DeclarativeExpressionConditionDeclaration.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 / Rules / DeclarativeExpressionConditionDeclaration.cs / 1305376 / DeclarativeExpressionConditionDeclaration.cs

                            // ---------------------------------------------------------------------------- 
// Copyright (C) 2005 Microsoft Corporation - All Rights Reserved
// ---------------------------------------------------------------------------

using System.CodeDom; 
using System.Collections.Generic;
using System.ComponentModel; 
using System.Globalization; 
using System.Text;
using System.Workflow.ComponentModel; 
using System.Workflow.ComponentModel.Compiler;
using System.Workflow.ComponentModel.Design;
using System.Workflow.Activities.Common;
 
namespace System.Workflow.Activities.Rules
{ 
    #region RuleCondition base class 
    [Serializable]
    public abstract class RuleCondition 
    {
        public abstract bool Validate(RuleValidation validation);
        public abstract bool Evaluate(RuleExecution execution);
        public abstract ICollection GetDependencies(RuleValidation validation); 

        public abstract string Name { get; set; } 
        public virtual void OnRuntimeInitialized() { } 

        public abstract RuleCondition Clone(); 
    }
    #endregion

    #region RuleExpressionCondition Class 
    [Serializable]
    public sealed class RuleExpressionCondition : RuleCondition 
    { 
        #region Properties
        private CodeExpression _expression; 
        private string _name;
        private bool _runtimeInitialized;
        [NonSerialized]
        private object _expressionLock = new object(); 

        public override string Name 
        { 
            get
            { 
                return this._name;
            }
            set
            { 
                if (this._runtimeInitialized)
                    throw new InvalidOperationException(SR.GetString(SR.Error_CanNotChangeAtRuntime)); 
 
                this._name = value;
            } 
        }

        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public CodeExpression Expression 
        {
            get 
            { 
                return _expression;
            } 
            set
            {
                if (this._runtimeInitialized)
                    throw new InvalidOperationException(SR.GetString(SR.Error_CanNotChangeAtRuntime)); 

                lock (this._expressionLock) 
                { 
                    _expression = value;
                } 
            }
        }

        #endregion 

        #region Constructors 
        public RuleExpressionCondition() 
        {
        } 

        public RuleExpressionCondition(string conditionName)
        {
            if (null == conditionName) 
            {
                throw new ArgumentNullException("conditionName"); 
            } 
            _name = conditionName;
        } 

        public RuleExpressionCondition(string conditionName, CodeExpression expression)
            : this(conditionName)
        { 
            _expression = expression;
        } 
 
        public RuleExpressionCondition(CodeExpression expression)
        { 
            _expression = expression;
        }
        #endregion
 
        #region Public Methods
 
        public override void OnRuntimeInitialized() 
        {
            if (this._runtimeInitialized) 

                return;

            _runtimeInitialized = true; 
        }
 
 
        public override bool Equals(object obj)
        { 
            bool equals = false;
            RuleExpressionCondition declarativeConditionDefinition = obj as RuleExpressionCondition;

            if (declarativeConditionDefinition != null) 
            {
                equals = ((this.Name == declarativeConditionDefinition.Name) && 
                          ((this._expression == null && declarativeConditionDefinition.Expression == null) || 
                           (this._expression != null && RuleExpressionWalker.Match(this._expression, declarativeConditionDefinition.Expression))));
            } 

            return equals;
        }
 
        public override int GetHashCode()
        { 
            return base.GetHashCode(); 
        }
 
        public override string ToString()
        {
            if (_expression != null)
            { 
                StringBuilder decompilation = new StringBuilder();
                RuleExpressionWalker.Decompile(decompilation, _expression, null); 
                return decompilation.ToString(); 
            }
            else 
            {
                return "";
            }
        } 

        #endregion 
 
        #region RuleExpressionCondition methods
 
        public override bool Validate(RuleValidation validation)
        {
            if (validation == null)
                throw new ArgumentNullException("validation"); 

            bool valid = true; 
 
            if (_expression == null)
            { 
                valid = false;

                string message = string.Format(CultureInfo.CurrentCulture, Messages.ConditionExpressionNull, typeof(CodePrimitiveExpression).ToString());
                ValidationError error = new ValidationError(message, ErrorNumbers.Error_EmptyExpression); 
                error.UserData[RuleUserDataKeys.ErrorObject] = this;
                validation.AddError(error); 
 
