Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / ExecutionProperties.cs / 1305376 / ExecutionProperties.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Activities { using System; using System.Activities.Runtime; using System.Collections; using System.Collections.Generic; using System.Diagnostics.CodeAnalysis; using System.Runtime; [SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldHaveCorrectSuffix)] [Fx.Tag.XamlVisible(false)] public sealed class ExecutionProperties : IEnumerable> { static IEnumerable > emptyKeyValues; ActivityContext context; ActivityInstance scope; ExecutionPropertyManager properties; IdSpace currentIdSpace; internal ExecutionProperties(ActivityContext currentContext, ActivityInstance scope, ExecutionPropertyManager properties) { this.context = currentContext; this.scope = scope; this.properties = properties; if (this.context != null) { this.currentIdSpace = this.context.Activity.MemberOf; } } public bool IsEmpty { get { return (this.properties == null); } } static IEnumerable > EmptyKeyValues { get { if (emptyKeyValues == null) { emptyKeyValues = new KeyValuePair [0]; } return emptyKeyValues; } } [Fx.Tag.InheritThrows(From = "Register", FromDeclaringType = typeof(IPropertyRegistrationCallback))] public void Add(string name, object property) { Add(name, property, false, false); } [Fx.Tag.InheritThrows(From = "Add")] public void Add(string name, object property, bool onlyVisibleToPublicChildren) { Add(name, property, false, onlyVisibleToPublicChildren); } internal void Add(string name, object property, bool skipValidations, bool onlyVisibleToPublicChildren) { if (!skipValidations) { if (string.IsNullOrEmpty(name)) { throw FxTrace.Exception.ArgumentNullOrEmpty("name"); } if (property == null) { throw FxTrace.Exception.ArgumentNull("property"); } ThrowIfActivityExecutionContextDisposed(); ThrowIfChildrenAreExecuting(); } if (this.properties != null) { this.properties.ThrowIfAlreadyDefined(name, this.scope); } IPropertyRegistrationCallback registrationCallback = property as IPropertyRegistrationCallback; if (registrationCallback != null) { registrationCallback.Register(new RegistrationContext(this.properties, this.currentIdSpace)); } if (this.properties == null) { this.properties = new ExecutionPropertyManager(this.scope); } else if (!this.properties.IsOwner(this.scope)) { // this.properties = new ExecutionPropertyManager(this.scope, this.properties); } IdSpace visibility = null; if (onlyVisibleToPublicChildren) { Fx.Assert(this.currentIdSpace != null, "We should never call OnlyVisibleToPublicChildren when we don't have a currentIdSpace"); visibility = this.currentIdSpace; } this.properties.Add(name, property, visibility); } [Fx.Tag.InheritThrows(From = "Unregister", FromDeclaringType = typeof(IPropertyRegistrationCallback))] public bool Remove(string name) { return Remove(name, false); } internal bool Remove(string name, bool skipValidations) { if (!skipValidations) { if (string.IsNullOrEmpty(name)) { throw FxTrace.Exception.ArgumentNullOrEmpty("name"); } ThrowIfActivityExecutionContextDisposed(); } if (this.properties != null && this.properties.IsOwner(this.scope)) { object property = this.properties.GetPropertyAtCurrentScope(name); if (property != null) { if (!skipValidations) { Handle handleProperty = property as Handle; if (handleProperty == null || !handleProperty.CanBeRemovedWithExecutingChildren) { ThrowIfChildrenAreExecuting(); } } this.properties.Remove(name); IPropertyRegistrationCallback registrationCallback = property as IPropertyRegistrationCallback; if (registrationCallback != null) { registrationCallback.Unregister(new RegistrationContext(this.properties, this.currentIdSpace)); } return true; } } return false; } public object Find(string name) { if (string.IsNullOrEmpty(name)) { throw FxTrace.Exception.ArgumentNullOrEmpty("name"); } if (this.properties == null) { return null; } else { return this.properties.GetProperty(name, this.currentIdSpace); } } // Note that we don't need to pass the IdSpace here because we're // just checking for things that this activity has added. internal object FindAtCurrentScope(string name) { Fx.Assert(!string.IsNullOrEmpty(name), "We should only call this with non-null names"); if (this.properties == null || !this.properties.IsOwner(this.scope)) { return null; } else { return this.properties.GetPropertyAtCurrentScope(name); } } public IEnumerator > GetEnumerator() { return GetKeyValues().GetEnumerator(); } IEnumerator IEnumerable.GetEnumerator() { return GetKeyValues().GetEnumerator(); } IEnumerable > GetKeyValues() { if (this.properties != null) { return this.properties.GetFlattenedProperties(this.currentIdSpace); } else { return EmptyKeyValues; } } void ThrowIfChildrenAreExecuting() { if (this.scope.HasChildren) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.CannotAddOrRemoveWithChildren)); } } void ThrowIfActivityExecutionContextDisposed() { if (this.context.IsDisposed) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.AECForPropertiesHasBeenDisposed)); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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