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Copyright (C) 2012 Jeroen Frijters
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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using System.Threading;
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using System.Runtime.InteropServices;
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using System.Security;
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sealed class ThemingActivationContext : IDisposable
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private IntPtr cookie;
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public ThemingActivationContext()
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if (Context.hActCtx != IntPtr.Zero)
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if (ActivateActCtx(Context.hActCtx, out tmp))
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[SecuritySafeCritical]
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IntPtr tmp = Interlocked.Exchange(ref cookie, IntPtr.Zero);
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if (tmp != IntPtr.Zero)
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DeactivateActCtx(0, tmp);
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internal static readonly IntPtr hActCtx;
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ACTCTX actctx = new ACTCTX();
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actctx.cbSize = Marshal.SizeOf(typeof(ACTCTX));
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actctx.lpSource = Path.Combine(RuntimeEnvironment.GetRuntimeDirectory(), "XPThemes.manifest");
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IntPtr handle = CreateActCtx(ref actctx);
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if (handle != new IntPtr(-1))
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internal uint dwFlags;
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internal string lpSource;
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internal ushort wProcessorArchitecture;
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internal ushort wLangId;
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internal string lpAssemblyDirectory;
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internal string lpResourceName;
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internal string lpApplicationName;
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[DllImport("kernel32.dll")]
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extern static IntPtr CreateActCtx(ref ACTCTX actctx);
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[DllImport("kernel32.dll")]
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extern static bool ActivateActCtx(IntPtr hActCtx, out IntPtr lpCookie);
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[DllImport("kernel32.dll")]
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extern static bool DeactivateActCtx(uint dwFlags, IntPtr lpCookie);