如何使用内存中持久存储编写WCF服务？

public class CustomServiceHostFactory : ServiceHostFactory
{
    protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
    {
        return new CustomServiceHost(serviceType, baseAddresses);
    }
}

public class CustomServiceHost : ServiceHost
{
    public CustomServiceHost(Type serviceType, params Uri[] baseAddresses)
        : base(serviceType, baseAddresses)
    {
    }

    protected override void OnOpening()
    {
        // 在此处实现内存中持久存储的逻辑
        // 例如：
        // var memoryCache = new MemoryCache("MyCache");
        // var myData = memoryCache.Get("MyData");
        // if (myData == null)
        // {
        //     myData = new MyData();
        //     memoryCache.Set("MyData", myData, new MemoryCacheEntryOptions { AbsoluteExpiration = DateTime.Now.AddHours(1) });
        // }

        base.OnOpening();
    }
}

<%@ ServiceHost Language="C#" Debug="true" Service="MyService" CodeBehind="MyService.svc.cs" Factory="CustomServiceHostFactory" %>