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Compare two different Lists

Hi ,

I have the following two classes with properties

Class ABC
{
Property int code{get;set;}
Property string name {get;set;}
}
Class DEF
{
Property int code{get;set;}
Property string name {get;set;}
}

Now I have List< ABC> and List < DEF>
And I want to compare these two lists and get the values of DEF which is not present in ABC, I have used following code to achieve that
var matchedAccounts =
DEF.Where(x => ABC.Any(y => y.Code == x. Code)).ToList();

var unMatchedAccounts = DEF.Except(matchedAccounts).ToList();

Is this the right way , or will have any impact on performance, if so what is the right way , please guide me.

Rafiq J

Use Except to compare the two list: Think abc is list1 & cde is the List.

var firstNotSecond = list1.Except(list2).ToList();
var secondNotFirst = list2.Except(list1).ToList();

It works faster than

var list1 = list.Where(i => !list2.Contains(i)).ToList();
var list2 = list2.Where(i => !list.Contains(i)).ToList();

Like if it's works.
any doubt post your comments

Michael Fowler

To ensure that the objects compare correctly using either of the methods discussed you should also implement the IEquatable<T> generic interface.

Class ABC  : IEquatable<ABC>
{
 Property int code{get;set;}
Property string name {get;set;}

    public bool Equals(Product other)
    {
        if (Object.ReferenceEquals(other, null)) return false;
        if (Object.ReferenceEquals(this, other)) return true;
        return Code.Equals(other.Code) && Name.Equals(other.Name);
    }

    public override int GetHashCode()
    {
        int hashProductName = Name == null ? 0 : Name.GetHashCode();
        int hashProductCode = Code.GetHashCode();
        return hashProductName ^ hashProductCode;
    }
}

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https://msdn.microsoft.com/en-us/library/vstudio/bb300779(v=vs.100).aspx

praveen1981

ASKER

Hi Rafiq J,

I am talking about two different types(class objects), but it seems the answer which you have provided will work for the same type of objects in list

praveen1981

ASKER

Hi Michael74

Is there any way in linq to achieve my task.

ASKER CERTIFIED SOLUTION

Michael Fowler

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praveen1981

ASKER

Thanks.