private static bool EnsureActivateContextCreated()
{
lock (_contextCreationLock)
{
if (!_contextCreationSucceeded)
{
// Pull manifest from the .NET Framework install
// directory
string assemblyLoc = null;
assemblyLoc = typeof(Object).Assembly.Location;
string manifestLoc = null;
string installDir = null;
if (assemblyLoc != null)
{
installDir = Path.GetDirectoryName(assemblyLoc);
const string manifestName = "XPThemes.manifest";
manifestLoc = Path.Combine(installDir, manifestName);
}
if (manifestLoc != null && installDir != null)
{
_enableThemingActivationContext = new NativeMethods.ACTCTX();
_enableThemingActivationContext.cbSize = Marshal.SizeOf(typeof(NativeMethods.ACTCTX));
_enableThemingActivationContext.lpSource = manifestLoc;
// Set the lpAssemblyDirectory to the install
// directory to prevent Win32 Side by Side from
// looking for comctl32 in the application
// directory, which could cause a bogus dll to be
// placed there and open a security hole.
_enableThemingActivationContext.lpAssemblyDirectory = installDir;
_enableThemingActivationContext.dwFlags = NativeMethods.ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID;
// Note this will fail gracefully if file specified
// by manifestLoc doesn't exist.
_activationContext = NativeMethods.CreateActCtx(ref _enableThemingActivationContext);
_contextCreationSucceeded = !_activationContext.IsInvalid;
}
}
// If we return false, we'll try again on the next call into
// EnsureActivateContextCreated(), which is fine.
return(_contextCreationSucceeded);
}
}
public static extern bool ActivateActCtx(ActivationContextSafeHandle hActCtx, out IntPtr lpCookie);