C# 检查 WCF 服务是否正在运行的最快方法
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Quickest way to check if WCF service is running
提问by NMunro
I have a WCF service running locally. The service has a default port that it runs on, but if that port is already in use then I assign the port dynamically.
我有一个在本地运行的 WCF 服务。该服务有一个运行的默认端口，但如果该端口已被使用，那么我会动态分配该端口。
I added this in the host to make it discoverable:
我在主机中添加了它以使其可发现：
serviceHost.Description.Behaviors.Add(new ServiceDiscoveryBehavior());
serviceHost.AddServiceEndpoint(new UdpDiscoveryEndpoint());
Now my client needs to connect to this host. In the client I want to have it first try the default port, and if it can't connect to the service on the default port, then it will do the discovery.
现在我的客户端需要连接到这台主机。在客户端我想让它先尝试默认端口，如果它无法连接到默认端口上的服务，那么它就会进行发现。
I've found that the discovery takes about 20-30 seconds, so I would prefer to avoid always doing it, only when it can't find the host on the default port.
我发现发现大约需要 20-30 秒，所以我宁愿避免总是这样做，只有当它在默认端口上找不到主机时。
So my question is: what is the quickest way to determine if my host is on the default port?
所以我的问题是：确定我的主机是否在默认端口上的最快方法是什么？
I was thinking about doing something like setting the open timeout on the client to 10 seconds, and then doing a try/catch on open, but that still requires waiting 10 seconds.
我正在考虑做一些事情，比如将客户端的打开超时设置为 10 秒，然后在打开时执行 try/catch，但这仍然需要等待 10 秒。
采纳答案by NMunro
So, calling client.Open();will not throw any exceptions if your endpoint is incorrect.
因此，client.Open();如果您的端点不正确，调用不会引发任何异常。
I added a method in my service called IsAlive()which simply returns true. So I call client.IsAlive();after opening and if the endpoint is incorrect there will be an exception almost instantly.
我在我的服务中添加了一个方法，该方法IsAlive()只返回 true。所以我client.IsAlive();在打开后调用，如果端点不正确，几乎会立即出现异常。
回答by Brian
You can actually just navigate to the URL in a browser, which should show you if the web service is running. So if the WCF url is
实际上，您只需导航到浏览器中的 URL，它就会显示 Web 服务是否正在运行。所以如果 WCF 网址是
http://YourService:8000/YourClass/YourMethod
, the typing that into address bar of a browser should show you the WSDL page if the service is running, a 404 error if not.
，如果服务正在运行，则在浏览器的地址栏中键入它应该会显示 WSDL 页面，否则会显示 404 错误。
My WCF service is self hosted, so I'll add, too, that when my WCF service starts, I use a this line of code to output into a DOS windows what the current URL of my service is:
我的 WCF 服务是自托管的，所以我还要补充一点，当我的 WCF 服务启动时，我使用这行代码将我的服务的当前 URL 输出到 DOS 窗口：
Console.WriteLine("HostInterface running on http://" & Domain & ":" & Port & "/Service/Endpoint" )
