把你的鼠标放在一行复制，然后按CTRL+C，然后按CTRL+V在同一行。 就像魔法一样:-)

由于我不能在我的Visual Studio 2013中使用宏，我找到了一个Visual Studio插件(我在2012年和2013年使用它)。 重复选择重复选择和整行-他们只需要部分选择。标准快捷键是ALT + D。

为什么要用这么长的方法来完成这么简单的事情?它需要不到一分钟的时间从微软下载和安装扩展。该页面说它将默认绑定到ALT+D，但对我来说，它在Visual Studio Community 2015中自动绑定到CTRL+D，没有任何更改。

这里是从Microsoft.com下载扩展的链接。

VS 2017的Ctrl + D或Ctrl + C;Ctrl + V 他们都为我工作。

Ctrl + D为我工作在VS2012与Resharper。这是Resharper的热键。

I use application link:AutoHotkey with below code saved in CommentDuplikateSaveClipboard.ahk file. You can edit/remove shortcuts it is easy. I have link to this file "Shortcut to CommentDuplikateSaveClipboard.ahk" in Autostart in windows. This script protect your clipboard. If you are more curious you would add shortcuts to thisable/enable script. I sometimes use very impressive Multi Clipboard script to easy handle with many clips saved on disk and use with CTRL+C,X,V to copy,paste,cut,next,previous,delete this,delete all.

;CommentDuplikateSaveClipboard.ahk

!c:: ; Alt+C === Duplicate Line
^d:: ; Ctrl+D
ClipSaved := ClipboardAll
Send, {END}{SHIFTDOWN}{HOME}{SHIFTUP}{CTRLDOWN}c{CTRLUP}{END}{ENTER}{CTRLDOWN}v{CTRLUP}{HOME}
Clipboard := ClipSaved
ClipSaved =
return

!x:: ; Alt+X === Comment Duplicate Line
ClipSaved := ClipboardAll
Send, {END}{SHIFTDOWN}{HOME}{SHIFTUP}{CTRLDOWN}c{CTRLUP}{LEFT}//{END}{ENTER}{CTRLDOWN}v{CTRLUP}{HOME}
Clipboard := ClipSaved
ClipSaved =
return

!z:: ; Alt+Z === Del uncomment  Line
ClipSaved := ClipboardAll
Send, {END}{SHIFTDOWN}{UP}{END}{SHIFTUP}{DEL}{HOME}{DEL}{DEL}
Clipboard := ClipSaved
ClipSaved =
return

!d:: ; Alt+D === Delete line
Send, {END}{SHIFTDOWN}{UP}{END}{SHIFTUP}{DEL}
return

!s:: ; Alt+S === Swap lines
ClipSaved := ClipboardAll
Send, {END}{SHIFTDOWN}{UP}{END}{SHIFTUP}{CTRLDOWN}x{CTRLUP}{UP}{END}{CTRLDOWN}v{CTRLUP}{HOME}
Clipboard := ClipSaved
ClipSaved =
return

!a:: ; Alt+A === Comment this line, uncomment above
Send, {END}{HOME}//{UP}{HOME}{DEL}{DEL}
return