Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataEntity / System / Data / Objects / FieldDescriptor.cs / 1 / FieldDescriptor.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Data.Common; using System.Data.Objects.DataClasses; using System.Data.Metadata.Edm; namespace System.Data.Objects { internal sealed class FieldDescriptor : PropertyDescriptor { private readonly EdmProperty _property; private readonly Type _fieldType; private readonly Type _componentType; private readonly bool _isReadOnly; ////// Construct a new instance of the FieldDescriptor class that describes a property /// on components of the supplied type. /// /// Type of object whose property is described by this FieldDescriptor. /// /// True if property value on component can be modified; otherwise false. /// /// /// EdmProperty that describes the property on the component. /// internal FieldDescriptor(Type componentType, bool isReadOnly, EdmProperty property) : base(property.Name, null) { _componentType = componentType; _property = property; _isReadOnly = isReadOnly; _fieldType = DetermineClrType(_property.TypeUsage); System.Diagnostics.Debug.Assert(_fieldType != null, "FieldDescriptor's CLR type has unexpected value of null."); } ////// Determine a CLR Type to use a property descriptro form an EDM TypeUsage /// /// The EDM TypeUsage containing metadata about the type ///A CLR type that represents that EDM type private Type DetermineClrType(TypeUsage typeUsage) { Type result = null; EdmType edmType = typeUsage.EdmType; switch (edmType.BuiltInTypeKind) { case BuiltInTypeKind.EntityType: case BuiltInTypeKind.ComplexType: result = edmType.ClrType; break; case BuiltInTypeKind.RefType: result = typeof(EntityKey); break; case BuiltInTypeKind.CollectionType: TypeUsage elementTypeUse = ((CollectionType)edmType).TypeUsage; result = DetermineClrType(elementTypeUse); result = typeof(IEnumerable<>).MakeGenericType(result); break; case BuiltInTypeKind.PrimitiveType: result = edmType.ClrType; Facet nullable; if (result.IsValueType && typeUsage.Facets.TryGetValue(DbProviderManifest.NullableFacetName, false, out nullable) && ((bool)nullable.Value)) { result = typeof(Nullable<>).MakeGenericType(result); } break; case BuiltInTypeKind.RowType: result = typeof(IDataRecord); break; default: throw EntityUtil.UnexpectedMetadataType(edmType); } return result; } ////// Get ///instance associated with this field descriptor. /// /// The internal EdmProperty EdmProperty { get { return _property; } } public override Type ComponentType { get { return _componentType; } } public override bool IsReadOnly { get { return _isReadOnly; } } public override Type PropertyType { get { return _fieldType; } } public override bool CanResetValue(object component) { return false; } public override object GetValue(object component) { EntityUtil.CheckArgumentNull(component, "component"); if (!_componentType.IsAssignableFrom(component.GetType())) { throw EntityUtil.IncompatibleArgument(); } object propertyValue; if (component is IEntityWithChangeTracker) //POCO will relax this requirement. { propertyValue = LightweightCodeGenerator.GetValue(_property, component); } else { DbDataRecord dbDataRecord = component as DbDataRecord; if (dbDataRecord != null) { propertyValue = (dbDataRecord.GetValue(dbDataRecord.GetOrdinal(_property.Name))); } else { throw EntityUtil.NotSupported(); } } return propertyValue; } public override void ResetValue(object component) { throw EntityUtil.NotSupported(); } public override void SetValue(object component, object value) { EntityUtil.CheckArgumentNull(component, "component"); if (!_componentType.IsAssignableFrom(component.GetType())) { throw EntityUtil.IncompatibleArgument(); } if (!_isReadOnly && component is IEntityWithChangeTracker) //POCO will relax this requirement { LightweightCodeGenerator.SetValue(_property, component, value); } // if not entity it must be readonly else { throw EntityUtil.WriteOperationNotAllowedOnReadOnlyBindingList(); } } public override bool ShouldSerializeValue(object component) { return false; } public override bool IsBrowsable { get { return true; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- //instance associated with this field descriptor, /// or null if there is no EDM property association. /// // Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Data.Common; using System.Data.Objects.DataClasses; using System.Data.Metadata.Edm; namespace System.Data.Objects { internal sealed class FieldDescriptor : PropertyDescriptor { private readonly EdmProperty _property; private readonly Type _fieldType; private readonly Type _componentType; private readonly bool _isReadOnly; ////// Construct a new instance of the FieldDescriptor class that describes a property /// on components of the supplied type. /// /// Type of object whose property is described by this FieldDescriptor. /// /// True if property value on component can be modified; otherwise false. /// /// /// EdmProperty that describes the property on the component. /// internal FieldDescriptor(Type componentType, bool isReadOnly, EdmProperty property) : base(property.Name, null) { _componentType = componentType; _property = property; _isReadOnly = isReadOnly; _fieldType = DetermineClrType(_property.TypeUsage); System.Diagnostics.Debug.Assert(_fieldType != null, "FieldDescriptor's CLR type has unexpected value of null."); } ////// Determine a CLR Type to use a property descriptro