Object array problem

[CrazyCoder26]

Hi I have a problem as described below : <pre> object[] obj1={1,"hello"}; object[] obj2={1,"hello"}; if(obj1.Equals(obj2)) { return true; } else { return false; } </pre> According to me, it should return true. But it is returning false (I know I am wrong). But why?????

CC26

[dan sh]

Equals method will return true only if both the objects refer to same memory location. Otherwise false. Here obj1 and obj2 are referring to two different memory locations. Hence you are getting return value as false.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

[CrazyCoder26]

Thanks for the reply danish. What if instead of Equal I did if(obj1==obj2)?

CC26

[dan sh]

That would also give the same result.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

[Blue_Boy]

Try this: if (obj1.Length != obj2.Length) { return false; } else { return true; for (int i=0; i < obj1.Length; i++) { if (obj1[i] != obj2[i]) { return false; break; } } }

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[ThatsAlok]

CrazyCoder26 wrote:

But it is returning false (I know I am wrong).

Actually you comparing memory location thats why you it return false. consider the case :- When you create object, the memory is created in Heap and it's heap memory reference is stored in stack. So object as such nothing but variable containing address location, so when you compare two object, they bound to differ on memory address, so the answer

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[Lost User]

Both == and Equals perform a reference comparison rather than value comparison. Rewrite your code like this and find out what happens:

object[] obj1={1,"hello"};
object[] obj2=obj1;

[vtchris peterson]

If you are wanting to compare the contents of the arrays, then consider the following code:

  /// <summary>
  /// Compare 2 arrays for equality.
  /// </summary>
  /// <param name="data1">Array 1.</param>
  /// <param name="data2">Array 2.</param>
  /// <returns><c>true</c> if equal, <c>false</c> otherwise.</returns>
  public static bool CompareArrays<T>(T\[\] data1, T\[\] data2)
  {
     // If both are null, they're equal
     if ((data1 == null) && (data2 == null))
     {
        return true;
     }
     // If either but not both are null, they're not equal
     if ((data1 == null) || (data2 == null))
     {
        return false;
     }
     if (data1.Length != data2.Length)
     {
        return false;
     }
     for (int i = 0; i < data1.Length; i++)
     {
        if (!data1\[i\].Equals(data2\[i\]))
        {
           return false;
        }
     }
     return true;
  }

[vtchris peterson]

Uh, that would return true for any case where obj1 and obj2 are the same length.

[Lost User]

A little bit wrong, maybe it should look like this:

if (obj1.Length != obj2.Length)
{
return false;
}
else
{
for (int i=0; i < obj1.Length; i++)
{
if (!object.Equals(obj1[i], obj2[i]))
{
return false;
}
}
return true;
}

[Blue_Boy]

Yes,you are right,I just couldn't find a bit free time to modify my answer. Thanks for correction.

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I Love T-SQL "Don't torture yourself,let the life to do it for you." If my post helps you kindly save my time by voting my post. www.aktualiteti.com