问题描述
我搜索这些所谓的结果的,但没有找到任何有关我的问题。我怀疑这可能是重复的。
I searched these SO results and couldn't find anything related to my question. I doubt this could be a duplicate.
我目前正在写一个Microsoft.Office.Interop.Excel PIA包装器.NET C#3.5,并想知道什么是最好的,同时呼吁像打开一个给定的工作簿的方法来使用。
I'm currently writing a Microsoft.Office.Interop.Excel PIA wrapper in .NET C# 3.5 and was wondering about what is best to use while calling methods like opening a given workbook.
<$c$c>System.Type.Missing$c$c>或<$c$c>Missing.Value$c$c>?
我已经进行了一些谷歌搜索,并不能找到任何区别,只不过一个是从系统
命名空间( System.Type.Missing 的),而其他(的 Missing.Value 的)来自的System.Reflection
命名空间。
I have performed a few Google searches, and can't find any difference, except that one is from the System
namespace (System.Type.Missing), and the other (Missing.Value) comes from the System.Reflection
namespace.
- 是什么,主要的区别,如果有的话,在两者之间?
- 在何种情况下一个是最好的比其他使用?
- 为什么会这样呢?
似乎都被用来当你想一个参数的默认值传递给互操作程序集...
Both seem to be used when you want to pass a parameter's default value to the interop assembly...
谢谢您的回答! =)
推荐答案
他们是相同的。在键入
的静态初始化,现场缺少
设置为 System.Reflection.Missing .value的
。
They are the same. In the static initializer of Type
, the field Missing
is set to System.Reflection.Missing.Value
.
至于为什么有越来越相同值的方法有两种:谁知道。这是相当可能的,这是一个向后兼容残余,如 Type.Missing
的类型为对象
,而 Missing.Value
键入缺少
。
As for why there are two ways of getting at the same value: who knows. It's quite likely that this is a backward compatibility remnant, as Type.Missing
is typed as object
, whereas Missing.Value
is typed Missing
.
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