Question

Windows Server AppFabric 1.0是否存在asp.net输出缓存提供程序？

Answer 1

没有。但是因为输出缓存在ASP.NET 4.0中是可插入的（使用提供者模型），所以您可以自己编写。

要创建新的输出缓存提供程序，您需要继承System.Web.Caching.OutputCacheProvider，您需要引用System.Web和System.Configuration。

然后，它主要是覆盖基础提供程序中的四种方法，Add，Get，Remove和Set。

由于您的网站可能会获得相当多的点击量，您肯定希望为DataCacheFactory使用Singleton，此代码使用Jon Skeet's singleton pattern（假设我已正确理解它）。

using System;
using System.Web.Caching;
using Microsoft.ApplicationServer.Caching;

namespace AppFabricOutputCache
{
public sealed class AppFabricOutputCacheProvider : OutputCacheProvider
{
    private static readonly AppFabricOutputCacheProvider instance = new AppFabricOutputCacheProvider();
    private DataCacheFactory factory;
    private DataCache cache;

    static AppFabricOutputCacheProvider()
    { }

    private AppFabricOutputCacheProvider()
    {
        // Constructor - new up the factory and get a reference to the cache based 
        // on a setting in web.config
        factory = new DataCacheFactory();
        cache = factory.GetCache(System.Web.Configuration.WebConfigurationManager.AppSettings["OutputCacheName"]);
    }

    public static AppFabricOutputCacheProvider Instance
    {
        get { return instance; }
    }

    public override object Add(string key, object entry, DateTime utcExpiry)
    {
        // Add an object into the cache. 
        // Slight disparity here in that we're passed an absolute expiry but AppFabric wants
        // a TimeSpan. Subtract Now from the expiry we get passed to create the TimeSpan
        cache.Add(key, entry, utcExpiry - DateTime.UtcNow);
    }

    public override object Get(string key)
    {
        return cache.Get(key);
    }

    public override void Remove(string key)
    {
        cache.Remove(key);
    }

    public override void Set(string key, object entry, DateTime utcExpiry)
    {
        // Set here means 'add it if it doesn't exist, update it if it does'
        // We can do this by using the AppFabric Put method
        cache.Put(key, entry, utcExpiry - DateTime.UtcNow);
    }
}
}

编写完成后，需要配置应用程序以在web.config中使用它：

<system.web>
    <caching>
        <outputCache defaultProvider="AppFabricOutputCache">
            <providers>
                <add name="AppFabricOutputCache" type="AppFabricOutputCache, AppFabricOutputCacheProvider" />
            </providers>
        </outputCache>
     </caching>
</system.web>

MSDN: OutputCacheProvider
ScottGu's blog on creating OutputCacheProviders

用于asp.net输出缓存的Windows Server Appfabric提供程序

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