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Diffstat (limited to 'src/mscorlib/src/System/DBNull.cs')
-rw-r--r-- | src/mscorlib/src/System/DBNull.cs | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/DBNull.cs b/src/mscorlib/src/System/DBNull.cs new file mode 100644 index 0000000000..27ba8cfe13 --- /dev/null +++ b/src/mscorlib/src/System/DBNull.cs @@ -0,0 +1,121 @@ +// Copyright (c) Microsoft. All rights reserved. +// Licensed under the MIT license. See LICENSE file in the project root for full license information. + +//////////////////////////////////////////////////////////////////////////////// +// Void +// This class represents a Missing Variant +//////////////////////////////////////////////////////////////////////////////// +namespace System { + + using System; + using System.Runtime.Remoting; + using System.Runtime.Serialization; + using System.Security.Permissions; +[System.Runtime.InteropServices.ComVisible(true)] + [Serializable] + public sealed class DBNull : ISerializable, IConvertible { + + //Package private constructor + private DBNull(){ + } + + private DBNull(SerializationInfo info, StreamingContext context) { + throw new NotSupportedException(Environment.GetResourceString("NotSupported_DBNullSerial")); + } + + public static readonly DBNull Value = new DBNull(); + + [System.Security.SecurityCritical] + public void GetObjectData(SerializationInfo info, StreamingContext context) { + UnitySerializationHolder.GetUnitySerializationInfo(info, UnitySerializationHolder.NullUnity, null, null); + } + + public override String ToString() { + return String.Empty; + } + + public String ToString(IFormatProvider provider) { + return String.Empty; + } + + public TypeCode GetTypeCode() { + return TypeCode.DBNull; + } + + /// <internalonly/> + bool IConvertible.ToBoolean(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + char IConvertible.ToChar(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + sbyte IConvertible.ToSByte(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + byte IConvertible.ToByte(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + short IConvertible.ToInt16(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + ushort IConvertible.ToUInt16(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + int IConvertible.ToInt32(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + uint IConvertible.ToUInt32(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + long IConvertible.ToInt64(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + ulong IConvertible.ToUInt64(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + float IConvertible.ToSingle(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + double IConvertible.ToDouble(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + decimal IConvertible.ToDecimal(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + DateTime IConvertible.ToDateTime(IFormatProvider provider) { + throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); + } + + /// <internalonly/> + Object IConvertible.ToType(Type type, IFormatProvider provider) { + return Convert.DefaultToType((IConvertible)this, type, provider); + } + } +} + |