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
- _StreamFramer.cs
- BooleanFunctions.cs
- MemberRelationshipService.cs
- ContentFilePart.cs
- PackUriHelper.cs
- Tile.cs
- EventSetter.cs
- EntityAdapter.cs
- PreservationFileWriter.cs
- HttpContextWrapper.cs
- HeaderUtility.cs
- ScopelessEnumAttribute.cs
- TextRunCache.cs
- TypeListConverter.cs
- BufferAllocator.cs
- HostingEnvironmentSection.cs
- IndentedWriter.cs
- GraphicsPath.cs
- Int32RectConverter.cs
- UniqueIdentifierService.cs
- FixedSOMPage.cs
- BigInt.cs
- MenuAutomationPeer.cs
- HttpHeaderCollection.cs
- TextUtf8RawTextWriter.cs
- RemotingSurrogateSelector.cs
- StorageEndPropertyMapping.cs
- IIS7WorkerRequest.cs
- Profiler.cs
- ModuleBuilderData.cs
- SchemaConstraints.cs
- _Semaphore.cs
- DataListItem.cs
- PerfService.cs
- ScrollBar.cs
- EventWaitHandle.cs
- StringBuilder.cs
- ServiceDesigner.cs
- SBCSCodePageEncoding.cs
- CodeExpressionStatement.cs
- documentsequencetextcontainer.cs
- ConfigXmlElement.cs
- DataGridViewColumnDesigner.cs
- AttributeCollection.cs
- QilInvokeEarlyBound.cs
- WebEventCodes.cs
- ToolStripContentPanel.cs
- ZeroOpNode.cs
- XPathExpr.cs
- ExtendedPropertyCollection.cs
- TdsParserHelperClasses.cs
- Types.cs
- CapabilitiesUse.cs
- ListBase.cs
- TouchesOverProperty.cs
- IntellisenseTextBox.designer.cs
- GridViewColumnHeaderAutomationPeer.cs
- ResourceReader.cs
- DependencyObjectCodeDomSerializer.cs
- XmlValueConverter.cs
- HtmlGenericControl.cs
- ListSortDescription.cs
- GradientBrush.cs
- ItemDragEvent.cs
- HtmlInputFile.cs
- RectAnimationUsingKeyFrames.cs
- AppSettingsReader.cs
- FrameworkContentElement.cs
- CellParaClient.cs
- MachineKeySection.cs
- OrderPreservingSpoolingTask.cs
- StringUtil.cs
- PropertyPanel.cs
- MaskedTextBox.cs
- MimeWriter.cs
- DataGridViewCellParsingEventArgs.cs
- Normalizer.cs
- ConnectionInterfaceCollection.cs
- RefreshEventArgs.cs
- SqlDeflator.cs
- DbConnectionInternal.cs
- Track.cs
- SectionUpdates.cs
- PathSegmentCollection.cs
- SoapFault.cs
- StylusDownEventArgs.cs
- DtcInterfaces.cs
- XPathNodeIterator.cs
- MetadataItemCollectionFactory.cs
- WebPartAuthorizationEventArgs.cs
- TCEAdapterGenerator.cs
- Thumb.cs
- Menu.cs
- PerformanceCounterPermission.cs
- PerfCounterSection.cs
- PageWrapper.cs
- OleDbSchemaGuid.cs
- HttpCookiesSection.cs
- EntityDataSourceChangedEventArgs.cs
- ConfigurationManagerInternal.cs