            }
            else 
            {
                valid = validation.ValidateConditionExpression(_expression);
            }
 
            return valid;
        } 
 
        public override bool Evaluate(RuleExecution execution)
        { 
            if (_expression == null)
                return true;

            return Executor.EvaluateBool(_expression, execution); 
        }
 
        public override ICollection GetDependencies(RuleValidation validation) 
        {
            RuleAnalysis analyzer = new RuleAnalysis(validation, false); 
            if (_expression != null)
                RuleExpressionWalker.AnalyzeUsage(analyzer, _expression, true, false, null);
            return analyzer.GetSymbols();
        } 
        #endregion
 
        #region Cloning 

        public override RuleCondition Clone() 
        {
            RuleExpressionCondition ruleCondition = (RuleExpressionCondition)this.MemberwiseClone();
            ruleCondition._runtimeInitialized = false;
            ruleCondition._expression = RuleExpressionWalker.Clone(this._expression); 
            return ruleCondition;
        } 
 
        #endregion
    } 
    #endregion

    #region RuleConditionReference Class
    [TypeConverter(typeof(Design.RuleConditionReferenceTypeConverter))] 
    [ActivityValidator(typeof(RuleConditionReferenceValidator))]
    [SRDisplayName(SR.RuleConditionDisplayName)] 
    public class RuleConditionReference : ActivityCondition 
    {
        private bool _runtimeInitialized; 
        private string _condition;
        private string declaringActivityId = string.Empty;

        public RuleConditionReference() 
        {
        } 
 
        public string ConditionName
        { 
            get { return this._condition; }
            set { this._condition = value; }
        }
 
        public override bool Evaluate(Activity activity, IServiceProvider provider)
        { 
            if (activity == null) 
            {
                throw new ArgumentNullException("activity"); 
            }
            if (string.IsNullOrEmpty(this._condition))
            {
                throw new InvalidOperationException(SR.GetString(SR.Error_MissingConditionName, activity.Name)); 
            }
 
            RuleDefinitions defs = null; 

            if (string.IsNullOrEmpty(this.declaringActivityId)) 
            {
                // No Runtime Initialization.
                CompositeActivity declaringActivity = null;
                defs = RuleConditionReference.GetRuleDefinitions(activity, out declaringActivity); 
            }
            else 
            { 
                // Runtime Initialized.
                defs = (RuleDefinitions)activity.GetActivityByName(declaringActivityId).GetValue(RuleDefinitions.RuleDefinitionsProperty); 
            }

            if ((defs == null) || (defs.Conditions == null))
            { 
                throw new InvalidOperationException(SR.GetString(SR.Error_MissingRuleConditions));
            } 
 
            RuleCondition conditionDefinitionToEvaluate = defs.Conditions[this._condition];
            if (conditionDefinitionToEvaluate != null) 
            {
                Activity contextActivity = System.Workflow.Activities.Common.Helpers.GetEnclosingActivity(activity);
                RuleValidation validation = new RuleValidation(contextActivity);
                if (!conditionDefinitionToEvaluate.Validate(validation)) 
                {
                    string message = string.Format(CultureInfo.CurrentCulture, Messages.ConditionValidationFailed, this._condition); 
                    throw new InvalidOperationException(message); 
                }
 
                RuleExecution context = new RuleExecution(validation, contextActivity, provider as ActivityExecutionContext);
                return conditionDefinitionToEvaluate.Evaluate(context);
            }
            else 
            {
                // no condition, so defaults to true 
                return true; 
            }
        } 

        //
        //  Method extracted from OnRuntimeInitialized
        //  used on special Evaluation case too. 
        //
        private static RuleDefinitions GetRuleDefinitions( 
            Activity activity, out CompositeActivity declaringActivity) 
        {
            declaringActivity = Helpers.GetDeclaringActivity(activity); 
            if (declaringActivity == null)
            {
                declaringActivity = Helpers.GetRootActivity(activity) as CompositeActivity;
            } 
            return ConditionHelper.Load_Rules_RT(declaringActivity);
        } 
 
