Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / clr / src / BCL / System / Nullable.cs / 1 / Nullable.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== using System; namespace System { using System.Globalization; using System.Reflection; using System.Collections.Generic; using System.Runtime.CompilerServices; using System.Security; // Warning, don't put System.Runtime.Serialization.On*Serializ*Attribute // on this class without first fixing ObjectClone::InvokeVtsCallbacks // Also, because we have special type system support that says a a boxed Nullable// can be used where a boxed is use, Nullable can not implement any intefaces // at all (since T may not). Do NOT add any interfaces to Nullable! // [TypeDependencyAttribute("System.Collections.Generic.NullableComparer`1")] [TypeDependencyAttribute("System.Collections.Generic.NullableEqualityComparer`1")] [Serializable()] public struct Nullable where T : struct { private bool hasValue; internal T value; public Nullable(T value) { this.value = value; this.hasValue = true; } public bool HasValue { get { return hasValue; } } public T Value { get { if (!HasValue) { ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NoValue); } return value; } } public T GetValueOrDefault() { return value; } public T GetValueOrDefault(T defaultValue) { return HasValue ? value : defaultValue; } public override bool Equals(object other) { if (!HasValue) return other == null; if (other == null) return false; return value.Equals(other); } public override int GetHashCode() { return HasValue ? value.GetHashCode() : 0; } public override string ToString() { return HasValue ? value.ToString() : ""; } public static implicit operator Nullable (T value) { return new Nullable (value); } public static explicit operator T(Nullable value) { return value.Value; } // The following already obsoleted methods were removed: // public int CompareTo(object other) // public int CompareTo(Nullable other) // public bool Equals(Nullable other) // public static Nullable FromObject(object value) // public object ToObject() // public string ToString(string format) // public string ToString(IFormatProvider provider) // public string ToString(string format, IFormatProvider provider) // The following newly obsoleted methods were removed: // string IFormattable.ToString(string format, IFormatProvider provider) // int IComparable.CompareTo(object other) // int IComparable >.CompareTo(Nullable other) // bool IEquatable >.Equals(Nullable other) } [System.Runtime.InteropServices.ComVisible(true)] public static class Nullable { [System.Runtime.InteropServices.ComVisible(true)] public static int Compare (Nullable n1, Nullable n2) where T : struct { if (n1.HasValue) { if (n2.HasValue) return Comparer .Default.Compare(n1.value, n2.value); return 1; } if (n2.HasValue) return -1; return 0; } [System.Runtime.InteropServices.ComVisible(true)] public static bool Equals (Nullable n1, Nullable n2) where T : struct { if (n1.HasValue) { if (n2.HasValue) return EqualityComparer .Default.Equals(n1.value, n2.value); return false; } if (n2.HasValue) return false; return true; } // If the type provided is not a Nullable Type, return null. // Otherwise, returns the underlying type of the Nullable type public static Type GetUnderlyingType(Type nullableType) { if( nullableType == null) { throw new ArgumentNullException("nullableType"); } Type result = null; if( nullableType.IsGenericType && !nullableType.IsGenericTypeDefinition) { // instantiated generic type only Type genericType = nullableType.GetGenericTypeDefinition(); if( genericType == typeof(Nullable<>)) { result = nullableType.GetGenericArguments()[0]; } } return result; } // The following already obsoleted methods were removed: // public static bool HasValue (Nullable value) // public static T GetValueOrDefault (Nullable value) // public static T GetValueOrDefault (Nullable value, T valueWhenNull) // The following newly obsoleted methods were removed: // public static Nullable FromObject (object value) // public static object ToObject (Nullable value) // public static object Wrap(object value, Type type) // public static object Unwrap(object value) } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== using System; namespace System { using System.Globalization; using System.Reflection; using System.Collections.Generic; using System.Runtime.CompilerServices; using System.Security; // Warning, don't put System.Runtime.Serialization.On*Serializ*Attribute // on this class without first fixing ObjectClone::InvokeVtsCallbacks // Also, because we have special type system support that says a a boxed Nullable // can be used where a boxed is use, Nullable can not implement any intefaces // at all (since T may not). Do NOT add any interfaces to Nullable! // [TypeDependencyAttribute("System.Collections.Generic.NullableComparer`1")] [TypeDependencyAttribute("System.Collections.Generic.NullableEqualityComparer`1")] [Serializable()] public struct Nullable where T : struct { private bool hasValue; internal T value; public Nullable(T value) { this.value = value; this.hasValue = true; } public bool HasValue { get { return hasValue; } } public T Value { get { if (!HasValue) { ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NoValue); } return value; } } public T GetValueOrDefault() { return value; } public T