Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Expressions / Add.cs / 1305376 / Add.cs
//---------------------------------------------------------------- // Copyright (c) Microsoft Corporation. All rights reserved. //--------------------------------------------------------------- namespace System.Activities.Expressions { using System.Activities; using System.Activities.Statements; using System.Activities.Validation; using System.Collections.Generic; using System.ComponentModel; using System.Linq.Expressions; using System.Runtime; public sealed class Add: CodeActivity { //Lock is not needed for operationFunction here. The reason is that delegates for a given Add are the same. //It's possible that 2 threads are assigning the operationFucntion at the same time. But it's okay because the compiled codes are the same. static Func checkedOperationFunction; static Func uncheckedOperationFunction; bool checkedOperation = true; [RequiredArgument] [DefaultValue(null)] public InArgument Left { get; set; } [RequiredArgument] [DefaultValue(null)] public InArgument Right { get; set; } [DefaultValue(true)] public bool Checked { get { return this.checkedOperation; } set { this.checkedOperation = value; } } protected override void CacheMetadata(CodeActivityMetadata metadata) { BinaryExpressionHelper.OnGetArguments(metadata, this.Left, this.Right); if (this.checkedOperation) { EnsureOperationFunction(metadata, ref checkedOperationFunction, ExpressionType.AddChecked); } else { EnsureOperationFunction(metadata, ref uncheckedOperationFunction, ExpressionType.Add); } } void EnsureOperationFunction(CodeActivityMetadata metadata, ref Func operationFunction, ExpressionType operatorType) { if (operationFunction == null) { ValidationError validationError; if (!BinaryExpressionHelper.TryGenerateLinqDelegate( operatorType, out operationFunction, out validationError)) { metadata.AddValidationError(validationError); } } } protected override TResult Execute(CodeActivityContext context) { TLeft leftValue = this.Left.Get(context); TRight rightValue = this.Right.Get(context); //if user changed Checked flag between Open and Execution, //a NRE may be thrown and that's by design if (this.checkedOperation) { return checkedOperationFunction(leftValue, rightValue); } else { return uncheckedOperationFunction(leftValue, rightValue); } } } } // 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
- ContentPresenter.cs
- TreeBuilder.cs
- SegmentInfo.cs
- PlatformNotSupportedException.cs
- ProxyWebPart.cs
- AddInIpcChannel.cs
- MemberRelationshipService.cs
- Processor.cs
- BasicBrowserDialog.cs
- MultiTrigger.cs
- HttpProtocolImporter.cs
- Clipboard.cs
- XmlSchemaObject.cs
- SingleConverter.cs
- SerializationFieldInfo.cs
- EdmProviderManifest.cs
- DbProviderFactory.cs
- CacheMemory.cs
- WindowsAuthenticationEventArgs.cs
- dataprotectionpermission.cs
- ScrollItemProviderWrapper.cs
- glyphs.cs
- UrlMappingsSection.cs
- DefaultAsyncDataDispatcher.cs
- ConfigurationManagerHelper.cs
- RightsManagementEncryptedStream.cs
- OrderingQueryOperator.cs
- LinkArea.cs
- RelationalExpressions.cs
- ImportContext.cs
- FillBehavior.cs
- ShapeTypeface.cs
- SamlSecurityTokenAuthenticator.cs
- DataGridViewCellValidatingEventArgs.cs
- UserNameSecurityTokenProvider.cs
- DataGridComponentEditor.cs
- ShapeTypeface.cs
- DesigntimeLicenseContextSerializer.cs
- DecoderExceptionFallback.cs
- ColumnMapProcessor.cs
- Point3DAnimationUsingKeyFrames.cs
- TdsRecordBufferSetter.cs
- ServiceModelSectionGroup.cs
- GridToolTip.cs
- EnumerableRowCollectionExtensions.cs
- ImageAttributes.cs
- RetriableClipboard.cs
- CompModSwitches.cs
- MenuItemStyleCollectionEditor.cs
- DbDataRecord.cs
- DbProviderManifest.cs
- RegexGroupCollection.cs
- Screen.cs
- ObjectDataSource.cs
- NetNamedPipeBinding.cs
- webproxy.cs
- TableParagraph.cs
- RepeatButton.cs
- MultipleViewProviderWrapper.cs
- TextRangeBase.cs
- EventMappingSettingsCollection.cs
- EditorZoneBase.cs
- SafeRightsManagementHandle.cs
- ImageCodecInfoPrivate.cs
- RenderData.cs
- XmlEntityReference.cs
- FlowPosition.cs
- TypeSystemProvider.cs
- CodeTypeDeclaration.cs
- Image.cs
- StyleConverter.cs
- CachingHintValidation.cs
- CompleteWizardStep.cs
- TrackingProfileCache.cs
- X509RawDataKeyIdentifierClause.cs
- DispatchChannelSink.cs
- MatrixAnimationUsingPath.cs
- Exceptions.cs
- BaseCollection.cs
- DependencyPropertyDescriptor.cs
- ResXResourceWriter.cs
- FixedDocument.cs
- HttpEncoder.cs
- SlotInfo.cs
- SvcMapFileLoader.cs
- GifBitmapEncoder.cs
- base64Transforms.cs
- SynchronizationLockException.cs
- SmiRecordBuffer.cs
- ScriptingRoleServiceSection.cs
- CatalogZoneAutoFormat.cs
- DescendantOverDescendantQuery.cs
- FileNotFoundException.cs
- SiteMapNodeItem.cs
- MultiAsyncResult.cs
- UnescapedXmlDiagnosticData.cs
- ServerIdentity.cs
- TreeSet.cs
- PaintValueEventArgs.cs
- ButtonStandardAdapter.cs