我通过COM互操作获得的“对象[*]”类型是什么？ [英] What is this `Object[*]` type I get with COM interop?

问题描述

我进行C＃excel互操作。我从C＃调用宏，并且期望对象数组。我可以从返回二维数组的宏中获取二维对象数组。

I do C# excel interop. I call macros from C#, and I expect arrays of objects. I'm able to get 2-dimensional arrays of objects from the macros which returns 2-dimensional arrays.

但是，另一个（第三方）宏应该返回一维数组。我无法使（object []）xlApp.Run（...）工作（抛出异常），并且调试器中的类型信息说明了结果类型为 Object [*] 。来自异常的实际消息是

However, an other (third party) macro is supposed to return a one-dimensional array. I can't get the (object[])xlApp.Run(...) working (it throws an exception), and the type info in the debugger says the result is of type Object[*]. The actual message from the exception is

Unable to cast object of type 'System.Object[*]' to type 'System.Object[]'.

这是什么 Object [*] 类型以及如何从中检索一维数组？

What is this Object[*] type and how do I retrieve a one-dimensional array from this ?

编辑：在我看来，这可能意味着存在SAFEARRAY的VARIANTS。但是，接下来出现两个问题：为什么二维数组一切正常？如何将SAFEARRAY转换为C＃数组？

EDIT: It occurred to me that this could mean a SAFEARRAY of VARIANTS. But then, two questions arise: why is everything ok with 2-dimensional arrays ? How do I convert a SAFEARRAY to a C# array ?

推荐答案

我对有关您的问题的各种文章感兴趣：

I foulnd various articles about your problem :

OPCFondation：基本上不是声明它作为对象数组，您可以将其声明为Array而不提供任何元素类型。因此，不要强制转换Object []，而是强制转换为Array，并使用foreach循环来使用子数组。

OPCFondation : Basically instead of declaring it as an array of objects, you can just declare it as an Array without providing any element type. So do not cast in Object[] but Array, and use a foreach loop to use the subarray.

foreach(object subobject in (Array)myarrayitem)
{
   //do stuff with the subobject, even browse further
}

此解决方案似乎可以正常工作，因为您可以再次找到它此处。

This solution seems to work since you can find it again here.

在StackOverflow 上：他们谈论的是下界> 0的数组，它为您提供了Object [*]类型，并带有一些可能对该主题感兴趣的链接，但我认为第一个想法是好的一个。

On StackOverflow : they speak about arrays with lower bound > 0, which gives you the Object[*] type, with some links that can be interesting about the subject, but I think the first idea is the good one.

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