Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / DBNull.cs / 1305376 / DBNull.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //////////////////////////////////////////////////////////////////////////////// // 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; } ///bool IConvertible.ToBoolean(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// char IConvertible.ToChar(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// sbyte IConvertible.ToSByte(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// byte IConvertible.ToByte(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// short IConvertible.ToInt16(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// ushort IConvertible.ToUInt16(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// int IConvertible.ToInt32(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// uint IConvertible.ToUInt32(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// long IConvertible.ToInt64(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// ulong IConvertible.ToUInt64(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// float IConvertible.ToSingle(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// double IConvertible.ToDouble(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// decimal IConvertible.ToDecimal(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// DateTime IConvertible.ToDateTime(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); } /// Object IConvertible.ToType(Type type, IFormatProvider provider) { return Convert.DefaultToType((IConvertible)this, type, provider); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DataObjectAttribute.cs
- EventSourceCreationData.cs
- BamlBinaryReader.cs
- TimelineGroup.cs
- MenuItemAutomationPeer.cs
- SctClaimDictionary.cs
- SelectionProviderWrapper.cs
- panel.cs
- XmlNavigatorFilter.cs
- GlyphRun.cs
- XpsSerializerFactory.cs
- StructuralObject.cs
- ToolStripLabel.cs
- OleDbTransaction.cs
- NotificationContext.cs
- TemplatedWizardStep.cs
- QueryContinueDragEventArgs.cs
- OperationValidationEventArgs.cs
- FontStyleConverter.cs
- StreamGeometry.cs
- OracleParameterBinding.cs
- ToolStripRendererSwitcher.cs
- StringBlob.cs
- RuleSetDialog.cs
- PeerToPeerException.cs
- UInt64Storage.cs
- VersionConverter.cs
- SerialErrors.cs
- StylusPoint.cs
- MemoryPressure.cs
- Tablet.cs
- AssociationType.cs
- OptimizedTemplateContent.cs
- ProfileProvider.cs
- UniqueEventHelper.cs
- ModelUIElement3D.cs
- DecoderReplacementFallback.cs
- ManagementObjectSearcher.cs
- AssemblyAttributesGoHere.cs
- DbConnectionPoolGroup.cs
- EventMemberCodeDomSerializer.cs
- SecurityContext.cs
- SevenBitStream.cs
- Types.cs
- DateTimeFormatInfo.cs
- DesignObjectWrapper.cs
- StrokeCollectionDefaultValueFactory.cs
- Clock.cs
- PreviewPrintController.cs
- ConcatQueryOperator.cs
- xml.cs
- VerificationAttribute.cs
- cache.cs
- TypeInfo.cs
- XmlIterators.cs
- RsaSecurityKey.cs
- ConsumerConnectionPoint.cs
- VirtualDirectoryMapping.cs
- BitmapCacheBrush.cs
- QueryableDataSourceView.cs
- PropertyValueUIItem.cs
- ProcessModelInfo.cs
- PrivacyNoticeElement.cs
- CfgParser.cs
- GetCryptoTransformRequest.cs
- SiteMapNode.cs
- WebScriptEndpoint.cs
- DocumentPaginator.cs
- DragEvent.cs
- HuffCodec.cs
- ReadOnlyMetadataCollection.cs
- IndependentAnimationStorage.cs
- ColorConvertedBitmap.cs
- DataGridView.cs
- ImageList.cs
- Matrix.cs
- TextWriter.cs
- RadioButtonAutomationPeer.cs
- InkPresenterAutomationPeer.cs
- ConstNode.cs
- _ChunkParse.cs
- DragCompletedEventArgs.cs
- WorkflowView.cs
- VideoDrawing.cs
- BitmapImage.cs
- SmiRequestExecutor.cs
- PropertiesTab.cs
- COM2Enum.cs
- AdapterUtil.cs
- NonSerializedAttribute.cs
- ExceptionUtil.cs
- AlphabeticalEnumConverter.cs
- SQLDecimalStorage.cs
- SByteConverter.cs
- ExpressionQuoter.cs
- SelectionChangedEventArgs.cs
- Utility.cs
- TraceUtils.cs
- SearchForVirtualItemEventArgs.cs
- PkcsUtils.cs