Get Windows 10 Text Scaling value in WPF

Question

How can I programmatically retrieve text scaling value of Windows in WPF?

Why do you need to get it? Shouldn't WPF take care of it for you? https://stackoverflow.com/questions/9373260/detect-windows-font-size-100-125-and-150 — gunr2171, Aug 18 '21 at 12:20
I need this value @gunr2171, I believe it's possible in UWP, unfortunatelly I need it for WPF and I can't find a way to get it. — Themelis, Aug 18 '21 at 12:30

score 2 · Answer 1 · answered Aug 18 '21 at 13:58

2

Depending on whether you target .NET 5 or an earlier version, you should either set the TargetFramework to net5.0-windows10.0.* or install the Microsoft.Windows.SDK.Contracts NuGet package as described here.

You can then use the Windows.UI.ViewManagement.UISettings.TextScaleFactor property:

double factor = new UISettings().TextScaleFactor;

answered Aug 18 '21 at 13:58

mm8

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I am using `.NET Framework 4.7.2`, I have installed `Microsoft.Windows.SDK.Contracts` but the `Windows.UI.ViewManagement` namespace is not included( only `Windows.UI.Xaml` – Themelis Aug 18 '21 at 14:28
It does not, there's an error that says *must use `PackageReference`*, in the `Microsoft.Windows.SDK.Contracts.targets`. Is this about adding a reference of the nuget package to my project? – Themelis Aug 18 '21 at 14:32
Content of `Microsoft.Windows.SDK.Contracts.targets` file. ` ` That's all I am getting – Themelis Aug 18 '21 at 14:35
Did you change the format of your `.csproj` file? – mm8 Aug 18 '21 at 14:35
Ok there's a link there! – Themelis Aug 18 '21 at 14:37
I've restored the nuget packages of my solution, but the same error appears. Isn't that supposed to be a trivial operation? – Themelis Aug 18 '21 at 14:40
Yes, assuming you are using the modern project format. Apparently you (still) don't. – mm8 Aug 18 '21 at 14:41
As you've figgured out I have no clue if I am using the modern or the old one. I've pasted my `.csproject` file. Is that the old one? – Themelis Aug 18 '21 at 14:45
A thousand thanks, can't say that I wasn't panicked for a bit! – Themelis Aug 18 '21 at 14:56
Is `Windows.UI` UWP territory? – Themelis Aug 18 '21 at 15:15

Themelis · Accepted Answer · 2022-06-28T12:59:41.823

1

Windows 10

I've found a way to retrieve the Text Scaling Factor, without installing any Nuget packages. The idea is to obtain the value directly from the registry.

var userKey = Microsoft.Win32.Registry.CurrentUser;
var softKey = userKey.OpenSubKey("Software");
var micKey = softKey.OpenSubKey("Microsoft");
var accKey = micKey.OpenSubKey("Accessibility");

var factor = accKey.GetValue("TextScaleFactor");`

edited Jun 28 '22 at 12:59

answered Aug 19 '21 at 10:47

Themelis

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I don't know if this is a Windows 11 problem, but factor returned `null` for me. – Victor Chelaru Jun 18 '22 at 16:28
That worked for windows 10 @VictorChelaru – Themelis Jun 28 '22 at 12:59

Get Windows 10 Text Scaling value in WPF

2 Answers2

Windows 10