58 lines
2.3 KiB
C#
58 lines
2.3 KiB
C#
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using System.ComponentModel;
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using System.Security;
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using System.Security.Permissions;
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using System.Security.Principal;
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using Microsoft.Win32;
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using Microsoft.Win32.SafeHandles;
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namespace System
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{
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internal static class EnvironmentHelpers
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{
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private static volatile bool s_IsAppContainerProcess;
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private static volatile bool s_IsAppContainerProcessInitalized;
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public static bool IsAppContainerProcess {
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get {
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if(!s_IsAppContainerProcessInitalized) {
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if(Environment.OSVersion.Platform != PlatformID.Win32NT) {
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s_IsAppContainerProcess = false;
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} else if(Environment.OSVersion.Version.Major < 6 || (Environment.OSVersion.Version.Major == 6 && Environment.OSVersion.Version.Minor <= 1)) {
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// Windows 7 or older.
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s_IsAppContainerProcess = false;
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} else {
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s_IsAppContainerProcess = HasAppContainerToken();
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}
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s_IsAppContainerProcessInitalized = true;
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}
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return s_IsAppContainerProcess;
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}
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}
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[SecuritySafeCritical]
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[SecurityPermission(SecurityAction.Assert, Flags = SecurityPermissionFlag.UnmanagedCode | SecurityPermissionFlag.ControlPrincipal)]
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private static unsafe bool HasAppContainerToken() {
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int* dwIsAppContainerPtr = stackalloc int[1];
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uint dwLength = 0;
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using (WindowsIdentity wi = WindowsIdentity.GetCurrent(TokenAccessLevels.Query)) {
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if (!UnsafeNativeMethods.GetTokenInformation(wi.Token, UnsafeNativeMethods.TokenIsAppContainer, new IntPtr(dwIsAppContainerPtr), sizeof(int), out dwLength)) {
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throw new Win32Exception();
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}
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}
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return (*dwIsAppContainerPtr != 0);
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}
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internal static bool IsWindowsVistaOrAbove()
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{
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// Method should match the logic of the internal Environment.IsWindowsVista property in mscorlib
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// If this method turns out to be heavily used we might want to cache at least part of this value.
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OperatingSystem os = Environment.OSVersion;
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return os.Platform == PlatformID.Win32NT && os.Version.Major >= 6;
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}
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}
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}
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