private static void SetIOPriority(Stream stream, PRIORITY_HINT priority)
{
FileStream fileStream = (FileStream)stream;
FieldInfo field = fileStream.GetType().GetField("_handle", BindingFlags.Instance | BindingFlags.NonPublic);
SafeHandle fileHandle = (SafeHandle)field.GetValue(fileStream);
FILE_IO_PRIORITY_HINT_INFO fi = new FILE_IO_PRIORITY_HINT_INFO();
fi.PriorityHint = priority;
bool reffed = false;
bool f = false;
int hrForLastWin32Error = 0;
try
{
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
fileHandle.DangerousAddRef(ref reffed);
}
f = SetFileInformationByHandle(fileHandle.DangerousGetHandle(), FILE_INFO_BY_HANDLE_CLASS.FileIoPriorityHintInfo, ref fi, Marshal.SizeOf(fi));
hrForLastWin32Error = Marshal.GetHRForLastWin32Error();
}
finally
{
if (reffed)
{
fileHandle.DangerousRelease();
}
}
if (!f)
{
Marshal.ThrowExceptionForHR(hrForLastWin32Error);
}
}
private static extern bool SetFileInformationByHandle(
IntPtr hFile,
FILE_INFO_BY_HANDLE_CLASS FileInformationClass,
[MarshalAs(UnmanagedType.Struct)] ref FILE_IO_PRIORITY_HINT_INFO lpFileInformation,
int dwBufferSize);
