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Asked: 2026-05-11T01:29:06+00:00

I have a WPF application using Aero Glass. When using the application under a

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I have a WPF application using Aero Glass. When using the application under a 120dpi setting the margins within my UI are not matching up to the margins I pass over to the DwmExtendFrameIntoClientArea API call.

How would I get the systems DPI setting within .NET 3.0 so that I can correct the margin that I am passing to the DwmExtendFrameIntoClientArea API call?

Essentially, the WPF UI uses device-independent units whereas the DwmExtendFrameIntoClientArea API call uses pixels.

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  1. Okay, something like the following will fix the issue:

    Public Shared Function GetDpiAdjustedMargins(ByVal WindowHandle As IntPtr, ByVal Left As Integer, ByVal Right As Integer, ByVal Top As Integer, ByVal Bottom As Integer) As Margins     '     Dim Graphics As System.Drawing.Graphics = System.Drawing.Graphics.FromHwnd(WindowHandle)     Dim DesktopDPIx As Single = Graphics.DpiX     Dim DesktopDPIy As Single = Graphics.DpiY      Dim Margins As Margins = New Margins     Margins.Left = Left * (DesktopDPIx / 96)     Margins.Right = Right * (DesktopDPIx / 96)     Margins.Top = Top * (DesktopDPIx / 96)     Margins.Bottom = Bottom * (DesktopDPIx / 96)     Return Margins     ' End Function

    Source: Pro WPF in C# 2008 By Matthew MacDonald

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