将开发从 100% 的 Windows 缩放转移到 150% 的 WinForms 窗口

Question

I use C# Winforms in Visual Studio 2010. Since I've upgraded my laptop from the old 1366 x 768 resolution laptop to a new laptop with a 1920x1080 resolution, I noticed a problem when continuing development on the new laptop. I isolated the issue down to the new 150% Windows OS-wide scaling (Windows on the old laptop used 100% scaling). When I run the program, the right side of the window is strangely chopped off.

Here's the working version on the old laptop (1000 pixels wide, or 1500 pixels in 150% scaled Windows mode):

And here's the new version on the new laptop with the chopped window (1286 pixels wide, when it should be 1500 due to the 150% scaling).

Upon immediately loading the project into the new 150% scaled Windows setup and running the program, it appears to work fine, but as soon as you move one of the buttons so that VS updates the designer code (button 5 was moved as you can see), and then run, the window is chopped.

Even when manually going into the Form1.Designer.cs code, and adjusting the ClientSize to a stupid high horizontal value like ClientSize = new System.Drawing.Size(3000, 709); results in a window width that is limited to 1286 pixels at most. (Not so) coincidentally, 1286 is around 1920 / 1.5.

Basically, what the heck is going on? This appears like a bug with VS's scaling management. To be clear, the problem occurs when moving development from a 100% Windows scaled screen to a 150% Windows scaled screen, on any system. You don't need two laptops to reproduce the problem, it can all be reproduced on a single laptop (but make sure you log out and into Windows after switching from/to 100% or 150%).

Finally, to be clear, I know about setting the DPI-aware setting to true using an app.manifest file. Although this allows clearer text and solves the chopped window problem, I do NOT want to go this route due to inconsistent changes in my program's GUI such as overlapping controls and misplaced items on some setups.

Answer 1

I've found two half-solutions so far:

First is upgrading to Visual Studio 2017 (which allows you to force 100% scaling in VS Forms designer even in 150% Windows scaling)

Second is keeping with an earlier version of Visual Studio (including VS 2010), but making sure Windows is set to 100% scaling. If you've only just changed the scaling setting, make sure to log out and in of Windows to ensure the scaling is applied appropriately.

Answer 2

A relatively simple workaround is to create a Panel Control that is the size you desire for the window, send it to the first layer (right click the control in the designer> send to back). Then set the form to AutoResize to fit that control. (also set AutoSizeMode to GrowAndShrink in case the form appears larger than it should)

This works great if you need Fixed forms but for Resizable forms you might want some extra code that resizes this panel when the form's resize event happens.