Distinct() with lambda?

Question

Right, so I have an enumerable and wish to get distinct values from it.

Using System.Linq, there\'s of course an extension method called Distinct<

Answer 1

Something I have used which worked well for me.

/// 

/// A class to wrap the IEqualityComparer interface into matching functions for simple implementation
/// 
/// The type of object to be compared
public class MyIEqualityComparer : IEqualityComparer
{
    /// 

    /// Create a new comparer based on the given Equals and GetHashCode methods
    /// 
    /// The method to compute equals of two T instances
    /// The method to compute a hashcode for a T instance
    public MyIEqualityComparer(Func equals, Func getHashCode)
    {
        if (equals == null)
            throw new ArgumentNullException("equals", "Equals parameter is required for all MyIEqualityComparer instances");
        EqualsMethod = equals;
        GetHashCodeMethod = getHashCode;
    }
    /// 

    /// Gets the method used to compute equals
    /// 
    public Func EqualsMethod { get; private set; }
    /// 

    /// Gets the method used to compute a hash code
    /// 
    public Func GetHashCodeMethod { get; private set; }

    bool IEqualityComparer.Equals(T x, T y)
    {
        return EqualsMethod(x, y);
    }

    int IEqualityComparer.GetHashCode(T obj)
    {
        if (GetHashCodeMethod == null)
            return obj.GetHashCode();
        return GetHashCodeMethod(obj);
    }
}