        #region IInitializeForRuntime Members
 
        [NonSerialized]
        private object syncLock = new object();

        protected override void InitializeProperties() 
        {
            lock (syncLock) 
            { 
                if (this._runtimeInitialized)
                    return; 

                CompositeActivity declaringActivity = null;
                Activity ownerActivity = base.ParentDependencyObject as Activity;
 
                RuleDefinitions definitions = GetRuleDefinitions(ownerActivity, out declaringActivity);
                definitions.OnRuntimeInitialized(); 
 
                this.declaringActivityId = declaringActivity.QualifiedName;
                base.InitializeProperties(); 
                _runtimeInitialized = true;
            }
        }
        #endregion 

    } 
    #endregion 

    #region RuleConditionReferenceValidator Class 
    internal sealed class RuleConditionReferenceValidator : ConditionValidator
    {
        public override ValidationErrorCollection Validate(ValidationManager manager, object obj)
        { 
            if (manager == null)
            { 
                throw new ArgumentNullException("manager"); 
            }
            if (manager.Context == null) 
            {
                throw new InvalidOperationException(Messages.ContextStackMissing);
            }
 
            ValidationErrorCollection validationErrors = base.Validate(manager, obj);
 
            RuleConditionReference declarativeCondition = obj as RuleConditionReference; 
            if (declarativeCondition == null)
            { 
                string message = string.Format(CultureInfo.CurrentCulture, Messages.UnexpectedArgumentType, typeof(RuleConditionReference).FullName, "obj");
                throw new ArgumentException(message, "obj");
            }
 
            Activity activity = manager.Context[typeof(Activity)] as Activity;
            if (activity == null) 
            { 
                string message = string.Format(CultureInfo.CurrentCulture, Messages.ContextStackItemMissing, typeof(Activity).Name);
                throw new InvalidOperationException(message); 
            }

            PropertyValidationContext validationContext = manager.Context[typeof(PropertyValidationContext)] as PropertyValidationContext;
            if (validationContext == null) 
            {
                string message = string.Format(CultureInfo.CurrentCulture, Messages.ContextStackItemMissing, typeof(PropertyValidationContext).Name); 
                throw new InvalidOperationException(message); 
            }
            if (!string.IsNullOrEmpty(declarativeCondition.ConditionName)) 
            {
                RuleDefinitions rules = null;
                RuleConditionCollection conditionDefinitions = null;
 
                CompositeActivity declaringActivity = Helpers.GetDeclaringActivity(activity);
                if (declaringActivity == null) 
                { 
                    declaringActivity = Helpers.GetRootActivity(activity) as CompositeActivity;
                } 
                if(activity.Site != null)
                    rules = ConditionHelper.Load_Rules_DT(activity.Site, declaringActivity);
                else
                    rules = ConditionHelper.Load_Rules_RT(declaringActivity); 

                if (rules != null) 
                    conditionDefinitions = rules.Conditions; 

                if (conditionDefinitions == null || !conditionDefinitions.Contains(declarativeCondition.ConditionName)) 
                {
                    string message = string.Format(CultureInfo.CurrentCulture, Messages.ConditionNotFound, declarativeCondition.ConditionName);
                    ValidationError validationError = new ValidationError(message, ErrorNumbers.Error_ConditionNotFound);
                    validationError.PropertyName = GetFullPropertyName(manager) + "." + "ConditionName"; 
                    validationErrors.Add(validationError);
                } 
                else 
                {
                    RuleCondition actualCondition = conditionDefinitions[declarativeCondition.ConditionName]; 

                    ITypeProvider typeProvider = (ITypeProvider)manager.GetService(typeof(ITypeProvider));

                    IDisposable localContextScope = (WorkflowCompilationContext.Current == null ? WorkflowCompilationContext.CreateScope(manager) : null); 
                    try
                    { 
                        RuleValidation ruleValidator = new RuleValidation(activity, typeProvider, WorkflowCompilationContext.Current.CheckTypes); 
                        actualCondition.Validate(ruleValidator);
 
                        ValidationErrorCollection actualConditionErrors = ruleValidator.Errors;