GetValueOrDefault(T defaultValue) { return HasValue ? value : defaultValue; } public override bool Equals(object other) { if (!HasValue) return other == null; if (other == null) return false; return value.Equals(other); } public override int GetHashCode() { return HasValue ? value.GetHashCode() : 0; } public override string ToString() { return HasValue ? value.ToString() : ""; } public static implicit operator Nullable (T value) { return new Nullable (value); } public static explicit operator T(Nullable value) { return value.Value; } // The following already obsoleted methods were removed: // public int CompareTo(object other) // public int CompareTo(Nullable other) // public bool Equals(Nullable other) // public static Nullable FromObject(object value) // public object ToObject() // public string ToString(string format) // public string ToString(IFormatProvider provider) // public string ToString(string format, IFormatProvider provider) // The following newly obsoleted methods were removed: // string IFormattable.ToString(string format, IFormatProvider provider) // int IComparable.CompareTo(object other) // int IComparable >.CompareTo(Nullable other) // bool IEquatable >.Equals(Nullable other) } [System.Runtime.InteropServices.ComVisible(true)] public static class Nullable { [System.Runtime.InteropServices.ComVisible(true)] public static int Compare (Nullable n1, Nullable n2) where T : struct { if (n1.HasValue) { if (n2.HasValue) return Comparer .Default.Compare(n1.value, n2.value); return 1; } if (n2.HasValue) return -1; return 0; } [System.Runtime.InteropServices.ComVisible(true)] public static bool Equals (Nullable n1, Nullable n2) where T : struct { if (n1.HasValue) { if (n2.HasValue) return EqualityComparer .Default.Equals(n1.value, n2.value); return false; } if (n2.HasValue) return false; return true; } // If the type provided is not a Nullable Type, return null. // Otherwise, returns the underlying type of the Nullable type public static Type GetUnderlyingType(Type nullableType) { if( nullableType == null) { throw new ArgumentNullException("nullableType"); } Type result = null; if( nullableType.IsGenericType && !nullableType.IsGenericTypeDefinition) { // instantiated generic type only Type genericType = nullableType.GetGenericTypeDefinition(); if( genericType == typeof(Nullable<>)) { result = nullableType.GetGenericArguments()[0]; } } return result; } // The following already obsoleted methods were removed: // public static bool HasValue (Nullable value) // public static T GetValueOrDefault (Nullable value) // public static T GetValueOrDefault (Nullable value, T valueWhenNull) // The following newly obsoleted methods were removed: // public static Nullable FromObject (object value) // public static object ToObject (Nullable value) // public static object Wrap(object value, Type type) // public static object Unwrap(object value) } } // 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
- Trace.cs
- TextMetrics.cs
- KeyboardInputProviderAcquireFocusEventArgs.cs
- MetadataArtifactLoader.cs
- coordinatorfactory.cs
- FontWeight.cs
- ValueTable.cs
- ComplexLine.cs
- WebPartConnectionCollection.cs
- NativeMethods.cs
- WebPartMenu.cs
- DefaultProxySection.cs
- ContractMapping.cs
- SystemWebExtensionsSectionGroup.cs
- ServerTooBusyException.cs
- AnimationClockResource.cs
- SR.cs
- CancellationTokenRegistration.cs
- Point3D.cs
- IgnorePropertiesAttribute.cs
- FixedSOMTableCell.cs
- SvcMapFileSerializer.cs
- DbSourceCommand.cs
- SafeBuffer.cs
- TableCellCollection.cs
- FilterUserControlBase.cs
- PointCollection.cs
- TraceUtility.cs
- PersonalizationEntry.cs
- SqlStream.cs
- IntegerFacetDescriptionElement.cs
- CodeDOMProvider.cs
- DragDrop.cs
- Window.cs
- WindowsListViewItemStartMenu.cs
- ToolStripRenderer.cs
- GroupQuery.cs
- ScopelessEnumAttribute.cs
- InlineObject.cs
- _AutoWebProxyScriptWrapper.cs
- RangeContentEnumerator.cs
- AttributeEmitter.cs
- SecurityPolicySection.cs
- MappedMetaModel.cs
- CodeTypeDeclarationCollection.cs
- WebPartTransformerCollection.cs
- CssClassPropertyAttribute.cs
- SystemWebExtensionsSectionGroup.cs
- Model3DGroup.cs
- PrivateFontCollection.cs
- OneToOneMappingSerializer.cs
- XPathDocumentNavigator.cs
- DbModificationClause.cs
- SystemIPInterfaceProperties.cs
- ConnectionPoint.cs
- TraceSource.cs
- AssemblyHash.cs
- RequestCacheEntry.cs
- EntityContainer.cs
- TextContainerHelper.cs
- AccessedThroughPropertyAttribute.cs
- WorkerRequest.cs
- RequestSecurityTokenResponse.cs
- DataSourceXmlAttributeAttribute.cs
- EventQueueState.cs
- TextReader.cs
- CancellationToken.cs
- Input.cs
- SqlUserDefinedAggregateAttribute.cs
- OletxResourceManager.cs
- BitmapSource.cs
- SessionPageStatePersister.cs
- ObjectHandle.cs
- CodeRegionDirective.cs
- ExpressionBuilderContext.cs
- TemplateLookupAction.cs
- MetadataProperty.cs
- SafeRightsManagementQueryHandle.cs
- ApplicationManager.cs
- ListMarkerLine.cs
- CqlWriter.cs
- WsdlServiceChannelBuilder.cs
- KeyedCollection.cs
- SqlFlattener.cs
- TypeConverterAttribute.cs
- DoubleLink.cs
- NativeMethodsOther.cs
- EntityKeyElement.cs
- AvTrace.cs
- FixedSOMGroup.cs
- CardSpaceException.cs
- CodeChecksumPragma.cs
- AxWrapperGen.cs
- UnsafeCollabNativeMethods.cs
- DynamicRendererThreadManager.cs
- PreApplicationStartMethodAttribute.cs
- SortAction.cs
- CodeStatement.cs
- Cursors.cs
- PointUtil.cs