commonrules.cs

改程序能够查询课程表

                if (e.Description == string.Empty)
                {
                    e.Description = string.Format("{0} exceed the maximum number of words", e.FriendlyName, text1);
                }
                return false;
            }
            return true;
        }

        #endregion

        #region RegexIsMatch

        /// <summary>
        /// Rule ensuring a String value is matching
        /// a specified regular expression.
        /// </summary>
        /// <param name="target">Object containing the data to validate.</param>
        /// <param name="e"><see cref="ValidationRuleArgs"/> containing the information about the object to be validated, must be of type RegexRuleArgs</param>
        /// <returns>False if the rule is broken; true otherwise.</returns>
        /// <remarks>
        /// This implementation uses late binding, and will only work
        /// against String property values.
        /// </remarks>
        public static bool RegexIsMatch(object target, ValidationRuleArgs e)
        {
            RegexRuleArgs args = e as RegexRuleArgs;
            if (args != null)
            {
                string expression = args.Expression;

                PropertyInfo p = target.GetType().GetProperty(e.PropertyName);

                if (p != null)
                {
                    if (p.PropertyType == typeof(string))
                    {
                        string value = (string)p.GetValue(target, null);

                        if (value == null || !Regex.IsMatch(value, expression))
                        {
                            if (string.IsNullOrEmpty(e.Description)) e.Description = String.Format("{0} is not valid.", e.FriendlyName);
                            return false;
                        }
                        return true;
                    }
                    else
                    {
                        throw new ArgumentException(string.Format("Property \"{0}\" is not of type String.", e.PropertyName));
                    }
                }
                else
                {
                    throw new ArgumentException(string.Format("Property \"{0}\" not found on object \"{1}\"", e.PropertyName, target.GetType().ToString()));
                }
            }
            else
            {
                throw new ArgumentException("Invalid ValidationRuleArgs. e must be of type RegexRuleArgs.");
            }

        }

        /// <summary>
        /// Class used with the <see cref="RegexIsMatch"/>.
        /// </summary>
        public class RegexRuleArgs : ValidationRuleArgs
        {
            private string _expression;

            /// <summary>
            /// The Regular expression that the string have to match.
            /// </summary>
            public string Expression
            {
                get { return _expression; }
            }

            /// <summary>
            /// Initializes a new instance of the RegexRuleArgs class.
            /// </summary>
            /// <param name="propertyName">Property to validate</param>
			/// <param name="friendlyName">Friendly name to use in the validation error text.</param>
            /// <param name="expression">The Regular expression that the property have to match</param>
            public RegexRuleArgs(string propertyName, string friendlyName, string expression)
                : base(propertyName, friendlyName)
            {
                _expression = expression;
            }

            /// <summary>
            /// Initializes a new instance of the RegexRuleArgs class.
            /// </summary>
            /// <param name="propertyName">Property to validate</param>
            /// <param name="expression">The Regular expression that the property have to match</param>
            public RegexRuleArgs(string propertyName, string expression)
                : base(propertyName)
            {
                _expression = expression;
            }

            /// <summary>
            /// Return a string representation of the object.
            /// </summary>
            public override string ToString()
            {
                return base.ToString() + "!" + _expression;
            }
        }

        #endregion

        #region CompareValues

        /// <summary>
        /// Generic rule that determines if an object's property is less than a particular value.
        /// </summary>
        /// <typeparam name="T">Datatype of the property to validate</typeparam>
        /// <param name="target">Object containing the data to validate.</param>
        /// <param name="e"><see cref="ValidationRuleArgs"/> containing the information about the object to be validated.</param>
        /// <returns>False if the rule is broken; true otherwise.</returns>
        public static bool LessThanValue<T>(object target, ValidationRuleArgs e)
        {
            return CompareValues<T>(target, e as CompareValueRuleArgs<T>, CompareType.LessThan);
        }

        /// <summary>
        /// Generic rule that determines if an object's property is less than or equal to a particular value.
        /// </summary>
        /// <typeparam name="T">Datatype of the property to validate</typeparam>
        /// <param name="target">Object containing the data to validate.</param>
        /// <param name="e"><see cref="ValidationRuleArgs"/> containing the information about the object to be validated.</param>
        /// <returns>False if the rule is broken; true otherwise.</returns>
        public static bool LessThanOrEqualToValue<T>(object target, ValidationRuleArgs e)
        {
            return CompareValues<T>(target, e as CompareValueRuleArgs<T>, CompareType.LessThanOrEqualTo);
        }

