DBNull.cs

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using System.Runtime.Serialization;
 
namespace System;
 
[Serializable]
public sealed class DBNull : ISerializable, IConvertible
{
    public static readonly DBNull Value = new DBNull();
 
    private DBNull()
    {
    }
 
    private DBNull(SerializationInfo info, StreamingContext context)
    {
        throw new NotSupportedException(SR.NotSupported_DBNullSerial);
    }
 
    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        UnitySerializationHolder.GetUnitySerializationInfo(info, 2);
    }
 
    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(this, type, provider);
    }
}