                        if (actualConditionErrors.Count > 0)
                        { 
                            string expressionPropertyName = GetFullPropertyName(manager);
                            string genericErrorMsg = string.Format(CultureInfo.CurrentCulture, Messages.InvalidConditionExpression, expressionPropertyName); 
                            int errorNumber = ErrorNumbers.Error_InvalidConditionExpression; 

                            if (activity.Site != null) 
                            {
                                ValidationError validationError = new ValidationError(genericErrorMsg, errorNumber);
                                validationError.PropertyName = expressionPropertyName + "." + "Expression";
                                validationErrors.Add(validationError); 
                            }
                            else 
                            { 
                                foreach (ValidationError actualError in actualConditionErrors)
                                { 
                                    ValidationError validationError = new ValidationError(genericErrorMsg + " " + actualError.ErrorText, errorNumber);
                                    validationError.PropertyName = expressionPropertyName + "." + "Expression";
                                    validationErrors.Add(validationError);
                                } 
                            }
                        } 
 
                        // Test duplicates
                        foreach (RuleCondition definition in conditionDefinitions) 
                        {
                            if (definition.Name == declarativeCondition.ConditionName && definition != actualCondition)
                            {
                                string message = string.Format(CultureInfo.CurrentCulture, Messages.DuplicateConditions, declarativeCondition.ConditionName); 
                                ValidationError validationError = new ValidationError(message, ErrorNumbers.Error_DuplicateConditions);
                                validationError.PropertyName = GetFullPropertyName(manager) + "." + "ConditionName"; 
                                validationErrors.Add(validationError); 
                            }
                        } 
                    }
                    finally
                    {
                        if (localContextScope != null) 
                        {
                            localContextScope.Dispose(); 
                        } 
                    }
                } 
            }
            else
            {
                string message = string.Format(CultureInfo.CurrentCulture, Messages.InvalidConditionName, "ConditionName"); 
                ValidationError validationError = new ValidationError(message, ErrorNumbers.Error_InvalidConditionName);
                validationError.PropertyName = GetFullPropertyName(manager) + "." + "ConditionName"; 
                validationErrors.Add(validationError); 
            }
            return validationErrors; 
        }
    }
    #endregion
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
// ---------------------------------------------------------------------------- 
// Copyright (C) 2005 Microsoft Corporation - All Rights Reserved
// ---------------------------------------------------------------------------

using System.CodeDom; 
using System.Collections.Generic;
using System.ComponentModel; 
using System.Globalization; 
using System.Text;
using System.Workflow.ComponentModel; 
using System.Workflow.ComponentModel.Compiler;
using System.Workflow.ComponentModel.Design;
using System.Workflow.Activities.Common;
 
namespace System.Workflow.Activities.Rules
{ 
    #region RuleCondition base class 
    [Serializable]
    public abstract class RuleCondition 
    {
        public abstract bool Validate(RuleValidation validation);
        public abstract bool Evaluate(RuleExecution execution);
        public abstract ICollection GetDependencies(RuleValidation validation); 

        public abstract string Name { get; set; } 
        public virtual void OnRuntimeInitialized() { } 

        public abstract RuleCondition Clone(); 
    }
    #endregion

    #region RuleExpressionCondition Class 
    [Serializable]
    public sealed class RuleExpressionCondition : RuleCondition 
    { 
        #region Properties
        private CodeExpression _expression; 
        private string _name;
        private bool _runtimeInitialized;
        [NonSerialized]
        private object _expressionLock = new object(); 

        public override string Name 
        { 
            get
            { 
                return this._name;
            }
            set
            { 
                if (this._runtimeInitialized)
                    throw new InvalidOperationException(SR.GetString(SR.Error_CanNotChangeAtRuntime)); 
 
                this._name = value;
            } 
        }

        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public CodeExpression Expression 
        {
            get 
            { 
                return _expression;
            } 
            set
            {
                if (this._runtimeInitialized)
                    throw new InvalidOperationException(SR.GetString(SR.Error_CanNotChangeAtRuntime)); 

                lock (this._expressionLock) 
                { 
                    _expression = value;
                } 
            }
        }

