ChannelFactory:创建和处置

Question

我已经编写了一个由WPF客户端使用的Sdk，并负责调用WCF服务和缓存。这些WCF服务是使用ChannelFactory调用的，所以我没有服务引用。为此，我创建了一个处理打开和关闭ChannelFactory和ClientChannel的工厂，如下所示：

public class ProjectStudioServiceFactory : IDisposable
{
    private IProjectStudioService _projectStudioService;
    private static ChannelFactory<IProjectStudioService> _channelFactory;

    public IProjectStudioService Instance
    {
        get
        {
            if (_channelFactory==null) _channelFactory = new ChannelFactory<IProjectStudioService>("ProjectStudioServiceEndPoint");
            _projectStudioService = _channelFactory.CreateChannel();
            ((IClientChannel)_projectStudioService).Open();                
            return _projectStudioService;
        }
    }

    public void Dispose()
    {
        ((IClientChannel)_projectStudioService).Close();
        _channelFactory.Close();
    }       
}

我调用的每个请求如下所示：

 using (var projectStudioService = new ProjectStudioServiceFactory())
        {
            return projectStudioService.Instance.FindAllCities(new FindAllCitiesRequest()).Cities;
        }

虽然这种方法可以工作，但速度很慢，因为对于每个请求，客户端通道和工厂都是打开和关闭的。如果我让它开着，它会很快。但我想知道最好的做法是什么？我应该让它一直开着吗？还是不想？如何以正确的方式处理这个问题？

Answer 1

谢谢大牛，我没看到那个帖子。所以我猜以下可能是一个好的方法：

public class ProjectStudioServiceFactory : IDisposable
{
    private static IProjectStudioService _projectStudioService;
    private static ChannelFactory<IProjectStudioService> _channelFactory;

    public IProjectStudioService Instance
    {
        get
        {
            if (_projectStudioService == null)
            {
                _channelFactory = new ChannelFactory<IProjectStudioService>("ProjectStudioServiceEndPoint");
                _projectStudioService = _channelFactory.CreateChannel();
               ((IClientChannel)_projectStudioService).Open(); 
            }                               
            return _projectStudioService;
        }
    }

    public void Dispose()
    {
        //((IClientChannel)_projectStudioService).Close();
        //_channelFactory.Close();
    }       
}