要使用采用服务实例的其中一个 ServiceHost 构造函数，服务的 InstanceContextMode 必须设置为 InstanceContextMode.Single。可以通过 ServiceBehaviorAttribute 进行此配置。否则，请考虑使用采用 Type 参数的 ServiceHost 构造函数。

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In order to use one of the ServiceHost constructors that takes a service instance, the InstanceContextMode of the service must be set to InstanceContextMode.Single. This can be configured via the ServiceBehaviorAttribute. Otherwise, please consider using the ServiceHost constructors that take a Type argument.

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