Question

我有一个MVC Web应用程序基本上查询SQL存储过程以获取产品列表，我有一个负责数据库查询的WCF服务层，有一个按类别获取产品并将数据返回到MVC网格视图。我已经设法通过将outputcache设置为3600的持续时间来缓存应用程序级别，这很好，但是只有在我对每个产品类别进行初始调用后才会缓存数据，如何在启动时使其保持一致。另外，我如何缓存WCF服务层中的数据。请查看我的代码，了解到目前为止我所拥有的内容。我对MVC很新，请你帮忙。

public class HomeController : Controller
{
    [OutputCache(Duration = 3600, Location = OutputCacheLocation.Client, VaryByParam = "none")]
    public ActionResult Index()
    {

        TopProductWCFService.TopProductServiceClient client = new TopProductWCFService.TopProductServiceClient();

        List<Top_100_Result> productType = client.GetTopProductsByTypeName();

        ViewBag.ProductType = new SelectList(productType.Select(x => x.Product_Type_Name).Distinct().OrderBy(x => x));

        return View("Index", productType);
    }

    [OutputCache(Duration = 3600)]
    public ActionResult ProductDescription(string ProductType)
    {
        TopProductWCFService.TopProductServiceClient client = new TopProductWCFService.TopProductServiceClient();

        List<Top_100_Result> productDesctriptionList = client.GetTopProductsByCategory(ProductType).Where(x => x.Product_Type_Name == ProductType).ToList();//new List<Top_100_Result>();

        return PartialView("_ProductDescription", productDesctriptionList);

    }



}


public class Service1 : ITopProductService
{
    //private const string CacheKey = "topProducts";

    public List<Top_100_Result> GetTopProductsByTypeName()
    {
        using (EmbraceEntities ctx = new EmbraceEntities())
        {
            var productObjects = ctx.Top_100(null);

            return new List<Top_100_Result>(productObjects.Distinct());
        }
    }


    public List<Top_100_Result> GetTopProductsByCategory(string productCategory)
    {

        using (EmbraceEntities ctx = new EmbraceEntities())
        {
            var productsCategoryList = ctx.Top_100(productCategory);

            return new List<Top_100_Result>(productsCategoryList);
        }
    }
}

Answer 1

要从WCF服务缓存数据，您应首先拥有缓存层。示例代码：

using System.Runtime.Caching;

public class CacheManager
{
        private static MemoryCache _cache = MemoryCache.Default;

        public static void AddToCache<T>(string key, T value)
        {
            _cache[key] = value;
        }

        public static T GetFromCache<T>(string key)
        {
            return (T)_cache[key];
        }

        public static void RemoveFromCache(string key)
        {
            _cache.Remove(key);
        }
}

然后在您的数据层中使用它，例如：

public List<Top_100_Result> GetTopProductsByTypeName()
{
    var products = CacheManager.GetFromCache<List<Top_100_Result>>("TOP_100_RESULT");

    //Add to cache if not existed
    if (products == null)
    {
            using (EmbraceEntities ctx = new EmbraceEntities())
            {
                var productObjects = ctx.Top_100(null);

                products = new List<Top_100_Result>(productObjects.Distinct());

                CacheManager.AddToCache<List<Top_100_Result>>("TOP_100_RESULT", products);
            }
    }

   return products;
}

一旦缓存数据无效，您还应该清除缓存以刷新数据。

CacheManager.RemoveFromCache("TOP_100_RESULT");

Answer 2

有很多方法可以做到这一点。也许会是：（伪代码）

在global.asax.cs

 public static Service1 MyService = new Service1();
 protected void Application_Start()
 {
     Task.CreateNew(()=>mySerivce.Init());

我会在任务中初始化你的服务。在init我会读取Entities（）并在本地缓存它们。

    GetTopProductsByTypeName()
    {
          return new List<Top_100_Result>(productObjectsCache.Distinct());

然后在更改数据对象时需要更新方法。

 public ActionResult Index()
 {
    List<Top_100_Result> productType = WebHostApplication.MyService.GetTopProductsByTypeName();

如何将缓存添加到我的MVC应用程序和WCF服务

2 个答案: