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//
// System.DBNull.cs
//
// Authors:
// Duncan Mak (duncan@ximian.com)
// Ben Maurer (bmaurer@users.sourceforge.net)
//
// (C) 2002 Ximian, Inc. http://www.ximian.com
// (C) 2003 Ben Maurer
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Runtime.Serialization;
using System.Runtime.InteropServices;
namespace System
{
[Serializable]
#if NET_2_0
[ComVisible (true)]
#endif
public sealed class DBNull : ISerializable, IConvertible
{
// Fields
public static readonly DBNull Value = new DBNull ();
// Private constructor
private DBNull ()
{
}
private DBNull (SerializationInfo info, StreamingContext context)
{
throw new NotSupportedException ();
}
// Methods
public void GetObjectData (SerializationInfo info, StreamingContext context)
{
UnitySerializationHolder.GetDBNullData (this, info, context);
}
public TypeCode GetTypeCode ()
{
return TypeCode.DBNull;
}
bool IConvertible.ToBoolean (IFormatProvider provider)
{
throw new InvalidCastException ();
}
byte IConvertible.ToByte (IFormatProvider provider)
{
throw new InvalidCastException ();
}
char IConvertible.ToChar (IFormatProvider provider)
{
throw new InvalidCastException ();
}
DateTime IConvertible.ToDateTime (IFormatProvider provider)
{
throw new InvalidCastException ();
}
decimal IConvertible.ToDecimal (IFormatProvider provider)
{
throw new InvalidCastException ();
}
double IConvertible.ToDouble (IFormatProvider provider)
{
throw new InvalidCastException ();
}
short IConvertible.ToInt16 (IFormatProvider provider)
{
throw new InvalidCastException ();
}
int IConvertible.ToInt32 (IFormatProvider provider)
{
throw new InvalidCastException ();
}
long IConvertible.ToInt64 (IFormatProvider provider)
{
throw new InvalidCastException ();
}
#if ONLY_1_1
#pragma warning disable 3019
[CLSCompliant (false)]
#endif
sbyte IConvertible.ToSByte (IFormatProvider provider)
{
throw new InvalidCastException ();
}
#if ONLY_1_1
#pragma warning restore 3019
#endif
float IConvertible.ToSingle (IFormatProvider provider)
{
throw new InvalidCastException ();
}
object IConvertible.ToType (Type targetType, IFormatProvider provider)
{
if (targetType == typeof (string))
return String.Empty;
if (targetType == typeof (DBNull))
return this;
throw new InvalidCastException ();
}
#if ONLY_1_1
#pragma warning disable 3019
[CLSCompliant (false)]
#endif
ushort IConvertible.ToUInt16 (IFormatProvider provider)
{
throw new InvalidCastException ();
}
#if ONLY_1_1
#pragma warning restore 3019
#endif
#if ONLY_1_1
#pragma warning disable 3019
[CLSCompliant (false)]
#endif
uint IConvertible.ToUInt32 (IFormatProvider provider)
{
throw new InvalidCastException ();
}
#if ONLY_1_1
#pragma warning restore 3019
#endif
#if ONLY_1_1
#pragma warning disable 3019
[CLSCompliant (false)]
#endif
ulong IConvertible.ToUInt64 (IFormatProvider provider)
{
throw new InvalidCastException ();
}
#if ONLY_1_1
#pragma warning restore 3019
#endif
public override string ToString ()
{
return String.Empty;
}
public string ToString (IFormatProvider provider)
{
return String.Empty;
}
}
}
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