        #endregion 

        #region Constructors 
        public RuleExpressionCondition() 
        {
        } 

        public RuleExpressionCondition(string conditionName)
        {
            if (null == conditionName) 
            {
                throw new ArgumentNullException("conditionName"); 
            } 
            _name = conditionName;
        } 

        public RuleExpressionCondition(string conditionName, CodeExpression expression)
            : this(conditionName)
        { 
            _expression = expression;
        } 
 
        public RuleExpressionCondition(CodeExpression expression)
        { 
            _expression = expression;
        }
        #endregion
 
        #region Public Methods
 
        public override void OnRuntimeInitialized() 
        {
            if (this._runtimeInitialized) 

                return;

            _runtimeInitialized = true; 
        }
 
 
        public override bool Equals(object obj)
        { 
            bool equals = false;
            RuleExpressionCondition declarativeConditionDefinition = obj as RuleExpressionCondition;

            if (declarativeConditionDefinition != null) 
            {
                equals = ((this.Name == declarativeConditionDefinition.Name) && 
                          ((this._expression == null && declarativeConditionDefinition.Expression == null) || 
                           (this._expression != null && RuleExpressionWalker.Match(this._expression, declarativeConditionDefinition.Expression))));
            } 

            return equals;
        }
 
        public override int GetHashCode()
        { 
            return base.GetHashCode(); 
        }
 
        public override string ToString()
        {
            if (_expression != null)
            { 
                StringBuilder decompilation = new StringBuilder();
                RuleExpressionWalker.Decompile(decompilation, _expression, null); 
                return decompilation.ToString(); 
            }
            else 
            {
                return "";
            }
        } 

        #endregion 
 
        #region RuleExpressionCondition methods
 
        public override bool Validate(RuleValidation validation)
        {
            if (validation == null)
                throw new ArgumentNullException("validation"); 

            bool valid = true; 
 
            if (_expression == null)
            { 
                valid = false;

                string message = string.Format(CultureInfo.CurrentCulture, Messages.ConditionExpressionNull, typeof(CodePrimitiveExpression).ToString());
                ValidationError error = new ValidationError(message, ErrorNumbers.Error_EmptyExpression); 
                error.UserData[RuleUserDataKeys.ErrorObject] = this;
                validation.AddError(error); 
 
            }
            else 
            {
                valid = validation.ValidateConditionExpression(_expression);
            }
 
            return valid;
        } 
 
        public override bool Evaluate(RuleExecution execution)
        { 
            if (_expression == null)
                return true;

            return Executor.EvaluateBool(_expression, execution); 
        }
 
        public override ICollection GetDependencies(RuleValidation validation) 
        {
            RuleAnalysis analyzer = new RuleAnalysis(validation, false); 
            if (_expression != null)
                RuleExpressionWalker.AnalyzeUsage(analyzer, _expression, true, false, null);
            return analyzer.GetSymbols();
        } 
        #endregion
 
        #region Cloning 

        public override RuleCondition Clone() 
        {
            RuleExpressionCondition ruleCondition = (RuleExpressionCondition)this.MemberwiseClone();
            ruleCondition._runtimeInitialized = false;
            ruleCondition._expression = RuleExpressionWalker.Clone(this._expression); 
            return ruleCondition;
        } 
 
        #endregion
    } 
    #endregion

    #region RuleConditionReference Class
    [TypeConverter(typeof(Design.RuleConditionReferenceTypeConverter))] 
    [ActivityValidator(typeof(RuleConditionReferenceValidator))]
    [SRDisplayName(SR.RuleConditionDisplayName)] 
    public class RuleConditionReference : ActivityCondition 
    {
        private bool _runtimeInitialized; 
        private string _condition;
        private string declaringActivityId = string.Empty;

        public RuleConditionReference() 
        {
        } 
 
        public string ConditionName
        { 
            get { return this._condition; }
            set { this._condition = value; }
        }
 
        public override bool Evaluate(Activity activity, IServiceProvider provider)
        { 
            if (activity == null) 
            {
                throw new ArgumentNullException("activity"); 
            }
            if (string.IsNullOrEmpty(this._condition))
            {
                throw new InvalidOperationException(SR.GetString(SR.Error_MissingConditionName, activity.Name)); 
            }
 
