StateValidator.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Activities / StateValidator.cs / 1305376 / StateValidator.cs
                        

                        
                            namespace System.Workflow.Activities 
{
    #region Imports

    using System; 
    using System.Text;
    using System.Reflection; 
    using System.Collections; 
    using System.CodeDom;
    using System.ComponentModel; 
    using System.ComponentModel.Design;
    using System.Drawing.Design;
    using System.Drawing;
    using System.Diagnostics; 
    using System.Workflow.ComponentModel;
    using System.Workflow.ComponentModel.Design; 
    using System.Runtime.Serialization; 
    using System.Collections.Generic;
    using System.ComponentModel.Design.Serialization; 
    using System.Xml.Serialization;
    using System.Workflow.ComponentModel.Compiler;
    using System.Workflow.Activities.Common;
 
    #endregion
 
    #region StateValidator class 

    [System.Runtime.InteropServices.ComVisible(false)] 
    public class StateActivityValidator : CompositeActivityValidator
    {
        public override ValidationErrorCollection Validate(ValidationManager manager, object obj)
        { 
            ValidationErrorCollection validationErrors = new ValidationErrorCollection(base.Validate(manager, obj));
 
            StateActivity state = obj as StateActivity; 
            if (state == null)
                throw new ArgumentException(SR.GetString(SR.Error_UnexpectedArgumentType, typeof(StateActivity).FullName), "obj"); 

            // First we validate contaiment
            if (state.Parent != null)
            { 
                if (StateMachineHelpers.IsStateMachine(state))
                { 
                    validationErrors.Add(new ValidationError(SR.GetError_StateMachineWorkflowMustBeARootActivity(), ErrorNumbers.Error_StateMachineWorkflowMustBeARootActivity)); 
                    return validationErrors;
                } 
                else
                {
                    // Make sure that a State is always contained in
                    // another State or StateMachineWorkflow. State machine 
                    // within a sequential workflow is not supported
                    if (!(state.Parent is StateActivity)) 
                    { 
                        validationErrors.Add(new ValidationError(SR.GetError_InvalidStateActivityParent(), ErrorNumbers.Error_InvalidStateActivityParent));
                        return validationErrors; 
                    }
                }
            }
 
            if (state.Parent == null && !StateMachineHelpers.IsStateMachine(state))
            { 
                ValidateCustomStateActivity(state, validationErrors); 
            }
 
            if (StateMachineHelpers.IsLeafState(state))
            {
                ValidateLeafState(state, validationErrors);
            } 
            else if (StateMachineHelpers.IsRootState(state))
            { 
                ValidateRootState(state, validationErrors); 
            }
            else 
            {
                ValidateState(state, validationErrors);
            }
 
            ValidateEventDrivenActivities(state, validationErrors);
 
            return validationErrors; 
        }
 
        private static void ValidateCustomStateActivity(StateActivity state, ValidationErrorCollection validationErrors)
        {
            if (state.Activities.Count > 0)
            { 
                validationErrors.Add(new ValidationError(SR.GetError_BlackBoxCustomStateNotSupported(), ErrorNumbers.Error_BlackBoxCustomStateNotSupported));
            } 
        } 

        public override ValidationError ValidateActivityChange(Activity activity, ActivityChangeAction action) 
        {
            if (activity == null)
                throw new ArgumentNullException("activity");
            if (action == null) 
                throw new ArgumentNullException("action");
 
            if (activity.ExecutionStatus != ActivityExecutionStatus.Initialized && 
                activity.ExecutionStatus != ActivityExecutionStatus.Executing &&
                activity.ExecutionStatus != ActivityExecutionStatus.Closed) 
            {
                return new ValidationError(SR.GetString(SR.Error_DynamicActivity2, activity.QualifiedName, activity.ExecutionStatus, activity.GetType().FullName), ErrorNumbers.Error_DynamicActivity2);
            }
 
