C# Using Enumerable Range and Except with custom class to determine missing sequence number
- by Jon
I have a List<MyClass>
The class is like this:
private class MyClass
{
public string Name{ get; set; }
public int SequenceNumber { get; set; }
}
I want to work out what Sequence numbers might be missing. I can see how to do this here however because this is a class I am unsure what to do?
I think I can handle the except method ok with my own IComparer but the Range method I can't figure out because it only excepts int so this doesn't compile:
Enumerable.Range(0, 1000000).Except(chqList, MyEqualityComparer<MyClass>);
Here is the IComparer:
public class MyEqualityComparer<T> : IEqualityComparer<T> where T : MyClass
{
#region IEqualityComparer<T> Members
public bool Equals(T x, T y)
{
return (x == null && y == null) || (x != null && y != null && x.SequenceNumber.Equals(y.SequenceNumber));
}
/// </exception>
public int GetHashCode(T obj)
{
if (obj == null)
{
throw new ArgumentNullException("obj");
}
return obj.GetHashCode();
}
#endregion
}
