OS version check without requiring app.manifest

Kinnara · Jul 28, 2020 · 2c27fba · 2c27fba
1 parent fd718cf
commit 2c27fba
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Showing 2 changed files with 38 additions and 4 deletions.
diff --git a/ModernWpf/Helpers/ColorsHelper.cs b/ModernWpf/Helpers/ColorsHelper.cs
@@ -1,10 +1,9 @@
-using ModernWpf.Media.ColorPalette;
-using System;
+using System;
 using System.Collections;
-using System.Diagnostics;
 using System.Runtime.CompilerServices;
 using System.Windows;
 using System.Windows.Media;
+using ModernWpf.Media.ColorPalette;
 using Windows.UI.ViewManagement;
 
 namespace ModernWpf
@@ -35,7 +34,7 @@ private ColorsHelper()
             }
         }
 
-        public static bool SystemColorsSupported { get; } = Environment.OSVersion.Version.Major >= 10;
+        public static bool SystemColorsSupported { get; } = OSVersionHelper.IsWindows10;
 
         public static ColorsHelper Current { get; } = new ColorsHelper();
 

diff --git a/ModernWpf/Helpers/OSVersionHelper.cs b/ModernWpf/Helpers/OSVersionHelper.cs
@@ -0,0 +1,35 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace ModernWpf
+{
+    internal static class OSVersionHelper
+    {
+        internal static bool IsWindowsNT { get; } = Environment.OSVersion.Platform == PlatformID.Win32NT;
+
+        internal static bool IsWindows10 { get; } = IsWindowsNT && IsWindows10Impl();
+
+        private static bool IsWindows10Impl()
+        {
+            var osv = new RTL_OSVERSIONINFOEX();
+            osv.dwOSVersionInfoSize = (uint)Marshal.SizeOf(osv);
+            int ret = RtlGetVersion(out osv);
+            return ret == 0 && osv.dwMajorVersion >= 10;
+        }
+
+        [DllImport("ntdll.dll")]
+        private static extern int RtlGetVersion(out RTL_OSVERSIONINFOEX lpVersionInformation);
+
+        [StructLayout(LayoutKind.Sequential)]
+        private struct RTL_OSVERSIONINFOEX
+        {
+            internal uint dwOSVersionInfoSize;
+            internal uint dwMajorVersion;
+            internal uint dwMinorVersion;
+            internal uint dwBuildNumber;
+            internal uint dwPlatformId;
+            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
+            internal string szCSDVersion;
+        }
+    }
+}