How to: View and Edit Code by Using Peek Definition (Alt+F12)


For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

You can use the Peek Definition command to view and edit code without switching away from the code that you're writing. Peek Definition and Go To Definition show the same information, but Peek Definition shows it in a pop-up window, and Go To Definition shows the code in a separate code window. Go To Definition causes your context (that is, the active code window, current line, and cursor position) to switch to the definition code window. By using Peek Definition, you can view and edit the definition and move around inside the definition file while keeping your place in the original code file.

You can use Peek Definition with C#, Visual Basic, and C++ code. In Visual Basic, Peek Definition shows a link to the Object Browser for symbols that don’t have definition metadata (for example, .NET Framework types that are built in).

System_CAPS_ICON_important.jpg Important

You can't use this command in any Express version of Visual Studio 2013.

To open a Peek Definition window

  1. You can find Peek Definition by opening the shortcut menu for a method that you want to explore. (Keyboard: Alt+F12)

    This illustration shows the Peek Definition window for a method that's named Print():

    Peek Window

    The definition window appears below the printer.Print(“Hello World!”) line in the original file. The window doesn't hide any of the code in your original file. The lines that follow the printer.Print(“Hello World!”) call appear under the definition window.

  2. You can move the cursor to different locations in the code definition window. You can still move around in the original code window above or below the definition window.

  3. You can copy a string from the definition window and paste it in the original code. You can also drag and drop the string from the definition window to the original code without deleting it from the definition window.

  4. You can close the definition window by choosing the Esc key or the Close button on the definition window tab.

To open a Peek Definition window from within a Peek Definition window

  • If you already have a Peek Definition window open, you can call Peek Definition again on the code in that window. Another definition window opens. A set of breadcrumb dots appears next to the definition window tab, which you can use to navigate between definition windows. The tooltip on each dot shows the file name and path of the definition file that the dot represents.

    Peek window within a Peek window

To use Peek Definition with multiple results

  • If you use Peek Definition on code that has more than one definition (for example, partial classes), a result list appears to the right of the code definition view. You can choose any result in the list to display its definition.

    Peek window from multiple results

To edit inside the Peek Definition window

  • When you start to edit inside a Peek Definition window, the file that you're modifying automatically opens as a separate tab in the code editor and reflects the changes that you've already made. You can continue to make, undo, and save changes in the Peek Definition window, and the tab will continue to reflect those changes. Even if you close the window without saving your changes, you can make, undo, and save more changes in the tab, picking up exactly where you left off in the window.

    Editing within a Peek window

To use keyboard shortcuts for Peek Definition

  • You can use these keyboard shortcuts with the Peek Definition window:

    FunctionalityKeyboard shortcut
    Open the definition windowAlt+F12
    Close the definition windowEsc
    Promote the definition window to a regular document tabShift+Alt+Home
    Navigate between definition windowsCtrl+Alt+- and Ctrl+Alt+=
    Navigate between multiple resultsF8 and Shift+F8
    Toggle between the code editor window and the definition windowShift+Esc
    System_CAPS_ICON_note.jpg Note

    You can also use the same keyboard shortcuts to edit code in a Peek Definition window as you use elsewhere in Visual Studio.

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