LINQ to Objects List Difference

Question

I have two EmailAddress generic lists, I wanted a simple way of just getting all the EmailAddress objects that are in List1 that aren\'t in List2.

I\'m thinking a le

Answer 1

Well, I am sure that people will come in here and give you a more hip, LINQesque example, but my employer only allows us to use .NET 2.0, so...

List ret = new List( );
foreach ( EmailAddress address in List1 )
{
    if( !List2.Contains( address ) )
    {
        ret.Add( address );
    }
}

Here is an example of overriding the .Equals method that may apply to you.

class EmailAddress
{
    public string Address { get; set; }

    public override bool Equals( object o )
    {
        EmailAddress toCheck = o as EmailAddress;
        if( toCheck == null ) return false;
        // obviously this is a bit contrived, but you get the idea
        return ( this.Address == toCheck.Address );
    }

    // override GetHashCode as well when overriding Equals
}