Step 1: Fetching an instance of the application context.
步骤1：取回一个应用程序上下文实例。
However you can only have one instance of any template in any given context.
但是在任何给定的context中，对任意模板只能有一个实例。
The session context remains associated with the instance for the lifetime of the instance.
会话上下文在实例的生命周期内保持与实例关联。
The session context remains associated with the instance for the lifetime of the instance.
会话上下文在实例的生命周期内保持与实例关联。
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