OperationContext.Current 为 null，所有其他上下文也是如此
我有一个 WCF 服务定义如下：
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
[ServiceBehavior(IncludeExceptionDetailInFaults = true, InstanceContextMode = InstanceContextMode.PerCall)]
public partial class FrontEndService : IFrontEndService
但是，大多数时候（但并非总是）InstanceContext.Current 为 null，以及 HttpContext.Current 和 OperationContext.Current 也是 null。
我缺少什么？我想要做的是将一些数据存储在 HttpContext.Current.Items 或在请求长度内存在的类似集合中。
I have a WCF service defined as following:
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
[ServiceBehavior(IncludeExceptionDetailInFaults = true, InstanceContextMode = InstanceContextMode.PerCall)]
public partial class FrontEndService : IFrontEndService
However, most of the time (but not always) InstanceContext.Current is null, as well as HttpContext.Current and OperationContext.Current is also null.
What am I missing? What I want to do is store some data in HttpContext.Current.Items or a similar collection that exists for the length of the request.
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该服务只是从另一个线程调用，而不是通过 HTTP，这就是所有上下文都为空的原因。
The service was just being called from another thread, and not via HTTP, that's why all Contexts were null.