            RuleDefinitions defs = null; 

            if (string.IsNullOrEmpty(this.declaringActivityId)) 
            {
                // No Runtime Initialization.
                CompositeActivity declaringActivity = null;
                defs = RuleConditionReference.GetRuleDefinitions(activity, out declaringActivity); 
            }
            else 
            { 
                // Runtime Initialized.
                defs = (RuleDefinitions)activity.GetActivityByName(declaringActivityId).GetValue(RuleDefinitions.RuleDefinitionsProperty); 
            }

            if ((defs == null) || (defs.Conditions == null))
            { 
                throw new InvalidOperationException(SR.GetString(SR.Error_MissingRuleConditions));
            } 
 
            RuleCondition conditionDefinitionToEvaluate = defs.Conditions[this._condition];
            if (conditionDefinitionToEvaluate != null) 
            {
                Activity contextActivity = System.Workflow.Activities.Common.Helpers.GetEnclosingActivity(activity);
                RuleValidation validation = new RuleValidation(contextActivity);
                if (!conditionDefinitionToEvaluate.Validate(validation)) 
                {
                    string message = string.Format(CultureInfo.CurrentCulture, Messages.ConditionValidationFailed, this._condition); 
                    throw new InvalidOperationException(message); 
                }
 
                RuleExecution context = new RuleExecution(validation, contextActivity, provider as ActivityExecutionContext);
                return conditionDefinitionToEvaluate.Evaluate(context);
            }
            else 
            {
                // no condition, so defaults to true 
                return true; 
            }
        } 

        //
        //  Method extracted from OnRuntimeInitialized
        //  used on special Evaluation case too. 
        //
        private static RuleDefinitions GetRuleDefinitions( 
            Activity activity, out CompositeActivity declaringActivity) 
        {
            declaringActivity = Helpers.GetDeclaringActivity(activity); 
            if (declaringActivity == null)
            {
                declaringActivity = Helpers.GetRootActivity(activity) as CompositeActivity;
            } 
            return ConditionHelper.Load_Rules_RT(declaringActivity);
        } 
 
        #region IInitializeForRuntime Members
 
        [NonSerialized]
        private object syncLock = new object();

        protected override void InitializeProperties() 
        {
            lock (syncLock) 
            { 
                if (this._runtimeInitialized)
                    return; 

                CompositeActivity declaringActivity = null;
                Activity ownerActivity = base.ParentDependencyObject as Activity;
 
                RuleDefinitions definitions = GetRuleDefinitions(ownerActivity, out declaringActivity);
                definitions.OnRuntimeInitialized(); 
 
                this.declaringActivityId = declaringActivity.QualifiedName;
                base.InitializeProperties(); 
                _runtimeInitialized = true;
            }
        }
        #endregion 

    } 
    #endregion 

    #region RuleConditionReferenceValidator Class 
    internal sealed class RuleConditionReferenceValidator : ConditionValidator
    {
        public override ValidationErrorCollection Validate(ValidationManager manager, object obj)
        { 
            if (manager == null)
            { 
                throw new ArgumentNullException("manager"); 
            }
            if (manager.Context == null) 
            {
                throw new InvalidOperationException(Messages.ContextStackMissing);
            }
 
            ValidationErrorCollection validationErrors = base.Validate(manager, obj);
 
            RuleConditionReference declarativeCondition = obj as RuleConditionReference; 
            if (declarativeCondition == null)
            { 
                string message = string.Format(CultureInfo.CurrentCulture, Messages.UnexpectedArgumentType, typeof(RuleConditionReference).FullName, "obj");
                throw new ArgumentException(message, "obj");
            }
 
            Activity activity = manager.Context[typeof(Activity)] as Activity;
            if (activity == null) 
            { 
                string message = string.Format(CultureInfo.CurrentCulture, Messages.ContextStackItemMissing, typeof(Activity).Name);
                throw new InvalidOperationException(message); 
            }

            PropertyValidationContext validationContext = manager.Context[typeof(PropertyValidationContext)] as PropertyValidationContext;
            if (validationContext == null) 
            {
                string message = string.Format(CultureInfo.CurrentCulture, Messages.ContextStackItemMissing, typeof(PropertyValidationContext).Name); 
                throw new InvalidOperationException(message); 
            }
            if (!string.IsNullOrEmpty(declarativeCondition.ConditionName)) 
            {
                RuleDefinitions rules = null;
                RuleConditionCollection conditionDefinitions = null;
 