            RemovedActivityAction remove = action as RemovedActivityAction;
            if (remove != null) 
            { 
                StateActivity removedState = remove.OriginalRemovedActivity as StateActivity;
                if (removedState != null) 
                {
                    // we don't have a way to check if the removed
                    // activity is executing or not, so if the user is trying to
                    // remove a StateActivity, we simply disallow it. 
                    //
 
                    return new ValidationError( 
                        SR.GetError_CantRemoveState(removedState.QualifiedName),
                        ErrorNumbers.Error_CantRemoveState); 
                }

                if (activity.ExecutionStatus == ActivityExecutionStatus.Executing)
                { 
                    EventDrivenActivity removedEventDriven = remove.OriginalRemovedActivity as EventDrivenActivity;
                    if (removedEventDriven != null) 
                    { 
                        return new ValidationError(
                            SR.GetError_CantRemoveEventDrivenFromExecutingState(removedEventDriven.QualifiedName, activity.QualifiedName), 
                            ErrorNumbers.Error_CantRemoveEventDrivenFromExecutingState);
                    }
                }
            } 
            return null;
        } 
 
        /// 
        /// 
        /// 
        /// 
        /// 
        private static void ValidateLeafState(StateActivity state, ValidationErrorCollection validationErrors) 
        {
            ValidateLeafStateChildren(state, validationErrors); 
        } 

        ///  
        ///
        /// 
        /// 
        ///  
        private static void ValidateRootState(StateActivity state, ValidationErrorCollection validationErrors)
        { 
            ValidateCompositeStateChildren(state, validationErrors); 
            if (StateMachineHelpers.IsStateMachine(state))
            { 
                ValidateInitialState(state, validationErrors);
                ValidateCompletedState(state, validationErrors);
            }
        } 

        private static void ValidateState(StateActivity state, ValidationErrorCollection validationErrors) 
        { 
            ValidateCompositeStateChildren(state, validationErrors);
        } 

        #region Helpers

        private static void ValidateLeafStateChildren(StateActivity state, ValidationErrorCollection validationErrors) 
        {
            bool invalidChild = false; 
 
            foreach (Activity activity in state.Activities)
            { 
                if (!activity.Enabled)
                    continue;

                if (activity is EventDrivenActivity || 
                    activity is StateInitializationActivity ||
                    activity is StateFinalizationActivity) 
                { 
                    continue;
                } 
                else
                {
                    invalidChild = true;
                    break; 
                }
            } 
 
            // validate that all child activities are event driven activities.
            if (invalidChild) 
                validationErrors.Add(new ValidationError(
                    SR.GetError_InvalidLeafStateChild(),
                    ErrorNumbers.Error_InvalidLeafStateChild));
        } 

        private static void ValidateCompositeStateChildren(StateActivity state, ValidationErrorCollection validationErrors) 
        { 
            bool invalidChild = false;
 
            foreach (Activity activity in state.Activities)
            {
                if (!activity.Enabled)
                    continue; 

                if (activity is EventDrivenActivity || 
                    activity is StateActivity) 
                {
                    continue; 
                }
                else
                {
                    invalidChild = true; 
                    break;
                } 
            } 

            if (invalidChild) 
                validationErrors.Add(new ValidationError(
                    SR.GetError_InvalidCompositeStateChild(),
                    ErrorNumbers.Error_InvalidCompositeStateChild));
        } 

        private static void ValidateInitialState(StateActivity state, ValidationErrorCollection validationErrors) 
        { 
            string initialStateName = StateMachineHelpers.GetInitialStateName(state);
            if (String.IsNullOrEmpty(initialStateName)) 
            {
                if (state.Activities.Count > 0)
                {
                    // we only require an initial state if the state machine is 
                    // not empty
                    validationErrors.Add(new ValidationError( 
                        SR.GetString(SR.Error_PropertyNotSet, StateMachineWorkflowActivity.InitialStateNamePropertyName), 
                        ErrorNumbers.Error_PropertyNotSet, false,
                        StateMachineWorkflowActivity.InitialStateNamePropertyName)); 
                }
            }
            else
            { 
                StateActivity initialState = StateMachineHelpers.FindStateByName(
                    state, 
                    initialStateName); 
                if (initialState == null)
                { 
                    validationErrors.Add(new ValidationError(
                        SR.GetError_InitialStateMustPointToAState(),
                        ErrorNumbers.Error_InitialStateMustPointToAState,
                        false, 
                        StateMachineWorkflowActivity.InitialStateNamePropertyName));
                } 
                else 
                {
                    if (!StateMachineHelpers.IsLeafState(initialState)) 
                    {
                        validationErrors.Add(new ValidationError(
                            SR.GetError_InitialStateMustPointToALeafNodeState(),
                            ErrorNumbers.Error_InitialStateMustPointToALeafNodeState, 
                            false,
                            StateMachineWorkflowActivity.InitialStateNamePropertyName)); 
                    } 

