empty.cs

来自「没的 没的 没的 没的 没的 没的 没的 没的 没的 没的 没的 没的 没的 没」· CS 代码 · 共 60 行

/*
 * Empty.cs - Implementation of the "System.Private.Empty" class.
 *
 * Copyright (C) 2001, 2003  Southern Storm Software, Pty Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

namespace System.Private
{

using System.Runtime.Serialization;

// This class is used internally as a tag for null references.
internal sealed class Empty
#if CONFIG_SERIALIZATION
	: ISerializable
#endif
{

	// The only empty object in the system.
	public readonly static Empty Value = new Empty();

	// Constructors.
	private Empty() {}

	// Override inherited methods.
	public override String ToString()
			{
				return String.Empty;
			}

#if CONFIG_SERIALIZATION

	// Get the serialization data for this object.
	public void GetObjectData(SerializationInfo info, StreamingContext context)
			{
				UnitySerializationHolder.Serialize
					(info, UnitySerializationHolder.UnityType.Empty,
					 null, null);
			}

#endif

}; // class Empty

}; // namespace System.Private