ExceptionHandlers.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / Behaviors / ExceptionHandlers.cs / 1305376 / ExceptionHandlers.cs
                        
                        
                            namespace System.Workflow.ComponentModel 
{
    #region Imports

    using System; 
    using System.Diagnostics;
    using System.Reflection; 
    using System.Drawing; 
    using System.Collections;
    using System.CodeDom; 
    using System.Globalization;
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using System.Workflow.ComponentModel; 
    using System.Workflow.ComponentModel.Design;
    using System.Workflow.ComponentModel.Compiler; 
    using System.Collections.Generic; 

    #endregion 

    [ToolboxItem(false)]
    [Designer(typeof(FaultHandlersActivityDesigner), typeof(IDesigner))]
    [ToolboxBitmap(typeof(FaultHandlersActivity), "Resources.Exceptions.png")] 
    [ActivityValidator(typeof(FaultHandlersActivityValidator))]
    [AlternateFlowActivity] 
    [SRCategory(SR.Standard)] 
    public sealed class FaultHandlersActivity : CompositeActivity, IActivityEventListener
    { 
        public FaultHandlersActivity()
        {
        }
 
        public FaultHandlersActivity(string name)
            : base(name) 
        { 
        }
 
        protected internal override void Initialize(IServiceProvider provider)
        {
            if (this.Parent == null)
                throw new InvalidOperationException(SR.GetString(SR.Error_MustHaveParent)); 

            base.Initialize(provider); 
        } 

        protected internal override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext) 
        {
            if (executionContext == null)
                throw new ArgumentNullException("executionContext");
 
            Debug.Assert(this.Parent.GetValue(ActivityExecutionContext.CurrentExceptionProperty) != null, "No Exception contained by parent");
 
            Exception excep = this.Parent.GetValue(ActivityExecutionContext.CurrentExceptionProperty) as Exception; 

            if (excep != null) 
            {
                Type exceptionType = excep.GetType();

                foreach (FaultHandlerActivity exceptionHandler in this.EnabledActivities) 
                {
                    if (CanHandleException(exceptionHandler, exceptionType)) 
                    { 
                        // remove exception from here, I ate it
                        this.Parent.RemoveProperty(ActivityExecutionContext.CurrentExceptionProperty); 
                        exceptionHandler.SetException(excep);
                        exceptionHandler.RegisterForStatusChange(Activity.ClosedEvent, this);
                        executionContext.ExecuteActivity(exceptionHandler);
                        return ActivityExecutionStatus.Executing; 
                    }
                } 
            } 
            return ActivityExecutionStatus.Closed;
        } 

        protected internal override ActivityExecutionStatus Cancel(ActivityExecutionContext executionContext)
        {
            if (executionContext == null) 
                throw new ArgumentNullException("executionContext");
 
            for (int i = 0; i < this.EnabledActivities.Count; ++i) 
            {
                Activity childActivity = this.EnabledActivities[i]; 

                if (childActivity.ExecutionStatus == ActivityExecutionStatus.Executing)
                    executionContext.CancelActivity(childActivity);
                if (childActivity.ExecutionStatus == ActivityExecutionStatus.Canceling || 
                    childActivity.ExecutionStatus == ActivityExecutionStatus.Faulting)
                    return this.ExecutionStatus; 
            } 
            return ActivityExecutionStatus.Closed;
        } 

        #region IActivityEventListener Members

        void IActivityEventListener.OnEvent(object sender, ActivityExecutionStatusChangedEventArgs e) 
        {
            if (sender == null) 
                throw new ArgumentNullException("sender"); 
            if (e == null)
                throw new ArgumentNullException("e"); 

            ActivityExecutionContext context = sender as ActivityExecutionContext;
            if (context == null)
                throw new ArgumentException(SR.Error_SenderMustBeActivityExecutionContext, "sender"); 

            e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, this); 
            context.CloseActivity(); 
        }
 
