private FileStream TryCreateFileStream(bool allowConcurrentWrite)
{
FileShare fileShare = FileShare.Read;
if (allowConcurrentWrite)
{
fileShare = FileShare.ReadWrite;
}
#if !NET_CF
if (this.CreateFileParameters.EnableFileDelete && PlatformDetector.GetCurrentRuntimeOS() != RuntimeOS.Windows)
{
fileShare |= FileShare.Delete;
}
#endif
#if !NET_CF && !SILVERLIGHT
if (PlatformDetector.IsCurrentOSCompatibleWith(RuntimeOS.WindowsNT) ||
PlatformDetector.IsCurrentOSCompatibleWith(RuntimeOS.Windows))
{
return(this.WindowsCreateFile(this.FileName, allowConcurrentWrite));
}
#endif
return(new FileStream(
this.FileName,
FileMode.Append,
FileAccess.Write,
fileShare,
this.CreateFileParameters.BufferSize));
}
private FileStream WindowsCreateFile(string fileName, bool allowConcurrentWrite)
{
int fileShare = Win32FileNativeMethods.FILE_SHARE_READ;
if (allowConcurrentWrite)
{
fileShare |= Win32FileNativeMethods.FILE_SHARE_WRITE;
}
if (this.CreateFileParameters.EnableFileDelete && PlatformDetector.GetCurrentRuntimeOS() != RuntimeOS.Windows)
{
fileShare |= Win32FileNativeMethods.FILE_SHARE_DELETE;
}
IntPtr handle = Win32FileNativeMethods.CreateFile(
fileName,
Win32FileNativeMethods.FileAccess.GenericWrite,
fileShare,
IntPtr.Zero,
Win32FileNativeMethods.CreationDisposition.OpenAlways,
this.CreateFileParameters.FileAttributes,
IntPtr.Zero);
if (handle.ToInt32() == -1)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
var safeHandle = new Microsoft.Win32.SafeHandles.SafeFileHandle(handle, true);
var returnValue = new FileStream(safeHandle, FileAccess.Write, this.CreateFileParameters.BufferSize);
returnValue.Seek(0, SeekOrigin.End);
return(returnValue);
}
