册了一个服务？

注入了

IMemoryCache

抽象，而不是实现

public class DataFacade {
    private readonly IMemoryCache _cache;

    public DataFacade(IMemoryCache memoryCache) {
        _cache = memoryCache;
    }

    //...

参考文献 添加内存缓存的源代码在向服务集合注册时添加了接口

/// <summary>
/// Adds a non distributed in memory implementation of <see cref="IMemoryCache"/> to the
/// <see cref="IServiceCollection" />.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection" /> to add services to.</param>
/// <returns>The <see cref="IServiceCollection"/> so that additional calls can be chained.</returns>
public static IServiceCollection AddMemoryCache(this IServiceCollection services)
{
    if (services == null)
    {
        throw new ArgumentNullException(nameof(services));
    }

    services.AddOptions();
    services.TryAdd(ServiceDescriptor.Singleton<IMemoryCache, MemoryCache>());

    return services;
}

//
///将的非分布式内存中实现添加到
/// .
/// 
///要将服务添加到的。
///这样就可以链接其他调用。
公共静态IServiceCollection AddMemoryCache（此IServiceCollection服务）
{
if（服务==null）
{
抛出新的ArgumentNullException（nameof（services））；
}
services.AddOptions（）；
services.TryAdd（servicescriptor.Singleton（））；
返回服务；
}