Validator.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / Compiler / Validation / Validator.cs / 1305376 / Validator.cs
                        
                        
                            namespace System.Workflow.ComponentModel.Compiler 
{
    using System;
    using System.Reflection;
    using System.Collections; 
    using System.Collections.Generic;
 
    #region Class Validator 
    public class Validator
    { 
        public virtual ValidationErrorCollection Validate(ValidationManager manager, object obj)
        {
            if (manager == null)
                throw new ArgumentNullException("manager"); 
            if (obj == null)
                throw new ArgumentNullException("obj"); 
 
            return new ValidationErrorCollection();
        } 

 		public virtual ValidationError ValidateActivityChange(Activity activity, ActivityChangeAction action)
		{
			if (activity == null) 
				throw new ArgumentNullException("activity");
 			if (action == null) 
				throw new ArgumentNullException("action"); 

 			return null; 
 		}

	    public virtual ValidationErrorCollection ValidateProperties(ValidationManager manager, object obj)
        { 
            if (manager == null)
                throw new ArgumentNullException("manager"); 
            if (obj == null) 
                throw new ArgumentNullException("obj");
 
            ValidationErrorCollection errors = new ValidationErrorCollection();

            Activity activity = manager.Context[typeof(Activity)] as Activity;
 
            // Validate all members that support validations.
            Walker walker = new Walker(true); 
            walker.FoundProperty += delegate(Walker w, WalkerEventArgs args) 
            {
                //If we find dynamic property of the same name then we do not invoke the validator associated with the property 
                //Attached dependency properties will not be found by FromName().

                // args.CurrentProperty can be null if the property is of type IList.  The walker would go into each item in the
                // list, but we don't need to validate these items. 
                if (args.CurrentProperty != null)
                { 
                    DependencyProperty dependencyProperty = DependencyProperty.FromName(args.CurrentProperty.Name, args.CurrentProperty.DeclaringType); 
                    if (dependencyProperty == null)
                    { 
                        object[] validationVisibilityAtrributes = args.CurrentProperty.GetCustomAttributes(typeof(ValidationOptionAttribute), true);
                        ValidationOption validationVisibility = (validationVisibilityAtrributes.Length > 0) ? ((ValidationOptionAttribute)validationVisibilityAtrributes[0]).ValidationOption : ValidationOption.Optional;
                        if (validationVisibility != ValidationOption.None)
                        { 
                            errors.AddRange(ValidateProperty(args.CurrentProperty, args.CurrentPropertyOwner, args.CurrentValue, manager));
                            // don't probe into subproperties as validate object inside the ValidateProperties call does it for us 
                            args.Action = WalkerAction.Skip; 
                        }
                    } 
                }
            };

            walker.WalkProperties(activity, obj); 

            return errors; 
        } 

        protected string GetFullPropertyName(ValidationManager manager) 
        {
            if (manager == null)
                throw new ArgumentNullException("manager");
 
            string fullName = string.Empty;
 
            // iterate the properties in the stack starting with the last one 
            int iterator = 0;
            while (manager.Context[iterator] != null) 
            {
                if (manager.Context[iterator] is PropertyValidationContext)
                {
                    PropertyValidationContext propertyValidationContext = manager.Context[iterator] as PropertyValidationContext; 
                    if (propertyValidationContext.PropertyName == string.Empty)
                        fullName = string.Empty;  // property chain broke... dicard properties after break 
                    else if (fullName == string.Empty) 
                        fullName = propertyValidationContext.PropertyName;
                    else 
                        fullName = propertyValidationContext.PropertyName + "." + fullName;
                }
                iterator++;
            } 

            return fullName; 
        } 

 		internal protected ValidationErrorCollection ValidateProperty(PropertyInfo propertyInfo, object propertyOwner, object propertyValue, ValidationManager manager) 
		{
			ValidationErrorCollection errors = new ValidationErrorCollection();

			object[] validationVisibilityAtrributes = propertyInfo.GetCustomAttributes(typeof(ValidationOptionAttribute), true); 
 			ValidationOption validationVisibility = (validationVisibilityAtrributes.Length > 0) ? ((ValidationOptionAttribute)validationVisibilityAtrributes[0]).ValidationOption : ValidationOption.Optional;
			PropertyValidationContext propertyValidationContext = new PropertyValidationContext(propertyOwner, propertyInfo, propertyInfo.Name); 
 			manager.Context.Push(propertyValidationContext); 

 			try 
			{
 				if (propertyValue != null)
				{
					errors.AddRange(ValidationHelpers.ValidateObject(manager, propertyValue)); 
					if (propertyValue is IList)
 					{ 
						PropertyValidationContext childContext = new PropertyValidationContext(propertyValue, null, ""); 
 						manager.Context.Push(childContext);
 
 						try
						{
 							foreach (object child in (IList)propertyValue)
								errors.AddRange(ValidationHelpers.ValidateObject(manager, child)); 
						}
						finally 
 						{ 
							System.Diagnostics.Debug.Assert(manager.Context.Current == childContext, "Unwinding contextStack: the item that is about to be popped is not the one we pushed.");
 							manager.Context.Pop(); 
 						}
					}
 				}
			} 
			finally
			{ 
 				System.Diagnostics.Debug.Assert(manager.Context.Current == propertyValidationContext, "Unwinding contextStack: the item that is about to be popped is not the one we pushed."); 
				manager.Context.Pop();
 			} 

 			return errors;
		}
    } 
    #endregion
} 

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

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