Why Does VS 2010 'Comment' Keyboard Shortcut Change in C++?

问题

For me, Visual Studio's Ctrl + K, Ctrl + C keyboard shortcut is used to comment-out the selected lines. When editing C++, this sometimes uses block comments (/* */) and sometimes uses line comments (//). Why does it change? How does it decide which to use when?

回答1:

A couple other discussions on the topic:

Visual studio feature - commenting code Ctrl K - Ctrl C

visual studio C++ toggle comment ? comment while not whole line is selected?

Based on my own tinkerings, and what was said in those articles...

It's based on the start/end of the selection. It seems to use double slashes // whenever you start your selection at the beginning of the line AND end it at the end of a line.

It will use /* */ notation whenever the selection occurs midway through lines.

IE:

If I have the code

int main () {
    return 0;
}

and highlight only int main, it will convert it to /*int main*/.

If I highlight the entire code section, starting after the indent tab, it will convert it to

/*int main () {
    return 0;
}*/

But if I highlight the section starting before the indent tab, it converts it to

//int main () {
//    return 0;
//}

回答2:

Summary of links under Zhais' answer. Because following links is hard!

• Selecting entire lines (including leading whitespace) will use //
• Selecting at least one partial line
  • If a // comment is included, will use //
  • Otherwise, will use /* */

来源：https://stackoverflow.com/questions/5708571/why-does-vs-2010-comment-keyboard-shortcut-change-in-c