有人可以告诉我这是怎么回事..... [英] Can someone please explain to me what this does.....

问题描述

您好，我一直在使用指南来帮助我编写一个基于c#的小型excel应用程序，并且遇到了一行代码，我不知道它是如何执行的.如果有人可以给我一个简短的解释，那会很好.

Hi, I have been using a guide to help me write a small c# based excel application and have come accross a line of code that I have no idea what it acctualy does. IF someone could give me a brief explanation that would be great.

object misValue = System.Reflection.Missing.Value;
xlWorkBook.Close(true,misValue,misValue);

我不太了解misValue的实际作用.

在此先感谢

Dan

I don''t really understand how (what) misValue actually does.

Thanks in advance

Dan

推荐答案

In的意思是:

In means this: http://msdn.microsoft.com/en-us/library/system.reflection.missing.aspx[^].

Missing represents a parameter which is used by default if default parameter feature is used. Default parameters were introduced in C# v.4, but the mechanism itself already existed before. If the parameter is omitted, it is equivalent to passing a default value of the parameters. However, through Reflection, this parameter is not known to the caller. What to do? This is no any special value like null. A default parameter is specified by the author of the method to be called. Through Reflection, System.Reflection.Missing.Value should be passed.

—SA

我认为MSDN中的此页面将对此有所启发:

http://msdn.microsoft.com/en-us/library/system. Reflection.missing.value.aspx [ ^ ]

通常可以在Google的帮助下快速回答此类问题:)

I think this page in the MSDN will shed some light on it:

http://msdn.microsoft.com/en-us/library/system.reflection.missing.value.aspx[^]

Such questions can usually be answered quickly with the help of Google :)

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