创建 WCF ChannelFactory<T>

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问题描述

我正在尝试将现有的 .NET Remoting 应用程序转换为 WCF.服务器和客户端共享公共接口，所有对象都是服务器激活的对象.

I'm trying to convert an existing .NET Remoting application to WCF. Both server and client share common interface and all objects are server-activated objects.

在 WCF 世界中，这类似于创建按调用服务并使用 ChannelFactory 创建代理.我在如何为 ASP.NET 客户端正确创建 ChannelFactory 方面遇到了一些困难.

In WCF world, this would be similar to creating per-call service and using ChannelFactory<T> to create a proxy. I'm struggling a bit with how to properly create ChannelFactory<T> for an ASP.NET client.

出于性能原因，我想缓存 ChannelFactory 对象，并在每次调用服务时创建频道.在 .NET 远程处理时代，曾经有 RemotingConfiguration.GetRegisteredWellknownClientTypes() 方法来获取我可以缓存的客户端对象集合.看来，在 WCF 世界中没有这样的事情，尽管我能够从配置文件中获取端点集合.

For performance reasons, I want to cache ChannelFactory<T> objects and just create channel every time I call the service. In .NET remoting days, there used to be RemotingConfiguration.GetRegisteredWellknownClientTypes() method to get a collection of client objects that I could then cache. It appears, in WCF world there is no such thing, although I was able to get a collection of endpoints from config file.

现在这是我认为可行的方法.我可以创建这样的东西:

Now here is what I think will work. I can create something like this:

public static ProxyHelper
{
    static Dictionary<Type, object> lookup = new Dictionary<string, object>();  

    static public T GetChannel<T>()
    {
        Type type = typeof(T);
        ChannelFactory<T> factory;

        if (!lookup.ContainsKey(type))
        {
            factory = new ChannelFactory<T>();
            lookup.Add(type, factory);
        }
        else
        {
            factory = (ChannelFactory<T>)lookup[type];
        }

        T proxy = factory.CreateChannel();   
        ((IClientChannel)proxy).Open();

        return proxy;
    }    
}

我认为上面的代码可以工作，但我有点担心多个线程试图添加新的 ChannelFactory 对象，如果它不在查找中.由于我使用的是 .NET 4.0，我在考虑使用 ConcurrentDictionary 并使用 GetOrAdd() 方法或首先使用 TryGetValue() 方法检查 ChannelFactory 是否存在和不存在，然后使用 GetOrAdd() 方法.不确定 ConcurrentDictionary.TryGetValue() 和 ConcurrentDictionary.GetOrAdd() 方法的性能.

I think the above code will work, but I'm a bit worried about multiple threads trying to add new ChannelFactory<T> objects if it's not in the lookup. Since I'm using .NET 4.0, I was thinking about using ConcurrentDictionary and use GetOrAdd() method or use TryGetValue() method first to check if ChannelFactory<T> exists and it does not exist, then use GetOrAdd() method. Not sure about performance though of ConcurrentDictionary.TryGetValue() and ConcurrentDictionary.GetOrAdd() method.

另一个小问题是我是否需要在 ASP.NET 应用程序结束后对通道工厂对象调用 ChannelFactory.Close() 方法，或者我可以让 .NET 框架在其上处理通道工厂对象自己的.使用 ((IChannel)proxy).Close() 方法调用服务方法后，代理通道将始终关闭.

Another minor question is whether I need to call ChannelFactory.Close() method on channel factory objects after ASP.NET application ends or can I just let .NET framework dispose the channel factory objects on its own. The proxy channel will always be closed after calling service method by using ((IChannel)proxy).Close() method.

ChannelFactory

创建 WCF ChannelFactory&lt;T&gt;

问题描述

推荐答案

创建 WCF ChannelFactory<T>