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
- OrthographicCamera.cs
- Line.cs
- TextServicesHost.cs
- SiteMapNodeItemEventArgs.cs
- LookupNode.cs
- SqlFactory.cs
- AndCondition.cs
- ProtocolsSection.cs
- XmlTypeAttribute.cs
- PropertyKey.cs
- Int16Converter.cs
- BrowserDefinitionCollection.cs
- DbProviderSpecificTypePropertyAttribute.cs
- ChangeProcessor.cs
- HandlerBase.cs
- StateBag.cs
- AssemblyCache.cs
- CompilerInfo.cs
- WindowPatternIdentifiers.cs
- LinkDescriptor.cs
- EffectiveValueEntry.cs
- DesignerActionItem.cs
- SqlProviderServices.cs
- ContractMapping.cs
- cookie.cs
- AppSettingsExpressionEditor.cs
- QilReference.cs
- VerificationAttribute.cs
- AuthorizationRuleCollection.cs
- DictionaryBase.cs
- DataSourceSelectArguments.cs
- MissingMemberException.cs
- DecimalConverter.cs
- DesignBindingValueUIHandler.cs
- CAGDesigner.cs
- Track.cs
- NativeMethods.cs
- PropertyGridEditorPart.cs
- GenericEnumerator.cs
- HierarchicalDataSourceControl.cs
- ScaleTransform.cs
- JsonQueryStringConverter.cs
- XsltArgumentList.cs
- MULTI_QI.cs
- ConfigDefinitionUpdates.cs
- FillErrorEventArgs.cs
- ConstrainedDataObject.cs
- EdmValidator.cs
- SqlNotificationEventArgs.cs
- MouseDevice.cs
- FontUnit.cs
- TextBoxLine.cs
- AbsoluteQuery.cs
- ReadWriteSpinLock.cs
- ChangeBlockUndoRecord.cs
- DisplayNameAttribute.cs
- TemplateAction.cs
- TextSelectionHelper.cs
- PerfProviderCollection.cs
- BlurEffect.cs
- Registration.cs
- CompositeActivityTypeDescriptor.cs
- Fx.cs
- JsonFormatGeneratorStatics.cs
- ObjectNotFoundException.cs
- CommonRemoteMemoryBlock.cs
- ImageMetadata.cs
- HealthMonitoringSection.cs
- ILGenerator.cs
- unsafenativemethodsother.cs
- DictionaryEntry.cs
- ClientSession.cs
- KeyboardNavigation.cs
- ApplicationException.cs
- IgnoreDataMemberAttribute.cs
- WeakReadOnlyCollection.cs
- ConvertEvent.cs
- PropertyChangingEventArgs.cs
- PropertyValueChangedEvent.cs
- WrapperEqualityComparer.cs
- ParentQuery.cs
- MetadataItemEmitter.cs
- MenuItem.cs
- SaveFileDialog.cs
- EntityDataSourceView.cs
- FocusWithinProperty.cs
- TransformerInfoCollection.cs
- ObjectComplexPropertyMapping.cs
- Stopwatch.cs
- ReflectionUtil.cs
- DictionaryBase.cs
- HiddenFieldPageStatePersister.cs
- LocatorPartList.cs
- Bookmark.cs
- OleDbWrapper.cs
- HuffmanTree.cs
- FactoryGenerator.cs
- GregorianCalendarHelper.cs
- CodeGeneratorAttribute.cs
- DataSvcMapFile.cs