Converts an ICommand object to and from other types.
将对象的值转换为不同的数据类型。
The second issue exists in Silverlight 3 because the ICommand interface is provided, but not implemented.
第二个问题存在于Silverlight 3 中，因为在Silverlight 3 中ICommand接口是提供了，但是没有被实现。
An "undo" feature can be added to this framework relatively easily. An undo operation can be added to ICommand and implemented in each ConcreteCommand.
“undo”特性能被相对容易地添加到这个框架中，undo操作可以被添加到ICommand，并且在每个ConcreteCommand中实现。
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