public static T Using <T>(string manifest, Func <T> action)
{
var context = new UnsafeNativeMethods.ACTCTX
{
cbSize = Marshal.SizeOf(typeof(UnsafeNativeMethods.ACTCTX)),
lpSource = manifest
};
if (context.cbSize != 0x20)
{
throw new Exception("ACTCTX.cbSize is wrong");
}
var hActCtx = UnsafeNativeMethods.CreateActCtx(ref context);
if (hActCtx == (IntPtr)(-1))
{
throw new Win32Exception();
}
try
{
var cookie = IntPtr.Zero;
if (!UnsafeNativeMethods.ActivateActCtx(hActCtx, out cookie))
{
throw new Win32Exception();
}
try
{
return(action());
}
finally
{
UnsafeNativeMethods.DeactivateActCtx(0, cookie);
}
}
finally
{
UnsafeNativeMethods.ReleaseActCtx(hActCtx);
}
}
static public void UsingManifestDo(string manifest, Action action)
{
UnsafeNativeMethods.ACTCTX context = new UnsafeNativeMethods.ACTCTX();
context.cbSize = Marshal.SizeOf(typeof(UnsafeNativeMethods.ACTCTX));
if (context.cbSize != 0x20)
{
throw new Exception("ACTCTX.cbSize is wrong");
}
context.lpSource = manifest;
IntPtr hActCtx = UnsafeNativeMethods.CreateActCtx(ref context);
if (hActCtx == (IntPtr)(-1))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
try // with valid hActCtx
{
IntPtr cookie = IntPtr.Zero;
if (!UnsafeNativeMethods.ActivateActCtx(hActCtx, out cookie))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
try // with activated context
{
action();
}
finally
{
UnsafeNativeMethods.DeactivateActCtx(0, cookie);
}
}
finally
{
UnsafeNativeMethods.ReleaseActCtx(hActCtx);
}
}