/// <summary>
/// Initializes a new instance of the <see cref="System.IO.FileStream" /> class with the specified path, creation mode, read/write and sharing permission, the access other FileStreams can have to the same file, the buffer size, additional file options and the allocation size.
/// </summary>
/// <param name="path">A relative or absolute path for the file that the current <see cref="System.IO.FileStream" /> instance will encapsulate.</param>
/// <param name="options">An object that describes optional <see cref="System.IO.FileStream" /> parameters to use.</param>
/// <exception cref="T:System.ArgumentNullException"><paramref name="path" /> or <paramref name="options" /> is <see langword="null" />.</exception>
/// <exception cref="T:System.ArgumentException"><paramref name="path" /> is an empty string (""), contains only white space, or contains one or more invalid characters.
/// -or-
/// <paramref name="path" /> refers to a non-file device, such as <c>CON:</c>, <c>COM1:</c>, <c>LPT1:</c>, etc. in an NTFS environment.</exception>
/// <exception cref="T:System.NotSupportedException"><paramref name="path" /> refers to a non-file device, such as <c>CON:</c>, <c>COM1:</c>, <c>LPT1:</c>, etc. in a non-NTFS environment.</exception>
/// <exception cref="T:System.IO.FileNotFoundException">The file cannot be found, such as when <see cref="System.IO.FileStreamOptions.Mode" /> is <see langword="FileMode.Truncate" /> or <see langword="FileMode.Open" />, and the file specified by <paramref name="path" /> does not exist. The file must already exist in these modes.</exception>
/// <exception cref="T:System.IO.IOException">An I/O error, such as specifying <see langword="FileMode.CreateNew" /> when the file specified by <paramref name="path" /> already exists, occurred.
/// -or-
/// The stream has been closed.
/// -or-
/// The disk was full (when <see cref="System.IO.FileStreamOptions.PreallocationSize" /> was provided and <paramref name="path" /> was pointing to a regular file).
/// -or-
/// The file was too large (when <see cref="System.IO.FileStreamOptions.PreallocationSize" /> was provided and <paramref name="path" /> was pointing to a regular file).</exception>
/// <exception cref="T:System.Security.SecurityException">The caller does not have the required permission.</exception>
/// <exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid, such as being on an unmapped drive.</exception>
/// <exception cref="T:System.UnauthorizedAccessException">The <see cref="System.IO.FileStreamOptions.Access" /> requested is not permitted by the operating system for the specified <paramref name="path" />, such as when <see cref="System.IO.FileStreamOptions.Access" /> is <see cref="System.IO.FileAccess.Write" /> or <see cref="System.IO.FileAccess.ReadWrite" /> and the file or directory is set for read-only access.
/// -or-
/// <see cref="F:System.IO.FileOptions.Encrypted" /> is specified for <see cref="System.IO.FileStreamOptions.Options" /> , but file encryption is not supported on the current platform.</exception>
/// <exception cref="T:System.IO.PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length. </exception>
public FileStream(string path, FileStreamOptions options)
{
ArgumentException.ThrowIfNullOrEmpty(path);
ArgumentNullException.ThrowIfNull(options);
if ((options.Access & FileAccess.Read) != 0 && options.Mode == FileMode.Append)
{
throw new ArgumentException(SR.Argument_InvalidAppendMode, nameof(options));
}
else if ((options.Access & FileAccess.Write) == 0)
{
if (options.Mode == FileMode.Truncate || options.Mode == FileMode.CreateNew || options.Mode == FileMode.Create || options.Mode == FileMode.Append)
{
throw new ArgumentException(SR.Format(SR.Argument_InvalidFileModeAndAccessCombo, options.Mode, options.Access), nameof(options));
}
}
if (options.PreallocationSize > 0)
{
FileStreamHelpers.ValidateArgumentsForPreallocation(options.Mode, options.Access);
}
if (options.UnixCreateMode.HasValue)
{
// Only allow UnixCreateMode for file modes that can create a new file.
if (options.Mode == FileMode.Truncate || options.Mode == FileMode.Open)
{
throw new ArgumentException(SR.Argument_InvalidUnixCreateMode, nameof(options));
}
}
FileStreamHelpers.SerializationGuard(options.Access);
_strategy = FileStreamHelpers.ChooseStrategy(
this, path, options.Mode, options.Access, options.Share, options.BufferSize, options.Options, options.PreallocationSize, options.UnixCreateMode);
}
/// <summary>
/// Initializes a new instance of the <see cref="System.IO.FileStream" /> class with the specified path, creation mode, read/write and sharing permission, the access other FileStreams can have to the same file, the buffer size, additional file options and the allocation size.