                CompositeActivity declaringActivity = Helpers.GetDeclaringActivity(activity);
                if (declaringActivity == null) 
                { 
                    declaringActivity = Helpers.GetRootActivity(activity) as CompositeActivity;
                } 
                if(activity.Site != null)
                    rules = ConditionHelper.Load_Rules_DT(activity.Site, declaringActivity);
                else
                    rules = ConditionHelper.Load_Rules_RT(declaringActivity); 

                if (rules != null) 
                    conditionDefinitions = rules.Conditions; 

                if (conditionDefinitions == null || !conditionDefinitions.Contains(declarativeCondition.ConditionName)) 
                {
                    string message = string.Format(CultureInfo.CurrentCulture, Messages.ConditionNotFound, declarativeCondition.ConditionName);
                    ValidationError validationError = new ValidationError(message, ErrorNumbers.Error_ConditionNotFound);
                    validationError.PropertyName = GetFullPropertyName(manager) + "." + "ConditionName"; 
                    validationErrors.Add(validationError);
                } 
                else 
                {
                    RuleCondition actualCondition = conditionDefinitions[declarativeCondition.ConditionName]; 

                    ITypeProvider typeProvider = (ITypeProvider)manager.GetService(typeof(ITypeProvider));

                    IDisposable localContextScope = (WorkflowCompilationContext.Current == null ? WorkflowCompilationContext.CreateScope(manager) : null); 
                    try
                    { 
                        RuleValidation ruleValidator = new RuleValidation(activity, typeProvider, WorkflowCompilationContext.Current.CheckTypes); 
                        actualCondition.Validate(ruleValidator);
 
                        ValidationErrorCollection actualConditionErrors = ruleValidator.Errors;

                        if (actualConditionErrors.Count > 0)
                        { 
                            string expressionPropertyName = GetFullPropertyName(manager);
                            string genericErrorMsg = string.Format(CultureInfo.CurrentCulture, Messages.InvalidConditionExpression, expressionPropertyName); 
                            int errorNumber = ErrorNumbers.Error_InvalidConditionExpression; 

                            if (activity.Site != null) 
                            {
                                ValidationError validationError = new ValidationError(genericErrorMsg, errorNumber);
                                validationError.PropertyName = expressionPropertyName + "." + "Expression";
                                validationErrors.Add(validationError); 
                            }
                            else 
                            { 
                                foreach (ValidationError actualError in actualConditionErrors)
                                { 
                                    ValidationError validationError = new ValidationError(genericErrorMsg + " " + actualError.ErrorText, errorNumber);
                                    validationError.PropertyName = expressionPropertyName + "." + "Expression";
                                    validationErrors.Add(validationError);
                                } 
                            }
                        } 
 
                        // Test duplicates
                        foreach (RuleCondition definition in conditionDefinitions) 
                        {
                            if (definition.Name == declarativeCondition.ConditionName && definition != actualCondition)
                            {
                                string message = string.Format(CultureInfo.CurrentCulture, Messages.DuplicateConditions, declarativeCondition.ConditionName); 
                                ValidationError validationError = new ValidationError(message, ErrorNumbers.Error_DuplicateConditions);
                                validationError.PropertyName = GetFullPropertyName(manager) + "." + "ConditionName"; 
                                validationErrors.Add(validationError); 
                            }
                        } 
                    }
                    finally
                    {
                        if (localContextScope != null) 
                        {
                            localContextScope.Dispose(); 
                        } 
                    }
                } 
            }
            else
            {
                string message = string.Format(CultureInfo.CurrentCulture, Messages.InvalidConditionName, "ConditionName"); 
                ValidationError validationError = new ValidationError(message, ErrorNumbers.Error_InvalidConditionName);
                validationError.PropertyName = GetFullPropertyName(manager) + "." + "ConditionName"; 
                validationErrors.Add(validationError); 
            }
            return validationErrors; 
        }
    }
    #endregion
} 

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

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