                    // InitialState cannot be the completed state 
                    string completedStateName = StateMachineHelpers.GetCompletedStateName(state);
                    if (initialStateName == completedStateName)
                    {
                        validationErrors.Add(new ValidationError( 
                            SR.GetError_InitialStateMustBeDifferentThanCompletedState(),
                            ErrorNumbers.Error_InitialStateMustBeDifferentThanCompletedState, 
                            false, 
                            StateMachineWorkflowActivity.InitialStateNamePropertyName));
                    } 
                }
            }
        }
 
        private static void ValidateCompletedState(StateActivity state, ValidationErrorCollection validationErrors)
        { 
            string completedStateName = StateMachineHelpers.GetCompletedStateName(state); 
            if (!String.IsNullOrEmpty(completedStateName))
            { 
                StateActivity completedState = StateMachineHelpers.FindStateByName(
                    state,
                    completedStateName);
                if (completedState == null) 
                {
                    validationErrors.Add(new ValidationError( 
                        SR.GetError_CompletedStateMustPointToAState(), 
                        ErrorNumbers.Error_CompletedStateMustPointToAState,
                        false, 
                        StateMachineWorkflowActivity.CompletedStateNamePropertyName));
                }
                else
                { 
                    if (StateMachineHelpers.IsLeafState(completedState))
                    { 
                        if (completedState.EnabledActivities.Count > 0) 
                            validationErrors.Add(new ValidationError(
                                SR.GetString(SR.Error_CompletedStateCannotContainActivities), 
                                ErrorNumbers.Error_CompletedStateCannotContainActivities,
                                false,
                                StateMachineWorkflowActivity.CompletedStateNamePropertyName));
                    } 
                    else
                    { 
                        validationErrors.Add(new ValidationError( 
                            SR.GetError_CompletedStateMustPointToALeafNodeState(),
                            ErrorNumbers.Error_CompletedStateMustPointToALeafNodeState, 
                            false,
                            StateMachineWorkflowActivity.CompletedStateNamePropertyName));
                    }
                } 
            }
        } 
 
        private static void ValidateEventDrivenActivities(StateActivity state, ValidationErrorCollection validationErrors)
        { 
            List eventDrivenList = new List();

            foreach (Activity activity in state.EnabledActivities)
            { 
                EventDrivenActivity eventDriven = activity as EventDrivenActivity;
                if (eventDriven != null) 
                { 
                    eventDrivenList.Add(eventDriven);
                } 
            }
            foreach (EventDrivenActivity eventDriven in eventDrivenList)
            {
                bool result = ValidateMultipleIEventActivity(eventDriven, validationErrors); 
                if (!result)
                    break; 
            } 
        }
 
        private static bool ValidateMultipleIEventActivity(EventDrivenActivity eventDriven, ValidationErrorCollection validationErrors)
        {
            IEventActivity firstEventActivity = null;
            if (eventDriven.EnabledActivities.Count > 0) 
            {
                firstEventActivity = eventDriven.EnabledActivities[0] as IEventActivity; 
            } 

            return ValidateMultipleIEventActivityInCompositeActivity(eventDriven, firstEventActivity, eventDriven, validationErrors); 
        }

        private static bool ValidateMultipleIEventActivityInCompositeActivity(EventDrivenActivity eventDriven, IEventActivity firstEventActivity, CompositeActivity parent, ValidationErrorCollection validationErrors)
        { 
            foreach (Activity activity in parent.Activities)
            { 
                // Skip disabled activities or the first IEventActivity 
                // Note that we don't use EnabledActivities because we want to
                // enforce this rule inside Cancellation and Exception Handlers. 
                if (!activity.Enabled || activity == firstEventActivity)
                    continue;

                if (activity is IEventActivity) 
                {
                    validationErrors.Add(new ValidationError( 
                        SR.GetString(SR.Error_EventDrivenMultipleEventActivity, eventDriven.Name, typeof(IEventActivity).FullName, typeof(EventDrivenActivity).Name), 
                        ErrorNumbers.Error_EventDrivenMultipleEventActivity));
                    return false; 
                }
                else
                {
                    CompositeActivity compositeActivity = activity as CompositeActivity; 
                    if (compositeActivity != null)
                    { 
                        bool result = ValidateMultipleIEventActivityInCompositeActivity(eventDriven, firstEventActivity, compositeActivity, validationErrors); 
                        if (!result)
                            return false; 
                    }
                }
            }
            return true; 
        }
 
