C#: Split string and assign result to multiple string variables

You can use Tuples (added in .Net 4). Tuples in MSDN

This:

public class MySplitter
{
     public MySplitter(string split)
     {
         var results = split.Split(',');
         NamedPartA = results[0];
         NamedpartB = results[1];
     }

     public string NamedPartA { get; private set; }
     public string NamedPartB { get; private set; }
}

Could be achieved with something like this:

public Tuple<string,string> SplitIntoVars(string toSplit)
{
   string[] split = toSplit.Split(',');
   return Tuple.Create(split[0],split[1]);
}

With a Tuple you can use:

var x = SplitIntoVars(arr);
// you can access the items like this:    x.Item1 or x.Item2 (and x.Item3 etc.)

You can also create a Tuple for using Tuple<string,int> etc.

Also... I don't really like out parameters, so you emulate returning multiple values using a Tuple (and obviously, also of varying types). this:

public void SplitIntoVariables(string input, out a, out b, out c)
{
    string pieces[] = input.Split(',');
    a = pieces[0];
    b = pieces[1];
    c = pieces[2];
}

turns into this:

public Tuple<string,string,string> SplitIntoVariables(string[] input)
    {
        string pieces[] = input.Split(',');
        return Tuple.Create(pieces[0],pieces[1],pieces[2]);
    }

Other (more imaginative) options could be creating an ExpandoObject (dynamic) that holds your values (something akin to ViewBag in ASP.NET MVC)

I agree. Hiding the split in an Adapter class seems like a good approach and communicates your intent rather well:

public class MySplitter
{
     public MySplitter(string split)
     {
         var results = string.Split(',');
         NamedPartA = results[0];
         NamedpartB = results[1];
     }

     public string NamedPartA { get; private set; }
     public string NamedPartB { get; private set; }
}