        /// <summary>
        /// Generic rule that determines if an object's property is equal to a particular value.
        /// </summary>
        /// <typeparam name="T">Datatype of the property to validate</typeparam>
        /// <param name="target">Object containing the data to validate.</param>
        /// <param name="e"><see cref="ValidationRuleArgs"/> containing the information about the object to be validated.</param>
        /// <returns>False if the rule is broken; true otherwise.</returns>
        public static bool EqualsValue<T>(object target, ValidationRuleArgs e)
        {
            return CompareValues<T>(target, e as CompareValueRuleArgs<T>, CompareType.EqualTo);
        }

        /// <summary>
        /// Generic rule that determines if an object's property is greater than a particular value.
        /// </summary>
        /// <typeparam name="T">Datatype of the property to validate</typeparam>
        /// <param name="target">Object containing the data to validate.</param>
        /// <param name="e"><see cref="ValidationRuleArgs"/> containing the information about the object to be validated.</param>
        /// <returns>False if the rule is broken; true otherwise.</returns>
        public static bool GreaterThanValue<T>(object target, ValidationRuleArgs e)
        {
            return CompareValues<T>(target, e as CompareValueRuleArgs<T>, CompareType.GreaterThan
               );
        }

        /// <summary>
        /// Generic rule that determines if an object's property is greater than or equal to a particular value.
        /// </summary>
        /// <typeparam name="T">Datatype of the property to validate</typeparam>
        /// <param name="target">Object containing the data to validate.</param>
        /// <param name="e"><see cref="ValidationRuleArgs"/> containing the information about the object to be validated.</param>
        /// <returns>False if the rule is broken; true otherwise.</returns>
        public static bool GreaterThanOrEqualToValue<T>(object target, ValidationRuleArgs e)
        {
            return CompareValues<T>(target, e as CompareValueRuleArgs<T>, CompareType.GreaterThanOrEqualTo);
        }

        /// <summary>
        /// Private method that compares a property value with a specified value.
        /// </summary>
        /// <typeparam name="T">Datatype of the property to validate.</typeparam>
        /// <param name="target">Object containing the data to validate.</param>
        /// <param name="e"><see cref="ValidationRuleArgs"/> containing the information about the object to be validated.</param>
        /// <param name="compareType"><see cref="CompareType"/> defining the type of comparison that will be made.</param>
        /// <returns></returns>
        private static bool CompareValues<T>(object target, CompareValueRuleArgs<T> e, CompareType compareType)
        {
            bool result = true;

            if (e != null)
            {
                T compareValue = e.CompareValue;

                PropertyInfo p = target.GetType().GetProperty(e.PropertyName);

                T value;

                //if (p.PropertyType.Name.Equals(typeof(Nullable<>).Name))
                //{
                //}
                try
                {
                    value = (T)p.GetValue(target, null);
                }
                catch (Exception)
                {
                    return true;
                }

                // if the property is read from a nullable type, then a null valid is considered as allowed
                if (p.PropertyType.Name.Equals(typeof(Nullable<>).Name) && value == null)
                {
                    return true;
                }

                int res = Comparer.DefaultInvariant.Compare(value, compareValue);

                switch (compareType)
                {
                    case CompareType.LessThanOrEqualTo:
                        result = (res <= 0);

                        if (!result)
                        {
                            if (string.IsNullOrEmpty(e.Description))
                            {
                                e.Description = string.Format("{0} cannot exceed {1}.", e.FriendlyName, compareValue.ToString());
                            }
                        }
                        break;

                    case CompareType.LessThan:
                        result = (res < 0);

                        if (!result)
                        {
                            if (string.IsNullOrEmpty(e.Description))
                            {
                                e.Description = string.Format("{0} must be less than {1}.", e.FriendlyName, compareValue.ToString());
                            }
                        }
                        break;

                    case CompareType.EqualTo:
                        result = (res == 0);

                        if (!result)
                        {
                            if (string.IsNullOrEmpty(e.Description))
                            {
                                e.Description = string.Format("{0} must equal {1}.", e.FriendlyName, compareValue.ToString());
                            }
                        }
                        break;

                    case CompareType.GreaterThan:
                        result = (res > 0);

                        if (!result)
                        {
                            if (string.IsNullOrEmpty(e.Description))
                            {
                                e.Description = string.Format("{0} must exceed {1}.", e.FriendlyName, compareValue.ToString());
                            }
                        }
                        break;

                    case CompareType.GreaterThanOrEqualTo: