VB.Net、EventArgs、ByRef 和 ByVal
在 VB.Net 中，我有一个名为 WorkflowButtonEventArgs 的对象，它继承自 System.EventArgs。
WorkflowButtonEventArgs 类包含两个 ByRef 属性。这些是内存中的对象，我不希望它们以任何方式重复或复制。
我可以在 VB.Net 中传递 WorkflowButtonEventArgs 对象 ByVal 并让它仍然保留 WorkflowButtonEventArgs 中的两个 ByRef 定义吗？
具体来说，如果我传递 ByVal：
Dim e As New WorkflowButtonEventArgs(...) ' e has some ByRef properties
RaiseEvent SomeEventName(e) ' e is passed ByVal
e（WorkflowButtonEventArgs 类）中的 ByRef Properties/Members 是否不会在内存中复制或重复？
长话短说：我可以传递 e ByVal，还是需要传递它 ByRef 因为它包含 ByRef属性？
In VB.Net, I have an object named WorkflowButtonEventArgs that inherits from System.EventArgs.
The WorkflowButtonEventArgs class contains two ByRef Properties. These are objects that are in memory, and I do not want them duplicated or copied in any way.
Can I pass the WorkflowButtonEventArgs object ByVal in VB.Net and have it still preserve the two ByRef definitions in WorkflowButtonEventArgs?
Specifically, if I pass it ByVal:
Dim e As New WorkflowButtonEventArgs(...) ' e has some ByRef properties
RaiseEvent SomeEventName(e) ' e is passed ByVal
Will the ByRef Properties/Members in e (WorkflowButtonEventArgs class) not be copied or duplicated in memory?
Long-story-short: Can I pass e ByVal, or do I need to pass it ByRef since it contains ByRef Properties?
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评论（3）
是的。即使您的
EventArgs通过 ByVal 传递，引用指向的对象也不会被复制。Yes. The objects pointed to by the reference will not get copied, even if your
EventArgsis passed ByVal.引用对象不会在内存中重复。参数上的
ByRef关键字仅意味着您可以更改调用代码中参数下的变量的值。Reference objects wont be duplicated in memory. The
ByRefkeyword on a parameter only means that you can change the value of a variable underlying the argument in the calling code.实现目标的另一种方法是创建一个存储这两个属性的单例。
Another way to achieve your goal would be to create a singleton that would store the two properties.