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
- WebExceptionStatus.cs
- BooleanAnimationBase.cs
- WindowsSysHeader.cs
- WorkflowDesignerMessageFilter.cs
- UrlAuthFailedErrorFormatter.cs
- CatalogZoneBase.cs
- Common.cs
- ViewSimplifier.cs
- PageBreakRecord.cs
- BitmapSourceSafeMILHandle.cs
- DbBuffer.cs
- Permission.cs
- AssemblyContextControlItem.cs
- QuaternionKeyFrameCollection.cs
- DataGridViewHitTestInfo.cs
- ObjectDataSourceView.cs
- WebPartExportVerb.cs
- StyleTypedPropertyAttribute.cs
- ReferenceConverter.cs
- QilName.cs
- OutputCacheProfile.cs
- WasHttpHandlersInstallComponent.cs
- ObjectFactoryCodeDomTreeGenerator.cs
- ResourcesChangeInfo.cs
- StructuralType.cs
- SharedPersonalizationStateInfo.cs
- BuildProviderUtils.cs
- ContainerActivationHelper.cs
- TextEditorSelection.cs
- TemplateBindingExpression.cs
- CommandDevice.cs
- XamlFilter.cs
- OracleException.cs
- DataControlLinkButton.cs
- isolationinterop.cs
- Registration.cs
- SizeLimitedCache.cs
- CorrelationManager.cs
- SHA512.cs
- ProcessModule.cs
- JoinElimination.cs
- DataObjectFieldAttribute.cs
- VirtualPathUtility.cs
- ObjectReaderCompiler.cs
- SqlHelper.cs
- TimeSpanSecondsOrInfiniteConverter.cs
- AttachedAnnotation.cs
- nulltextnavigator.cs
- UseAttributeSetsAction.cs
- AuthenticatedStream.cs
- IsolatedStorageFileStream.cs
- ObjectDataSourceMethodEventArgs.cs
- PropertyItem.cs
- ResizeGrip.cs
- EntityDataSourceColumn.cs
- LongAverageAggregationOperator.cs
- SerialStream.cs
- QuaternionRotation3D.cs
- QilLiteral.cs
- SmtpDigestAuthenticationModule.cs
- StrokeNode.cs
- Control.cs
- CultureInfoConverter.cs
- CompilerLocalReference.cs
- WindowsComboBox.cs
- SmiXetterAccessMap.cs
- IntSecurity.cs
- DbParameterHelper.cs
- ContractSearchPattern.cs
- ThrowHelper.cs
- CryptoConfig.cs
- TimeSpanStorage.cs
- MapPathBasedVirtualPathProvider.cs
- GeneralTransform2DTo3D.cs
- StdValidatorsAndConverters.cs
- OneOfElement.cs
- ArrayWithOffset.cs
- AssemblyContextControlItem.cs
- Polyline.cs
- EmptyStringExpandableObjectConverter.cs
- DefaultObjectSerializer.cs
- BitmapEffectvisualstate.cs
- ZoneButton.cs
- System.Data_BID.cs
- RequestQueue.cs
- DelegatingChannelListener.cs
- MethodBuilder.cs
- ScopedKnownTypes.cs
- ContentElement.cs
- SystemTcpConnection.cs
- DaylightTime.cs
- DESCryptoServiceProvider.cs
- PrePrepareMethodAttribute.cs
- ConfigsHelper.cs
- UnionCodeGroup.cs
- RenderContext.cs
- SiteMap.cs
- JpegBitmapDecoder.cs
- AdapterUtil.cs
- HiddenFieldPageStatePersister.cs