I have this piece of code that I usually use to update/delete/create items

HashSet<int> current = new HashSet<int>(diagram.Links.Select(lnk => lnk.IDInput);
HashSet<int> received = new HashSet<int>(d.Links.Select(lnk => lnk.IDInput));
IEnumerable<int> delete = current.Except(received);
IEnumerable<int> new = received.Except(current);

And it works perfect when my list works with one ID but it this case I want to do something like diagram.Links.Select(lnk => lnk.IDInput AND lnk.IDOutput) Is it even possible or should I use Where instead?

Thank you in advance

CodePudding user response：

I would choose one of these 3 options

1. Create a Dynamic object

    diagram.Links.Select(lnk => new {lnk.IDInput, lnk.IDOutput})
   

2. Create a Touple object

    diagram.Links.Select(lnk => (lnk.IDInput, lnk.IDOutput))
   

3. Create a Class / Struct and use it as the returned object

    public class IDHolder
    {
        public string IDInput;
        public string IDOutput;
    }
   
    diagram.Links.Select(lnk => new IDHolder() {IDInput = lnk.IDInput, IDOutput = lnk.IDOutput}))
   

All three would work, the latter is the most coherent in my taste, but choose whatever works best for you.

CodePudding user response：

For not change the other logic in your code you can simply use Concat like this:

HashSet<int> current = new HashSet<int>(diagram.Links.Select(lnk => lnk.IDInput)
.Concat(diagram.Links.Select(lnk => lnk.IDOutput)));

HashSet<int> received = new HashSet<int>(d.Links.Select(lnk => lnk.IDInput)
.Concat(d.Links.Select(lnk => lnk.IDOutput)));