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    <p>First of all this is wrong:</p> <pre><code>public bool Equals(MyClass item1, MyClass item2) { return GetHashCode(item1) == GetHashCode(item2); } </code></pre> <p>If the hashcode's are different for sure the corresponding 2 items are different, but if they're equal is not guaranteed that the corresponding 2 items are equal.</p> <p>So this is the correct <code>Equals</code> implementation:</p> <pre><code>public bool Equals(MyClass item1, MyClass item2) { if(object.ReferenceEquals(item1, item2)) return true; if(item1 == null || item2 == null) return false; return item1.MyString1.Equals(item2.MyString1) &amp;&amp; item1.MyString2.Equals(item2.MyString2); } </code></pre> <p>As <a href="https://stackoverflow.com/questions/4340273/intersect-with-a-custom-iequalitycomparer-using-linq/4340318#4340318">Slacks suggested</a> (anticipating me) the code is the following:</p> <pre><code>var Default = new List&lt;MyClass&gt; { new MyClass{MyString1="A",MyString2="A",MyString3="-"}, new MyClass{MyString1="B",MyString2="B",MyString3="-"}, new MyClass{MyString1="X",MyString2="X",MyString3="-"}, new MyClass{MyString1="Y",MyString2="Y",MyString3="-"}, new MyClass{MyString1="Z",MyString2="Z",MyString3="-"}, }; var Good = new List&lt;MyClass&gt; { new MyClass{MyString1="A",MyString2="A",MyString3="+"}, new MyClass{MyString1="B",MyString2="B",MyString3="+"}, new MyClass{MyString1="C",MyString2="C",MyString3="+"}, new MyClass{MyString1="D",MyString2="D",MyString3="+"}, new MyClass{MyString1="E",MyString2="E",MyString3="+"}, }; var wantedResult = Good.Intersect(Default, new MyEqualityComparer()) .Union(Default, new MyEqualityComparer()); // wantedResult: // A A + // B B + // X X - // Y Y - // Z Z - </code></pre>
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    1. CO+1 for helping me a lot with my Equals, but not accepted since it doesn't solve the problem. (I wish I could +2! :-P )
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    2. CONo prob. I was writing the right solution for your intersection problem, but Slacks anticipated me. His is the answer ;-)
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    3. COCheck my edit, It shows Slaks is correct
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