ContextItemManager.Unsubscribe 方法 (Type, SubscribeContextCallback)

在派生类中重写时，移除一个订阅。

命名空间： Microsoft.Windows.Design
程序集： Microsoft.Windows.Design.Extensibility（在 Microsoft.Windows.Design.Extensibility.dll 中）

语法

声明
Public MustOverride Sub Unsubscribe ( _
    contextItemType As Type, _
    callback As SubscribeContextCallback _
)

public abstract void Unsubscribe(
    Type contextItemType,
    SubscribeContextCallback callback
)

public:
virtual void Unsubscribe(
    Type^ contextItemType, 
    SubscribeContextCallback^ callback
) abstract

abstract Unsubscribe : 
        contextItemType:Type * 
        callback:SubscribeContextCallback -> unit

public abstract function Unsubscribe(
    contextItemType : Type, 
    callback : SubscribeContextCallback
)

异常	条件
ArgumentNullException	contextItemType 或 callback 为 nullnull 引用（在 Visual Basic 中为 Nothing）。