        #endregion 
    }
 
    #endregion StateValidator class
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
namespace System.Workflow.Activities 
{
    #region Imports

    using System; 
    using System.Text;
    using System.Reflection; 
    using System.Collections; 
    using System.CodeDom;
    using System.ComponentModel; 
    using System.ComponentModel.Design;
    using System.Drawing.Design;
    using System.Drawing;
    using System.Diagnostics; 
    using System.Workflow.ComponentModel;
    using System.Workflow.ComponentModel.Design; 
    using System.Runtime.Serialization; 
    using System.Collections.Generic;
    using System.ComponentModel.Design.Serialization; 
    using System.Xml.Serialization;
    using System.Workflow.ComponentModel.Compiler;
    using System.Workflow.Activities.Common;
 
    #endregion
 
    #region StateValidator class 

    [System.Runtime.InteropServices.ComVisible(false)] 
    public class StateActivityValidator : CompositeActivityValidator
    {
        public override ValidationErrorCollection Validate(ValidationManager manager, object obj)
        { 
            ValidationErrorCollection validationErrors = new ValidationErrorCollection(base.Validate(manager, obj));
 
            StateActivity state = obj as StateActivity; 
            if (state == null)
                throw new ArgumentException(SR.GetString(SR.Error_UnexpectedArgumentType, typeof(StateActivity).FullName), "obj"); 

            // First we validate contaiment
            if (state.Parent != null)
            { 
                if (StateMachineHelpers.IsStateMachine(state))
                { 
                    validationErrors.Add(new ValidationError(SR.GetError_StateMachineWorkflowMustBeARootActivity(), ErrorNumbers.Error_StateMachineWorkflowMustBeARootActivity)); 
                    return validationErrors;
                } 
                else
                {
                    // Make sure that a State is always contained in
                    // another State or StateMachineWorkflow. State machine 
                    // within a sequential workflow is not supported
                    if (!(state.Parent is StateActivity)) 
                    { 
                        validationErrors.Add(new ValidationError(SR.GetError_InvalidStateActivityParent(), ErrorNumbers.Error_InvalidStateActivityParent));
                        return validationErrors; 
                    }
                }
            }
 
            if (state.Parent == null && !StateMachineHelpers.IsStateMachine(state))
            { 
                ValidateCustomStateActivity(state, validationErrors); 
            }
 
            if (StateMachineHelpers.IsLeafState(state))
            {
                ValidateLeafState(state, validationErrors);
            } 
            else if (StateMachineHelpers.IsRootState(state))
            { 
                ValidateRootState(state, validationErrors); 
            }
            else 
            {
                ValidateState(state, validationErrors);
            }
 
            ValidateEventDrivenActivities(state, validationErrors);
 
            return validationErrors; 
        }
 
        private static void ValidateCustomStateActivity(StateActivity state, ValidationErrorCollection validationErrors)
        {
            if (state.Activities.Count > 0)
            { 
                validationErrors.Add(new ValidationError(SR.GetError_BlackBoxCustomStateNotSupported(), ErrorNumbers.Error_BlackBoxCustomStateNotSupported));
            } 
        } 

        public override ValidationError ValidateActivityChange(Activity activity, ActivityChangeAction action) 
        {
            if (activity == null)
                throw new ArgumentNullException("activity");
            if (action == null) 
                throw new ArgumentNullException("action");
 
            if (activity.ExecutionStatus != ActivityExecutionStatus.Initialized && 
                activity.ExecutionStatus != ActivityExecutionStatus.Executing &&
                activity.ExecutionStatus != ActivityExecutionStatus.Closed) 
            {
                return new ValidationError(SR.GetString(SR.Error_DynamicActivity2, activity.QualifiedName, activity.ExecutionStatus, activity.GetType().FullName), ErrorNumbers.Error_DynamicActivity2);
            }
 
            RemovedActivityAction remove = action as RemovedActivityAction;
            if (remove != null) 
            { 
                StateActivity removedState = remove.OriginalRemovedActivity as StateActivity;
                if (removedState != null) 
                {
                    // we don't have a way to check if the removed
                    // activity is executing or not, so if the user is trying to
                    // remove a StateActivity, we simply disallow it. 
                    //
 
                    return new ValidationError( 
                        SR.GetError_CantRemoveState(removedState.QualifiedName),
                        ErrorNumbers.Error_CantRemoveState); 
                }

                if (activity.ExecutionStatus == ActivityExecutionStatus.Executing)
                { 
                    EventDrivenActivity removedEventDriven = remove.OriginalRemovedActivity as EventDrivenActivity;
                    if (removedEventDriven != null) 
                    { 
                        return new ValidationError(
                            SR.GetError_CantRemoveEventDrivenFromExecutingState(removedEventDriven.QualifiedName, activity.QualifiedName), 
                            ErrorNumbers.Error_CantRemoveEventDrivenFromExecutingState);
                    }
                }
            } 
            return null;
        } 
 
