本文摘自《proC#2010andthe.NET4Platform》，详细介绍了C#中引用类型的两种传递方式：按引用传递和按值传递的区别。当按引用传递时，被调用者可以改变对象的状态数据及所指向的对象；而按值传递时，只能改变对象状态但不能改变其指向的对象。
摘自：《pro C#2010 and the .NET 4 Platform》
The golden rule to keep in mind when passing reference types:
• If a reference type is passed by reference, the callee may change the values of the object’s state data as well as the object it is referencing.
• If a reference type is passed by value, the callee may change the values of the object’s state data but not the object it is referencing.
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