Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / FieldDescriptor.cs / 1305376 / 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; using System.Diagnostics; using System.Globalization; 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: Debug.Fail(string.Format(CultureInfo.CurrentCulture, "The type {0} was not the expected scalar, enumeration, collection, structural, nominal, or reference type.", edmType.GetType())); break; } 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; DbDataRecord dbDataRecord = component as DbDataRecord; if (dbDataRecord != null) { propertyValue = (dbDataRecord.GetValue(dbDataRecord.GetOrdinal(_property.Name))); } else { propertyValue = LightweightCodeGenerator.GetValue(_property, component); } 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) { 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
- SmiGettersStream.cs
- SqlConnectionString.cs
- DbDataSourceEnumerator.cs
- ExpanderAutomationPeer.cs
- WindowsSolidBrush.cs
- XmlSchemaInferenceException.cs
- ErrorProvider.cs
- GlobalDataBindingHandler.cs
- TypeContext.cs
- ApplicationManager.cs
- hresults.cs
- NavigationHelper.cs
- followingsibling.cs
- OleDbWrapper.cs
- EnvironmentPermission.cs
- MenuItem.cs
- SymmetricKey.cs
- TraceData.cs
- MILUtilities.cs
- EdmProperty.cs
- WorkflowTimerService.cs
- Enlistment.cs
- ColorConvertedBitmap.cs
- GraphicsPath.cs
- XmlBindingWorker.cs
- ChangeTracker.cs
- recordstatefactory.cs
- ObjectQuery_EntitySqlExtensions.cs
- ResizeBehavior.cs
- IndentedWriter.cs
- Int64AnimationUsingKeyFrames.cs
- CompiledQuery.cs
- Parameter.cs
- SqlCommandSet.cs
- Base64Decoder.cs
- DbConnectionPoolOptions.cs
- UnionExpr.cs
- WebPartPersonalization.cs
- SettingsBindableAttribute.cs
- DataGridViewAccessibleObject.cs
- Queue.cs
- keycontainerpermission.cs
- DataGridCellsPresenter.cs
- Literal.cs
- DateTimeParse.cs
- SqlConnectionPoolProviderInfo.cs
- CmsInterop.cs
- WMIInterop.cs
- ProfilePropertyNameValidator.cs
- CodeTypeReferenceCollection.cs
- ListView.cs
- RetrieveVirtualItemEventArgs.cs
- XmlQueryCardinality.cs
- SoapEnumAttribute.cs
- InfiniteTimeSpanConverter.cs
- WindowsRichEditRange.cs
- TypedColumnHandler.cs
- TableColumnCollectionInternal.cs
- CommandHelper.cs
- ResXFileRef.cs
- NotImplementedException.cs
- HMACSHA384.cs
- XmlNodeChangedEventManager.cs
- EventSetterHandlerConverter.cs
- XmlSignatureProperties.cs
- SoapDocumentServiceAttribute.cs
- ChangeInterceptorAttribute.cs
- ServiceMetadataBehavior.cs
- DesignerDataParameter.cs
- BaseValidator.cs
- CodeEventReferenceExpression.cs
- ItemsChangedEventArgs.cs
- PolyBezierSegmentFigureLogic.cs
- XmlSchemaValidator.cs
- login.cs
- Rotation3D.cs
- ErrorWebPart.cs
- ProxyWebPart.cs
- StreamResourceInfo.cs
- EntityException.cs
- MouseEventArgs.cs
- BulletedList.cs
- Matrix.cs
- FlagsAttribute.cs
- MimeImporter.cs
- ErrorTolerantObjectWriter.cs
- HtmlContainerControl.cs
- NetTcpBinding.cs
- ObjectDataSourceSelectingEventArgs.cs
- KeyValueSerializer.cs
- EngineSite.cs
- InputScopeAttribute.cs
- linebase.cs
- EffectiveValueEntry.cs
- IisTraceWebEventProvider.cs
- AuthenticationSection.cs
- HttpChannelBindingToken.cs
- GuidelineCollection.cs
- SplineKeyFrames.cs
- PrintPreviewControl.cs