CacheDependancy多个缓存的项目 [英] CacheDependancy for multiple Cached items

问题描述

我想有在ASP.NET CacheObject，这好像是改变了一些相关的物品会被删除的项目

所以..在请求

1. 如果出现提示，它存在于缓存中删除根对象，所有的依赖也将被删除


2. 检查根对象在缓存中，如果它不存在，添加它


3. 要缓存添加其他对象的根对象
在依赖

当我这样做，我得到一个错误试图从多个缓存条目中引用的CacheDependency对象

我看到，你可以做一个AggregateCacheDependency许多依赖应用到一个缓存项，但似乎你不能做到这一点周围的其他方法。

有没有人找到了一种方法来做到这一点？

这里是一些code，它不是我所实际存储，但它重新presents相同的任务

 公共类HomeController的：控制器
{
    私人常量字符串ROOT_KEY =ROOT;    保护覆盖无效初始化（System.Web.Routing.RequestContext的RequestContext）
    {
        base.Initialize（RequestContext的）;        如果（的Request.QueryString [clearcache]！= NULL）{
            //去掉根部，希望移除所有家属
            HttpContext.Cache.Remove（ROOT_KEY）;
        }        如果（HttpContext.Cache [ROOT_KEY] == NULL）
        {
            //创建根条目
            HttpContext.Cache [ROOT_KEY] =的String.Empty;
        }        如果（HttpContext.Cache [Request.Url.AbsolutePath] == NULL）{            //添加URL如果尚未添加
            HttpContext.Cache.Insert（
                Request.Url.AbsolutePath，的String.Empty，
                新的CacheDependency（空，新的[] {} ROOT_KEY））;
        }
    }
}
 

解决方案

以上code没有工作，的关键是每次创建一个新的CacheDependency 。
在非伪code我试图重复使用相同的对象，这是造成描述的错误。

＆@Adeel放大器;雅罗斯拉夫感谢您的答复反正

I would like to have an item in the ASP.NET CacheObject, which if it were changed a number of dependant items would be removed

So.. In a request

1. If prompted and it exists in the cache remove the root object, all dependence will be removed too
2. Check for root object in the cache, if it doesn't exist, add it
3. Add other objects to the cache with a dependency on the root object

When I do this I get an error "An attempt was made to reference a CacheDependency object from more than one Cache entry"

I see that you can do an AggregateCacheDependency to apply many dependencies to one cached item, but it seems you cannot do it the other way around.

Has any one found a way to do this?

here is some code, its not what I am actually storing but it represents the same task

public class HomeController : Controller
{
    private const string ROOT_KEY = "ROOT";

    protected override void Initialize(System.Web.Routing.RequestContext requestContext)
    {   
        base.Initialize(requestContext);

        if(Request.QueryString["clearcache"]!=null){
            // removed the root, hopefully removing all dependents
            HttpContext.Cache.Remove(ROOT_KEY);
        }

        if (HttpContext.Cache[ROOT_KEY] == null)
        {
            // create the root entry
            HttpContext.Cache[ROOT_KEY] = string.Empty;
        }

        if(HttpContext.Cache[Request.Url.AbsolutePath]==null){

            // add the url if not already added
            HttpContext.Cache.Insert(
                Request.Url.AbsolutePath, string.Empty, 
                new CacheDependency(null, new []{ROOT_KEY}));
        }
    }
}

解决方案

The above code does work, the key was creating a new CacheDependency each time. In the non-pseudo code I was attempting to reuse the same object, this was causing the error described.

@Adeel & Jaroslav thanks for the replies anyway

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