C#中此语句的含义是什么? [英] What is the meaning of this statement in C#?

问题描述

我已经开发了一个将doc转换为pdf文件的示例应用程序.
但是我只想知道这句话的意思.

I have developed a sample app on converting the doc to pdf file.
But I just want to know the meaning of this statement.

object Unknown=Type.Missing;
 MSDOC.Documents.Open(ref Source, ref Unknown,
                ref Unknown, ref Unknown, ref Unknown,
                ref Unknown, ref Unknown, ref Unknown,
                ref Unknown, ref Unknown, ref Unknown,
                ref Unknown, ref Unknown, ref Unknown,
                ref Unknown, ref Unknown);

为什么我们写"ref Unknown"?请给我解释.

在此先感谢

Why do we write the "ref Unknown"? Please explain me.

Thanks in advance

推荐答案

这意味着您不必关心传递给调用的COM方法的参数的值.在某些语言中，可能会遗漏那些值.

在C#中，您必须全部通过.

It means that you don''t care about the value of parameter passed to the invoked COM method. In some languages can be those values missed.

In C# you must pass all of them.

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