        /// 
        /// 
        /// 
        /// 
        /// 
        private static void ValidateLeafState(StateActivity state, ValidationErrorCollection validationErrors) 
        {
            ValidateLeafStateChildren(state, validationErrors); 
        } 

        ///  
        ///
        /// 
        /// 
        ///  
        private static void ValidateRootState(StateActivity state, ValidationErrorCollection validationErrors)
        { 
            ValidateCompositeStateChildren(state, validationErrors); 
            if (StateMachineHelpers.IsStateMachine(state))
            { 
                ValidateInitialState(state, validationErrors);
                ValidateCompletedState(state, validationErrors);
            }
        } 

        private static void ValidateState(StateActivity state, ValidationErrorCollection validationErrors) 
        { 
            ValidateCompositeStateChildren(state, validationErrors);
        } 

        #region Helpers

        private static void ValidateLeafStateChildren(StateActivity state, ValidationErrorCollection validationErrors) 
        {
            bool invalidChild = false; 
 
            foreach (Activity activity in state.Activities)
            { 
                if (!activity.Enabled)
                    continue;

                if (activity is EventDrivenActivity || 
                    activity is StateInitializationActivity ||
                    activity is StateFinalizationActivity) 
                { 
                    continue;
                } 
                else
                {
                    invalidChild = true;
                    break; 
                }
            } 
 
            // validate that all child activities are event driven activities.
            if (invalidChild) 
                validationErrors.Add(new ValidationError(
                    SR.GetError_InvalidLeafStateChild(),
                    ErrorNumbers.Error_InvalidLeafStateChild));
        } 

        private static void ValidateCompositeStateChildren(StateActivity state, ValidationErrorCollection validationErrors) 
        { 
            bool invalidChild = false;
 
            foreach (Activity activity in state.Activities)
            {
                if (!activity.Enabled)
                    continue; 

                if (activity is EventDrivenActivity || 
                    activity is StateActivity) 
                {
                    continue; 
                }
                else
                {
                    invalidChild = true; 
                    break;
                } 
            } 

            if (invalidChild) 
                validationErrors.Add(new ValidationError(
                    SR.GetError_InvalidCompositeStateChild(),
                    ErrorNumbers.Error_InvalidCompositeStateChild));
        } 

        private static void ValidateInitialState(StateActivity state, ValidationErrorCollection validationErrors) 
        { 
            string initialStateName = StateMachineHelpers.GetInitialStateName(state);
            if (String.IsNullOrEmpty(initialStateName)) 
            {
                if (state.Activities.Count > 0)
                {
                    // we only require an initial state if the state machine is 
                    // not empty
                    validationErrors.Add(new ValidationError( 
                        SR.GetString(SR.Error_PropertyNotSet, StateMachineWorkflowActivity.InitialStateNamePropertyName), 
                        ErrorNumbers.Error_PropertyNotSet, false,
                        StateMachineWorkflowActivity.InitialStateNamePropertyName)); 
                }
            }
            else
            { 
                StateActivity initialState = StateMachineHelpers.FindStateByName(
                    state, 
                    initialStateName); 
                if (initialState == null)
                { 
                    validationErrors.Add(new ValidationError(
                        SR.GetError_InitialStateMustPointToAState(),
                        ErrorNumbers.Error_InitialStateMustPointToAState,
                        false, 
                        StateMachineWorkflowActivity.InitialStateNamePropertyName));
                } 
                else 
                {
                    if (!StateMachineHelpers.IsLeafState(initialState)) 
                    {
                        validationErrors.Add(new ValidationError(
                            SR.GetError_InitialStateMustPointToALeafNodeState(),
                            ErrorNumbers.Error_InitialStateMustPointToALeafNodeState, 
                            false,
                            StateMachineWorkflowActivity.InitialStateNamePropertyName)); 
                    } 

