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

不是答案，只是一个有用的补充: 作为免费赠品，我刚刚发明了(嗯……记得不能用调整由Lolo发布的代码)RemoveLineOrBlock宏。享受吧!

Imports System
Imports EnvDTE
Imports EnvDTE80
Imports EnvDTE90
Imports EnvDTE90a
Imports EnvDTE100
Imports System.Diagnostics

Public Module RemoveLineOrBlock

    Sub RemoveLineOrBlock()
        Dim selection As TextSelection = DTE.ActiveDocument.Selection
        Dim lineNumber As Integer
        Dim line As String

        If selection.IsEmpty Then
            selection.StartOfLine(0)
            selection.EndOfLine(True)
        Else
            Dim top As Integer = selection.TopLine
            Dim bottom As Integer = selection.BottomLine

            selection.MoveToDisplayColumn(top, 0)
            selection.StartOfLine(0)

            selection.MoveToDisplayColumn(bottom, 0, True)
            selection.EndOfLine(True)
        End If

        selection.LineDown(True)
        selection.StartOfLine(vsStartOfLineOptions.vsStartOfLineOptionsFirstColumn,True)

        selection.Delete()

        selection.MoveToDisplayColumn(selection.BottomLine, 0)
        selection.StartOfLine(vsStartOfLineOptions.vsStartOfLineOptionsFirstText)

    End Sub

End Module

在Visual Studio 2010中，你用CTRL + INSERT复制光标所在的整行，然后你可以用CTRL + V或SHIFT + INSERT粘贴它。

在Visual studio 2017或其他版本不需要宏或扩展，

进入“工具>选项>环境>键盘” 在显示命令下包含:写编辑。重复的 将光标置于“按快捷键:”，按“Ctrl + D”，单击“分配”按钮 单击OK保存新的键盘快捷方式

对于visual studio 2010，尝试使用这些命令来快速复制行(使用剪贴板):

单击要复制的行。 Ctrl + C将复制这一行。 然后按Ctrl + Shift + Enter在插入点下方插入空白 (或者使用Ctrl + Enter在插入点上方插入空行。) 然后简单地使用Ctrl + V粘贴行。

对于Visual Studio Code 2019:

使用ctrl+k和ctrl+s编辑菜单键盘快捷键

编辑“向下复制一行”(Shift + Alt + DownArrow)到你自己的快捷方式。

您可以通过命令ID: editor.action.copyLinesDownAction找到它

对我来说，ctrl+d