test if two objects are equal field by field (with deep inspection of each field) - CSharp System

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Description

test if two objects are equal field by field (with deep inspection of each field)

Demo Code


using System.Reflection;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;/*from w w w.ja v  a 2 s  . c o m*/

public class Main{
        /// <summary>
      /// test if two objects are equal field by field (with deep inspection of each field)
      /// </summary>
      /// <param name="o1"></param>
      /// <param name="o2"></param>
      /// <returns></returns>
      public static bool DeepEquals(object o1, object o2)
      {
         if (o1 == o2)
         {
            // reference equal, so nothing else to be done
            return true;
         }
         Type t1 = o1.GetType();
         Type t2 = o2.GetType();
         if (t1 != t2)
         {
            return false;
         }
         if (t1.IsArray)
         {
            // it's not too hard to support thesse if needed
            if (t1.GetArrayRank() > 1 || IsNonZeroBaedArray(t1))
               throw new InvalidOperationException("Complex arrays not supported");

            // this is actually pretty fast; it allows using fast ldelem and stelem opcodes on
            // arbitrary array types without emitting custom IL
            var method = ArrayEqualsGeneric.MakeGenericMethod(new Type[] { t1.GetElementType() });
            return (bool)method.Invoke(null, new object[] { o1, o2 });
         }
         else if (t1.IsPrimitive)
         {
            return o1.Equals(o2);
         }
         else
         {
            foreach (var field in GetAllFields(t1))
            {
               if (!DeepEquals(field.GetValue(o1), field.GetValue(o2)))
                  return false;
            }
            return true;
         }
      }
}

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