Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Statements / InvokeDelegate.cs / 1305376 / InvokeDelegate.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Activities.Statements { using System.Collections.Generic; using System.Collections.ObjectModel; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; using System.Globalization; using System.Runtime; using System.Windows.Markup; [SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldNotHaveIncorrectSuffix, Justification = "Approved Workflow naming")] [ContentProperty("Delegate")] public sealed class InvokeDelegate : NativeActivity { IDictionarydelegateArguments; bool hasOutputArguments; public InvokeDelegate() { this.delegateArguments = new Dictionary (); } [DefaultValue(null)] public ActivityDelegate Delegate { get; set; } public IDictionary DelegateArguments { get { return this.delegateArguments; } } protected override void CacheMetadata(NativeActivityMetadata metadata) { Collection arguments = new Collection (); foreach (KeyValuePair entry in this.DelegateArguments) { RuntimeArgument argument = new RuntimeArgument(entry.Key, entry.Value.ArgumentType, entry.Value.Direction); metadata.Bind(entry.Value, argument); arguments.Add(argument); } metadata.SetArgumentsCollection(arguments); metadata.AddDelegate(this.Delegate); if (this.Delegate != null) { IList targetDelegateArguments = this.Delegate.RuntimeDelegateArguments; if (this.DelegateArguments.Count != targetDelegateArguments.Count) { metadata.AddValidationError(SR.WrongNumberOfArgumentsForActivityDelegate); } // Validate that the names and directionality of arguments in DelegateArguments dictionary // match the names and directionality of arguments returned by the ActivityDelegate.GetDelegateParameters // call above. for (int i = 0; i < targetDelegateArguments.Count; i++) { RuntimeDelegateArgument expectedParameter = targetDelegateArguments[i]; Argument delegateArgument = null; string parameterName = expectedParameter.Name; if (this.DelegateArguments.TryGetValue(parameterName, out delegateArgument)) { if (delegateArgument.Direction != expectedParameter.Direction) { metadata.AddValidationError(SR.DelegateParameterDirectionalityMismatch(parameterName, delegateArgument.Direction, expectedParameter.Direction)); } if (expectedParameter.Direction == ArgumentDirection.In) { if (!TypeHelper.AreTypesCompatible(delegateArgument.ArgumentType, expectedParameter.Type)) { metadata.AddValidationError(SR.DelegateInArgumentTypeMismatch(parameterName, expectedParameter.Type, delegateArgument.ArgumentType)); } } else { if (!TypeHelper.AreTypesCompatible(expectedParameter.Type, delegateArgument.ArgumentType)) { metadata.AddValidationError(SR.DelegateOutArgumentTypeMismatch(parameterName, expectedParameter.Type, delegateArgument.ArgumentType)); } } } else { metadata.AddValidationError(SR.InputParametersMissing(expectedParameter.Name)); } if (!this.hasOutputArguments && ArgumentDirectionHelper.IsOut(expectedParameter.Direction)) { this.hasOutputArguments = true; } } } } protected override void Execute(NativeActivityContext context) { if (Delegate == null || Delegate.Handler == null) { return; } Dictionary inputParameters = new Dictionary (); if (DelegateArguments.Count > 0) { foreach (KeyValuePair entry in DelegateArguments) { if (ArgumentDirectionHelper.IsIn(entry.Value.Direction)) { inputParameters.Add(entry.Key, entry.Value.Get(context)); } } } context.ScheduleDelegate(Delegate, inputParameters, new DelegateCompletionCallback(OnHandlerComplete), null); } void OnHandlerComplete(NativeActivityContext context, ActivityInstance completedInstance, IDictionary outArguments) { if (this.hasOutputArguments) { foreach (KeyValuePair entry in outArguments) { Argument argument = null; if (DelegateArguments.TryGetValue(entry.Key, out argument)) { if (ArgumentDirectionHelper.IsOut(argument.Direction)) { DelegateArguments[entry.Key].Set(context, entry.Value); } else { Fx.Assert(string.Format(CultureInfo.InvariantCulture, "Expected argument named '{0}' in the DelegateArguments collection to be an out argument.", entry.Key)); } } } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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