Question

I have the following:

class BaseType {
  public Int32 Id { get; set; }
}

class Option : BaseType {
  public String DisplayName { get; set; }
  public String StoredValue { get; set; }
}

class Container {
  public Collection<BaseType> Options;
}


Container c = new Container();
c.Options.add(new Option() { Id=1, DisplayName="Bob", StoredValue="aaaa"});
c.Options.add(new Option() { Id=2, DisplayName="Dora", StoredValue="bbbb"});
c.Options.add(new Option() { Id=3, DisplayName="Sara", StoredValue="cccc"});

Now, what I want to do is pull out the DisplayName of the specific option that matches StoredValue.

Previously, I’d iterate over the entire collection until I found a match. But, I’d rather have something that looked a bit better…

I got started with

var found = (from c in c.Options
             where ...

And that’s where I’m stuck.

Answer 1

This should do it:

c.Options.OfType<Option>()
 .Where(o => o.StoredValue == "aaaa")
 .Select(o => o.DisplayName)
 .SingleOrDefault();  //or .ToList()