form an EDM TypeUsage /// /// The EDM TypeUsage containing metadata about the type ///A CLR type that represents that EDM type private Type DetermineClrType(TypeUsage typeUsage) { Type result = null; EdmType edmType = typeUsage.EdmType; switch (edmType.BuiltInTypeKind) { case BuiltInTypeKind.EntityType: case BuiltInTypeKind.ComplexType: result = edmType.ClrType; break; case BuiltInTypeKind.RefType: result = typeof(EntityKey); break; case BuiltInTypeKind.CollectionType: TypeUsage elementTypeUse = ((CollectionType)edmType).TypeUsage; result = DetermineClrType(elementTypeUse); result = typeof(IEnumerable<>).MakeGenericType(result); break; case BuiltInTypeKind.PrimitiveType: result = edmType.ClrType; Facet nullable; if (result.IsValueType && typeUsage.Facets.TryGetValue(DbProviderManifest.NullableFacetName, false, out nullable) && ((bool)nullable.Value)) { result = typeof(Nullable<>).MakeGenericType(result); } break; case BuiltInTypeKind.RowType: result = typeof(IDataRecord); break; default: throw EntityUtil.UnexpectedMetadataType(edmType); } return result; } ////// Get ///instance associated with this field descriptor. /// /// The internal EdmProperty EdmProperty { get { return _property; } } public override Type ComponentType { get { return _componentType; } } public override bool IsReadOnly { get { return _isReadOnly; } } public override Type PropertyType { get { return _fieldType; } } public override bool CanResetValue(object component) { return false; } public override object GetValue(object component) { EntityUtil.CheckArgumentNull(component, "component"); if (!_componentType.IsAssignableFrom(component.GetType())) { throw EntityUtil.IncompatibleArgument(); } object propertyValue; if (component is IEntityWithChangeTracker) //POCO will relax this requirement. { propertyValue = LightweightCodeGenerator.GetValue(_property, component); } else { DbDataRecord dbDataRecord = component as DbDataRecord; if (dbDataRecord != null) { propertyValue = (dbDataRecord.GetValue(dbDataRecord.GetOrdinal(_property.Name))); } else { throw EntityUtil.NotSupported(); } } return propertyValue; } public override void ResetValue(object component) { throw EntityUtil.NotSupported(); } public override void SetValue(object component, object value) { EntityUtil.CheckArgumentNull(component, "component"); if (!_componentType.IsAssignableFrom(component.GetType())) { throw EntityUtil.IncompatibleArgument(); } if (!_isReadOnly && component is IEntityWithChangeTracker) //POCO will relax this requirement { LightweightCodeGenerator.SetValue(_property, component, value); } // if not entity it must be readonly else { throw EntityUtil.WriteOperationNotAllowedOnReadOnlyBindingList(); } } public override bool ShouldSerializeValue(object component) { return false; } public override bool IsBrowsable { get { return true; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.instance associated with this field descriptor, /// or null if there is no EDM property association. ///
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- WebPartConnectionsCancelEventArgs.cs
- FieldAccessException.cs
- InProcStateClientManager.cs
- CompilerLocalReference.cs
- DynamicAttribute.cs
- WsdlWriter.cs
- SwitchDesigner.xaml.cs
- URLString.cs
- SqlUnionizer.cs
- SctClaimSerializer.cs
- AssemblyBuilder.cs
- RemoteWebConfigurationHostServer.cs
- XmlHelper.cs
- ActivityExecutionContext.cs
- DiagnosticsConfiguration.cs
- QilXmlWriter.cs
- WeakReferenceList.cs
- ExecutionContext.cs
- DateTimeConverter.cs
- SafeLibraryHandle.cs
- NamedElement.cs
- ClientConfigurationSystem.cs
- FactoryRecord.cs
- ExplicitDiscriminatorMap.cs
- FullTextBreakpoint.cs
- DuplexChannelFactory.cs
- XmlBinaryWriter.cs
- HtmlTable.cs
- ErrorEventArgs.cs
- DefinitionUpdate.cs
- DataListGeneralPage.cs
- ExpressionVisitor.cs
- PolyLineSegment.cs
- RegexRunner.cs
- CodeFieldReferenceExpression.cs
- UnsafeNativeMethods.cs
- SequenceDesigner.cs
- HandlerBase.cs
- WebPartChrome.cs
- XmlQueryCardinality.cs
- DataGridViewSelectedCellsAccessibleObject.cs
- ValidationSettings.cs
- WindowsListViewScroll.cs
- DocumentCollection.cs
- OperationPerformanceCounters.cs
- ScrollViewer.cs
- Brush.cs
- SqlUserDefinedAggregateAttribute.cs
- MultiSelector.cs
- StrongName.cs
- AdRotator.cs
- TerminatorSinks.cs
- CommandDevice.cs
- SerializationStore.cs
- RefreshPropertiesAttribute.cs
- unsafenativemethodsother.cs
- SmiEventSink_Default.cs
- SqlInfoMessageEvent.cs
- ConnectionsZone.cs
- ParameterBuilder.cs
- ChannelDispatcherCollection.cs
- InvokePattern.cs
- MethodAccessException.cs
- VariantWrapper.cs
- ResXBuildProvider.cs
- XPathDocumentIterator.cs
- OrderedDictionary.cs
- LinqToSqlWrapper.cs
- Deflater.cs
- SafePointer.cs
- RequestedSignatureDialog.cs
- GridViewColumnHeaderAutomationPeer.cs
- SpnegoTokenAuthenticator.cs
- SpeechUI.cs
- ExpressionDumper.cs
- ValueProviderWrapper.cs
- InstalledFontCollection.cs
- SignedXml.cs
- CallbackValidator.cs
- GridViewCommandEventArgs.cs
- WebCategoryAttribute.cs
- DBPropSet.cs
- AssemblyHelper.cs
- SoapCodeExporter.cs
- TypeGeneratedEventArgs.cs
- ListenerHandler.cs
- PathGeometry.cs
- ByteRangeDownloader.cs
- SettingsContext.cs
- TimerEventSubscription.cs
- FilteredAttributeCollection.cs
- InternalRelationshipCollection.cs
- HttpRuntime.cs
- PathData.cs
- RegexRunner.cs
- WebFormDesignerActionService.cs
- SupportsEventValidationAttribute.cs
- HotSpot.cs
- RegexCode.cs
- GenericArgumentsUpdater.cs