                    // InitialState cannot be the completed state 
                    string completedStateName = StateMachineHelpers.GetCompletedStateName(state);
                    if (initialStateName == completedStateName)
                    {
                        validationErrors.Add(new ValidationError( 
                            SR.GetError_InitialStateMustBeDifferentThanCompletedState(),
                            ErrorNumbers.Error_InitialStateMustBeDifferentThanCompletedState, 
                            false, 
                            StateMachineWorkflowActivity.InitialStateNamePropertyName));
                    } 
                }
            }
        }
 
        private static void ValidateCompletedState(StateActivity state, ValidationErrorCollection validationErrors)
        { 
            string completedStateName = StateMachineHelpers.GetCompletedStateName(state); 
            if (!String.IsNullOrEmpty(completedStateName))
            { 
                StateActivity completedState = StateMachineHelpers.FindStateByName(
                    state,
                    completedStateName);
                if (completedState == null) 
                {
                    validationErrors.Add(new ValidationError( 
                        SR.GetError_CompletedStateMustPointToAState(), 
                        ErrorNumbers.Error_CompletedStateMustPointToAState,
                        false, 
                        StateMachineWorkflowActivity.CompletedStateNamePropertyName));
                }
                else
                { 
                    if (StateMachineHelpers.IsLeafState(completedState))
                    { 
                        if (completedState.EnabledActivities.Count > 0) 
                            validationErrors.Add(new ValidationError(
                                SR.GetString(SR.Error_CompletedStateCannotContainActivities), 
                                ErrorNumbers.Error_CompletedStateCannotContainActivities,
                                false,
                                StateMachineWorkflowActivity.CompletedStateNamePropertyName));
                    } 
                    else
                    { 
                        validationErrors.Add(new ValidationError( 
                            SR.GetError_CompletedStateMustPointToALeafNodeState(),
                            ErrorNumbers.Error_CompletedStateMustPointToALeafNodeState, 
                            false,
                            StateMachineWorkflowActivity.CompletedStateNamePropertyName));
                    }
                } 
            }
        } 
 
        private static void ValidateEventDrivenActivities(StateActivity state, ValidationErrorCollection validationErrors)
        { 
            List eventDrivenList = new List();

            foreach (Activity activity in state.EnabledActivities)
            { 
                EventDrivenActivity eventDriven = activity as EventDrivenActivity;
                if (eventDriven != null) 
                { 
                    eventDrivenList.Add(eventDriven);
                } 
            }
            foreach (EventDrivenActivity eventDriven in eventDrivenList)
            {
                bool result = ValidateMultipleIEventActivity(eventDriven, validationErrors); 
                if (!result)
                    break; 
            } 
        }
 
        private static bool ValidateMultipleIEventActivity(EventDrivenActivity eventDriven, ValidationErrorCollection validationErrors)
        {
            IEventActivity firstEventActivity = null;
            if (eventDriven.EnabledActivities.Count > 0) 
            {
                firstEventActivity = eventDriven.EnabledActivities[0] as IEventActivity; 
            } 

            return ValidateMultipleIEventActivityInCompositeActivity(eventDriven, firstEventActivity, eventDriven, validationErrors); 
        }

        private static bool ValidateMultipleIEventActivityInCompositeActivity(EventDrivenActivity eventDriven, IEventActivity firstEventActivity, CompositeActivity parent, ValidationErrorCollection validationErrors)
        { 
            foreach (Activity activity in parent.Activities)
            { 
                // Skip disabled activities or the first IEventActivity 
                // Note that we don't use EnabledActivities because we want to
                // enforce this rule inside Cancellation and Exception Handlers. 
                if (!activity.Enabled || activity == firstEventActivity)
                    continue;

                if (activity is IEventActivity) 
                {
                    validationErrors.Add(new ValidationError( 
                        SR.GetString(SR.Error_EventDrivenMultipleEventActivity, eventDriven.Name, typeof(IEventActivity).FullName, typeof(EventDrivenActivity).Name), 
                        ErrorNumbers.Error_EventDrivenMultipleEventActivity));
                    return false; 
                }
                else
                {
                    CompositeActivity compositeActivity = activity as CompositeActivity; 
                    if (compositeActivity != null)
                    { 
                        bool result = ValidateMultipleIEventActivityInCompositeActivity(eventDriven, firstEventActivity, compositeActivity, validationErrors); 
                        if (!result)
                            return false; 
                    }
                }
            }
            return true; 
        }
 
        #endregion 
    }
 
    #endregion StateValidator class
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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