程序集： Microsoft.ServiceBus（在 Microsoft.ServiceBus.dll 中）
A SessionId is a logical and lightweight way to correlate messages to each other. For example, the sender can set SessionId = "NewSessionId" of several messages as an indicator that these messages are related to each other. This SessionId does not represent any significance to the Service Bus and not checked by the service. It is for the receivers to consume if needed.