Type downcasting is performed , as required . when copying from a reference - type array to a value - type array , each element is unboxed and then copied 在从引用类型的数组复制到值类型的数组时，每一个元素都要取消装箱，然后再复制。
Casts in j must be more explicit than in other . net languages since j does not support automatic boxing and unboxing of value types 由于j #不支持自动的值类型装箱和取消装箱，因此j #中的强制转换必须比其他. net语言中的强制转换更明确。
However , if they are used in scenarios that require a significant amount of boxing and unboxing , they perform poorly as compared to reference types 然而，如果在要求大量的装箱和取消装箱操作的情况下使用，则值类型的表现就不如引用类型。
Additional processing is done on the elements individually , such as boxing and unboxing or conversions , which affect the performance of the collection 类型的集合中，单独对各元素执行附加的处理，例如装箱和取消装箱或转换，这影响该集合的性能。
The two boxed objects are identical to those created by boxing non - nullable types . and , like non - nullable boxed types , can be unboxed into nullable types , like this 并且，像非可空装箱类型一样，可以将它们取消装箱，使其成为可空类型，如下所示：
Strongly typed collections provide automatic type validation and avoid processes that adversely affect performance , such as boxing and unboxing and conversions 强类型集合提供自动类型验证，并且可避免那些对性能有副作用的进程，如装箱、取消装箱和转换。
Owners of some tivo digital video recorders that have high - speed internet access may download unbox movies directly to their televisions , the companies said yesterday 公司昨天称，拥有数字录像机的顾客，如果他们拥有高速的互联网接入速度，他们可以直接下载电影到他们的电视机中。
For the unboxing of value types to succeed at run time , the item being unboxed must be a reference to an object that was previously created by boxing an instance of that value type 要在运行时成功取消装箱值类型，被取消装箱的项必须是对一个对象的引用，该对象是先前通过装箱该值类型的实例创建的。
