Comparing object properties in c# [closed]

Answer 1

This works even if the objects are different. you could customize the methods in the utilities class maybe you want to compare private properties as well...

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class ObjectA
{
    public string PropertyA { get; set; }
    public string PropertyB { get; set; }
    public string PropertyC { get; set; }
    public DateTime PropertyD { get; set; }

    public string FieldA;
    public DateTime FieldB;
}

class ObjectB
{
    public string PropertyA { get; set; }
    public string PropertyB { get; set; }
    public string PropertyC { get; set; }
    public DateTime PropertyD { get; set; }


    public string FieldA;
    public DateTime FieldB;


}

class Program
{
    static void Main(string[] args)
    {
        // create two objects with same properties
        ObjectA a = new ObjectA() { PropertyA = "test", PropertyB = "test2", PropertyC = "test3" };
        ObjectB b = new ObjectB() { PropertyA = "test", PropertyB = "test2", PropertyC = "test3" };

        // add fields to those objects
        a.FieldA = "hello";
        b.FieldA = "Something differnt";

        if (a.ComparePropertiesTo(b))
        {
            Console.WriteLine("objects have the same properties");
        }
        else
        {
            Console.WriteLine("objects have diferent properties!");
        }


        if (a.CompareFieldsTo(b))
        {
            Console.WriteLine("objects have the same Fields");
        }
        else
        {
            Console.WriteLine("objects have diferent Fields!");
        }

        Console.Read();
    }
}

public static class Utilities
{
    public static bool ComparePropertiesTo(this Object a, Object b)
    {
        System.Reflection.PropertyInfo[] properties = a.GetType().GetProperties(); // get all the properties of object a

        foreach (var property in properties)
        {
            var propertyName = property.Name;

            var aValue = a.GetType().GetProperty(propertyName).GetValue(a, null);
            object bValue;

            try // try to get the same property from object b. maybe that property does
                // not exist! 
            {
                bValue = b.GetType().GetProperty(propertyName).GetValue(b, null);
            }
            catch
            {
                return false;
            }

            if (aValue == null && bValue == null)
                continue;

            if (aValue == null && bValue != null)
                return false;

            if (aValue != null && bValue == null)
               return false;

            // if properties do not match return false
            if (aValue.GetHashCode() != bValue.GetHashCode())
            {
                return false;
            }
        }

        return true;
    }



    public static bool CompareFieldsTo(this Object a, Object b)
    {
        System.Reflection.FieldInfo[] fields = a.GetType().GetFields(); // get all the properties of object a

        foreach (var field in fields)
        {
            var fieldName = field.Name;

            var aValue = a.GetType().GetField(fieldName).GetValue(a);

            object bValue;

            try // try to get the same property from object b. maybe that property does
            // not exist! 
            {
                bValue = b.GetType().GetField(fieldName).GetValue(b);
            }
            catch
            {
                return false;
            }

            if (aValue == null && bValue == null)
               continue;

            if (aValue == null && bValue != null)
               return false;

            if (aValue != null && bValue == null)
               return false;


            // if properties do not match return false
            if (aValue.GetHashCode() != bValue.GetHashCode())
            {
                return false;
            }
        }

        return true;
    }


}