下面的插图显示具有参数修饰符的值类型和引用类型的默认封送处理行为。
The following illustration shows the default marshaling behavior of value types and reference types with parameter modifiers.
当字符串通过值传递时，被调用方绝不能改变封送拆收器所传递的引用。
When a string is passed by value, the callee must never alter the reference passed by the marshaler.
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