轮询设备的 WCF 异步回调设置
我有一个 WCF 服务设置来从我们的 .Net 应用程序控制 USB 指纹读取器。这工作正常，我可以要求它注册用户等等。
阅读器允许识别（它告诉您特定用户已经出示了他们的手指，而不是要求它验证特定用户的手指是否存在），但在识别模式下必须不断轮询设备以了解其状态 - 当用户检测到状态变化。
我想要的是感兴趣的应用程序通知服务它想知道何时识别用户，并提供在发生这种情况时触发的回调。 WCF 服务将立即返回并在后台生成一个线程来持续轮询设备。如果没有人尝试登录，这种轮询可能会持续几个小时。
实现这一目标的最佳方法是什么？我的服务协定当前定义如下：
[ServiceContract (CallbackContract=typeof(IBiometricCallback))]
public interface IBiometricWcfService
{
...
[OperationContract (IsOneWay = true)]
void BeginIdentification();
...
}
public interface IBiometricCallback
{
...
[OperationContract(IsOneWay = true)]
void IdentificationFinished(int aUserId, string aMessage, bool aSuccess);
...
}
在我的 BeginIdentification() 方法中，我可以轻松地生成一个工作线程来轮询设备，还是更容易使 WCF 服务异步？
I have a WCF service setup to control a USB fingerprint reader from our .Net applications. This works fine and I can ask it to enroll users and so on.
The reader allows identification (it tells you that a particular user has presented their finger, as opposed to asking it to verify that a particular user's finger is present), but the device must be constantly polled while in identification mode for its status - when a user is detected the status changes.
What I want is for an interested application to notify the service that it wants to know when a user is identified, and provide a callback that gets triggered when this happens. The WCF service will return immediately and spawn a thread in the background to continuously poll the device. This polling could go on for hours at a time if no one tries to log in.
What's the best way to acheive this? My service contract is currently defined as follows:
[ServiceContract (CallbackContract=typeof(IBiometricCallback))]
public interface IBiometricWcfService
{
...
[OperationContract (IsOneWay = true)]
void BeginIdentification();
...
}
public interface IBiometricCallback
{
...
[OperationContract(IsOneWay = true)]
void IdentificationFinished(int aUserId, string aMessage, bool aSuccess);
...
}
In my BeginIdentification() method can I easily spawn a worker thread to poll the device, or is it easier to make the WCF service asynchronous?
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我认为将WCF服务操作异步化要好得多。此 MSDN 文章介绍了如何执行此操作：http://msdn.microsoft.com /en-us/library/ms730059.aspx。
I think it is much better to make the WCF service operation asynchronously. This MSDN article shows how to do it:http://msdn.microsoft.com/en-us/library/ms730059.aspx.