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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Runtime.Serialization;
namespace System
{
public sealed class DBNull : ISerializable, IConvertible
{
private DBNull()
{
}
public static readonly DBNull Value = new DBNull();
public void GetObjectData(SerializationInfo info, StreamingContext context)
{
throw new PlatformNotSupportedException();
}
public override string ToString()
{
return string.Empty;
}
public string ToString(IFormatProvider provider)
{
return string.Empty;
}
public TypeCode GetTypeCode()
{
return TypeCode.DBNull;
}
bool IConvertible.ToBoolean(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
char IConvertible.ToChar(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
sbyte IConvertible.ToSByte(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
byte IConvertible.ToByte(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
short IConvertible.ToInt16(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
ushort IConvertible.ToUInt16(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
int IConvertible.ToInt32(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
uint IConvertible.ToUInt32(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
long IConvertible.ToInt64(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
ulong IConvertible.ToUInt64(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
float IConvertible.ToSingle(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
double IConvertible.ToDouble(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
decimal IConvertible.ToDecimal(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
DateTime IConvertible.ToDateTime(IFormatProvider provider)
{
throw new InvalidCastException(SR.InvalidCast_FromDBNull);
}
object IConvertible.ToType(Type type, IFormatProvider provider)
{
return Convert.DefaultToType((IConvertible)this, type, provider);
}
}
}
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