Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Expressions / Subtract.cs / 1305376 / Subtract.cs
//---------------------------------------------------------------- // Copyright (c) Microsoft Corporation. All rights reserved. //--------------------------------------------------------------- namespace System.Activities.Expressions { using System.Activities; using System.Activities.Statements; using System.Linq.Expressions; using System.Activities.Validation; using System.Collections.Generic; using System.ComponentModel; using System.Runtime; public sealed class Subtract: CodeActivity { //Lock is not needed for operationFunction here. The reason is that delegates for a given Subtract 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.SubtractChecked); } else { EnsureOperationFunction(metadata, ref uncheckedOperationFunction, ExpressionType.Subtract); } } 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
- dataSvcMapFileLoader.cs
- Pipe.cs
- WindowsTreeView.cs
- CodeEventReferenceExpression.cs
- ReflectTypeDescriptionProvider.cs
- ValidationEventArgs.cs
- TimeZoneInfo.cs
- RegexNode.cs
- NameValuePair.cs
- EntitySqlException.cs
- ScriptingJsonSerializationSection.cs
- TraversalRequest.cs
- WriteTimeStream.cs
- DataControlLinkButton.cs
- ControlTemplate.cs
- JulianCalendar.cs
- PtsHost.cs
- EntityKey.cs
- CollectionEditVerbManager.cs
- DataGridViewRowEventArgs.cs
- Span.cs
- CollectionChangeEventArgs.cs
- DynamicEntity.cs
- PasswordRecoveryDesigner.cs
- XamlRtfConverter.cs
- ExpandCollapseProviderWrapper.cs
- BmpBitmapEncoder.cs
- XpsTokenContext.cs
- ModuleElement.cs
- SectionXmlInfo.cs
- TypeHelper.cs
- AsymmetricSignatureFormatter.cs
- TreeViewHitTestInfo.cs
- XPathException.cs
- DependencyPropertyKind.cs
- XmlHierarchicalEnumerable.cs
- DropAnimation.xaml.cs
- ValidatorCompatibilityHelper.cs
- HashMembershipCondition.cs
- ParameterCollectionEditor.cs
- RijndaelManaged.cs
- OpenFileDialog.cs
- ChangeBlockUndoRecord.cs
- SqlTypeConverter.cs
- UnknownWrapper.cs
- DSASignatureDeformatter.cs
- DBConcurrencyException.cs
- DoubleLink.cs
- COM2AboutBoxPropertyDescriptor.cs
- Baml2006SchemaContext.cs
- MenuItemCollectionEditor.cs
- ControlBuilder.cs
- SqlColumnizer.cs
- EventProxy.cs
- GroupQuery.cs
- BinaryReader.cs
- GACIdentityPermission.cs
- ConfigXmlWhitespace.cs
- ApplicationTrust.cs
- HighlightVisual.cs
- GPPOINTF.cs
- RNGCryptoServiceProvider.cs
- CompilerState.cs
- Profiler.cs
- SafeFileHandle.cs
- ListBindableAttribute.cs
- ResizeGrip.cs
- CacheManager.cs
- ExpressionList.cs
- ScalarOps.cs
- XmlSerializerFactory.cs
- Rethrow.cs
- DefaultMemberAttribute.cs
- UriTemplateVariablePathSegment.cs
- Perspective.cs
- Line.cs
- FirstMatchCodeGroup.cs
- ToolStripSystemRenderer.cs
- DuplexChannelFactory.cs
- SafeNativeMethods.cs
- SchemaCompiler.cs
- AmbientLight.cs
- EventSetterHandlerConverter.cs
- RowsCopiedEventArgs.cs
- SafeFileMappingHandle.cs
- InvalidEnumArgumentException.cs
- LineGeometry.cs
- InvalidateEvent.cs
- shaperfactory.cs
- GeneratedCodeAttribute.cs
- ScalarOps.cs
- MetafileHeader.cs
- DirectoryObjectSecurity.cs
- RuntimeHelpers.cs
- TextProperties.cs
- Hyperlink.cs
- CommaDelimitedStringAttributeCollectionConverter.cs
- OrthographicCamera.cs
- UseLicense.cs
- XPathNavigatorKeyComparer.cs