/// </summary>
/// <param name="path">A relative or absolute path for the file that the current <see cref="System.IO.FileStream" /> instance will encapsulate.</param>
/// <param name="options">An object that describes optional <see cref="System.IO.FileStream" /> parameters to use.</param>
/// <exception cref="T:System.ArgumentNullException"><paramref name="path" /> or <paramref name="options" /> is <see langword="null" />.</exception>
/// <exception cref="T:System.ArgumentException"><paramref name="path" /> is an empty string (""), contains only white space, or contains one or more invalid characters.
/// -or-
/// <paramref name="path" /> refers to a non-file device, such as <c>CON:</c>, <c>COM1:</c>, <c>LPT1:</c>, etc. in an NTFS environment.</exception>
/// <exception cref="T:System.NotSupportedException"><paramref name="path" /> refers to a non-file device, such as <c>CON:</c>, <c>COM1:</c>, <c>LPT1:</c>, etc. in a non-NTFS environment.</exception>
/// <exception cref="T:System.IO.FileNotFoundException">The file cannot be found, such as when <see cref="System.IO.FileStreamOptions.Mode" /> is <see langword="FileMode.Truncate" /> or <see langword="FileMode.Open" />, and the file specified by <paramref name="path" /> does not exist. The file must already exist in these modes.</exception>
/// <exception cref="T:System.IO.IOException">An I/O error, such as specifying <see langword="FileMode.CreateNew" /> when the file specified by <paramref name="path" /> already exists, occurred.
/// -or-
/// The stream has been closed.
/// -or-
/// The disk was full (when <see cref="System.IO.FileStreamOptions.PreallocationSize" /> was provided and <paramref name="path" /> was pointing to a regular file).
/// -or-
/// The file was too large (when <see cref="System.IO.FileStreamOptions.PreallocationSize" /> was provided and <paramref name="path" /> was pointing to a regular file).</exception>
/// <exception cref="T:System.Security.SecurityException">The caller does not have the required permission.</exception>
/// <exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid, such as being on an unmapped drive.</exception>
/// <exception cref="T:System.UnauthorizedAccessException">The <see cref="System.IO.FileStreamOptions.Access" /> requested is not permitted by the operating system for the specified <paramref name="path" />, such as when <see cref="System.IO.FileStreamOptions.Access" /> is <see cref="System.IO.FileAccess.Write" /> or <see cref="System.IO.FileAccess.ReadWrite" /> and the file or directory is set for read-only access.
/// -or-
/// <see cref="F:System.IO.FileOptions.Encrypted" /> is specified for <see cref="System.IO.FileStreamOptions.Options" /> , but file encryption is not supported on the current platform.</exception>
/// <exception cref="T:System.IO.PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length. </exception>
public FileStream(string path, FileStreamOptions options)
{
if (path is null)
{
throw new ArgumentNullException(nameof(path), SR.ArgumentNull_Path);
}
else if (path.Length == 0)
{
throw new ArgumentException(SR.Argument_EmptyPath, nameof(path));
}
else if (options is null)
{
throw new ArgumentNullException(nameof(options));
}
else if ((options.Access & FileAccess.Read) != 0 && options.Mode == FileMode.Append)
{
throw new ArgumentException(SR.Argument_InvalidAppendMode, nameof(options));
}
else if ((options.Access & FileAccess.Write) == 0)
{
if (options.Mode == FileMode.Truncate || options.Mode == FileMode.CreateNew || options.Mode == FileMode.Create || options.Mode == FileMode.Append)
{
throw new ArgumentException(SR.Format(SR.Argument_InvalidFileModeAndAccessCombo, options.Mode, options.Access), nameof(options));
}
}
FileStreamHelpers.SerializationGuard(options.Access);
_strategy = FileStreamHelpers.ChooseStrategy(
this, path, options.Mode, options.Access, options.Share, options.BufferSize, options.Options, options.PreallocationSize);
}