        [NonSerialized]
        bool activeChildRemoved = false;

        protected internal override void OnActivityChangeRemove(ActivityExecutionContext executionContext, Activity removedActivity) 
        {
            if (removedActivity == null) 
                throw new ArgumentNullException("removedActivity"); 

            if (executionContext == null) 
                throw new ArgumentNullException("executionContext");

            if (removedActivity.ExecutionStatus == ActivityExecutionStatus.Closed && this.ExecutionStatus != ActivityExecutionStatus.Closed)
                activeChildRemoved = true; 

            base.OnActivityChangeRemove(executionContext, removedActivity); 
        } 

        protected internal override void OnWorkflowChangesCompleted(ActivityExecutionContext executionContext) 
        {
            if (executionContext == null)
                throw new ArgumentNullException("executionContext");
 
            if (activeChildRemoved)
            { 
                executionContext.CloseActivity(); 
                activeChildRemoved = false;
            } 
            base.OnWorkflowChangesCompleted(executionContext);
        }
        protected override void OnClosed(IServiceProvider provider)
        { 
        }
        #endregion 
 
        private bool CanHandleException(FaultHandlerActivity exceptionHandler, Type et)
        { 
            Type canHandleType = exceptionHandler.FaultType;
            return (et == canHandleType || et.IsSubclassOf(canHandleType));
        }
    } 

    internal sealed class FaultHandlersActivityValidator : CompositeActivityValidator 
    { 
        public override ValidationErrorCollection Validate(ValidationManager manager, object obj)
        { 
            ValidationErrorCollection validationErrors = base.Validate(manager, obj);

            FaultHandlersActivity exceptionHandlers = obj as FaultHandlersActivity;
            if (exceptionHandlers == null) 
                throw new ArgumentException(SR.GetString(SR.Error_UnexpectedArgumentType, typeof(FaultHandlersActivity).FullName), "obj");
 
            Hashtable exceptionTypes = new Hashtable(); 
            ArrayList previousExceptionTypes = new ArrayList();
            bool bFoundNotFaultHandlerActivity = false; 
            foreach (Activity activity in exceptionHandlers.EnabledActivities)
            {
                // All child activities must be FaultHandlerActivity
                if (!(activity is FaultHandlerActivity)) 
                {
                    if (!bFoundNotFaultHandlerActivity) 
                    { 
                        validationErrors.Add(new ValidationError(SR.GetString(SR.Error_FaultHandlersActivityDeclNotAllFaultHandlerActivityDecl), ErrorNumbers.Error_FaultHandlersActivityDeclNotAllFaultHandlerActivityDecl));
                        bFoundNotFaultHandlerActivity = true; 
                    }
                }
                else
                { 
                    FaultHandlerActivity exceptionHandler = (FaultHandlerActivity)activity;
                    Type catchType = exceptionHandler.FaultType; 
                    if (catchType != null) 
                    {
                        if (exceptionTypes[catchType] == null) 
                        {
                            exceptionTypes[catchType] = 1;
                            previousExceptionTypes.Add(catchType);
                        } 
                        else if ((int)exceptionTypes[catchType] == 1)
                        { 
                            /*if (catchType == typeof(System.Exception)) 
                                validationErrors.Add(new ValidationError(SR.GetString(SR.Error_ScopeDuplicateFaultHandlerActivityForAll, exceptionHandlers.EnclosingDataContextActivity.GetType().Name), ErrorNumbers.Error_ScopeDuplicateFaultHandlerActivityForAll));
                            else*/ 
                            validationErrors.Add(new ValidationError(string.Format(CultureInfo.CurrentCulture, SR.GetString(SR.Error_ScopeDuplicateFaultHandlerActivityFor), new object[] { Helpers.GetEnclosingActivity(exceptionHandlers).GetType().Name, catchType.FullName }), ErrorNumbers.Error_ScopeDuplicateFaultHandlerActivityFor));

                            exceptionTypes[catchType] = 2;
                        } 

                        foreach (Type previousType in previousExceptionTypes) 
                        { 
                            if (previousType != catchType && previousType.IsAssignableFrom(catchType))
                                validationErrors.Add(new ValidationError(SR.GetString(SR.Error_FaultHandlerActivityWrongOrder, catchType.Name, previousType.Name), ErrorNumbers.Error_FaultHandlerActivityWrongOrder)); 
                        }
                    }
                }
            } 

            // fault handlers can not contain fault handlers, compensation handler and cancellation handler 
            if (((ISupportAlternateFlow)exceptionHandlers).AlternateFlowActivities.Count > 0) 
                validationErrors.Add(new ValidationError(SR.GetString(SR.Error_ModelingConstructsCanNotContainModelingConstructs), ErrorNumbers.Error_ModelingConstructsCanNotContainModelingConstructs));
 
            return validationErrors;
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ExceptionHandlers.cs source code in C# .NET

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