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Custom Rule Engine in WPF - MVVM

, 11 Sep 2010
Custom Rule Engine approach which can evaluate complex combinations of business rules. A sample application is provided in WPF following the MVVM pattern.
using System.Collections.Generic;

namespace CustomRulesMVVM.Models
    class CustomRule:IRule
        #region Members
        private const string COUNTRY = "COUNTRY";
        private const string CITY = "CITY";
        private const string STATE = "STATE"; 
        Country country;
        City city;
        State state;

        #region Properties
        public bool IsSelected { get; set; }
        public string SelectedItem { get; set; }        
        public string CodeLHS { get; set; }
        public string  Operator { get; set; }
        public string  ValueRHS { get; set; }
        public int Source { get; set; }
        public string RuleJoinOperator { get; set; }
        public int? RuleSeqNum { get; set; }       
        public string RuleDescription { get; set; }

        #region Public methods
        /// <summary>
        /// This function evluates each custom rule by calling method in RuleHelper
        /// </summary>
        /// <param name="collection"></param>
        /// <returns></returns>
        public bool Eval(Dictionary<string, object> collection)
            if (collection.ContainsKey(COUNTRY))
                country = (Country)collection[COUNTRY];
            if (collection.ContainsKey(CITY))
                city = (City)collection[CITY];
            if (collection.ContainsKey(STATE))
                state = (State)collection[STATE];            

            switch (this.Source)
                case 1 :
                    this.IsSelected = RuleHelper.EvaluatePropertyValue(this,country);
                case 2:
                    this.IsSelected = RuleHelper.EvaluatePropertyValue(this, city);
                case 3:
                    this.IsSelected = RuleHelper.EvaluatePropertyValue(this, state);
                    this.IsSelected = false;
            return this.IsSelected;

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About the Author

Renil Joy, Bangalore
Software Developer (Senior) Societe Generale
India India
I am a .Net developer, currently working with Societe Generale Global Solution Centre, Bangalore and was previously with Cognizant.I have more than 5 years of .Net experience in BFSI domain. I am an experienced developer in C#, VB.Net, Silverlight, WPF, WCF, LINQ, Entity Framework, NHibernate, ASP.Net and SQL Server.

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