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
- ToolStripItemCollection.cs
- WorkflowRuntimeSection.cs
- ComPersistableTypeElementCollection.cs
- ResumeStoryboard.cs
- WmlCalendarAdapter.cs
- lengthconverter.cs
- TextProperties.cs
- x509utils.cs
- PeerCollaboration.cs
- GlobalizationAssembly.cs
- InteropBitmapSource.cs
- ScriptIgnoreAttribute.cs
- PiiTraceSource.cs
- ComContractElement.cs
- DataGridViewIntLinkedList.cs
- JsonServiceDocumentSerializer.cs
- ElementUtil.cs
- MsmqReceiveHelper.cs
- PasswordRecovery.cs
- EventArgs.cs
- PropertyItemInternal.cs
- ProgressBar.cs
- HttpStreamXmlDictionaryWriter.cs
- LineInfo.cs
- ClientTargetSection.cs
- Point4DConverter.cs
- Helpers.cs
- XmlUtf8RawTextWriter.cs
- TrackingMemoryStream.cs
- ComboBox.cs
- GridSplitter.cs
- CacheRequest.cs
- Utils.cs
- SizeAnimationClockResource.cs
- DependencyPropertyValueSerializer.cs
- Pts.cs
- DoubleAnimationClockResource.cs
- DataBoundControlHelper.cs
- HttpBrowserCapabilitiesWrapper.cs
- InputBuffer.cs
- BinaryFormatter.cs
- Path.cs
- EnumBuilder.cs
- SqlDataSourceView.cs
- ParameterModifier.cs
- LocatorManager.cs
- XmlSerializableServices.cs
- EnumValAlphaComparer.cs
- XmlNamedNodeMap.cs
- Clause.cs
- XmlAnyAttributeAttribute.cs
- BitmapMetadata.cs
- JapaneseLunisolarCalendar.cs
- DataGridCaption.cs
- XDeferredAxisSource.cs
- ViewValidator.cs
- QueueSurrogate.cs
- XhtmlBasicLinkAdapter.cs
- Models.cs
- AudioBase.cs
- DescriptionAttribute.cs
- SuspendDesigner.cs
- DocumentGridPage.cs
- WSUtilitySpecificationVersion.cs
- NotificationContext.cs
- CallInfo.cs
- PropertyInfo.cs
- GACMembershipCondition.cs
- MenuBase.cs
- CompileXomlTask.cs
- WinInet.cs
- RectAnimationBase.cs
- PanelStyle.cs
- TextModifier.cs
- HyperLinkColumn.cs
- Message.cs
- HtmlContainerControl.cs
- ContentControl.cs
- FixedNode.cs
- XmlAutoDetectWriter.cs
- Mouse.cs
- EventLog.cs
- ObjectSet.cs
- LinqDataSourceContextEventArgs.cs
- EntityKey.cs
- mansign.cs
- KerberosReceiverSecurityToken.cs
- Typography.cs
- FontFamilyConverter.cs
- HiddenField.cs
- XmlAnyElementAttribute.cs
- SqlWebEventProvider.cs
- DataGridViewTopLeftHeaderCell.cs
- PeerPresenceInfo.cs
- DSACryptoServiceProvider.cs
- GenericAuthenticationEventArgs.cs
- DesignerForm.cs
- PointCollectionConverter.cs
- SafeNativeHandle.cs
- Errors.cs