public FrameDR Sel(params string[] columns)
{
var notfound = columns.Where(c => !FrameColumns.ContainsKey(c) || !CustomColumns.ContainsKey(c));
if (notfound.Count() != 0)
{
throw new ArgumentException($"The following columns do not exist in the row: {notfound.Aggregate((s1, s2) => s1 + "," + s2)}.");
}
var frameColumns = FrameColumns.Where(c => columns.Contains(c.Key));
FrameDR dr = null;
if (columns.Count() != 0)
{
dr = new FrameDR(this.Frame, this.Index, frameColumns.Select(c => c.Value).ToArray());
}
else
{
dr = new FrameDR();
}
var customColumns = CustomColumns.Where(c => columns.Contains(c.Key));
foreach (var c in customColumns)
{
dr.Add((c.Key, c.Value));
}
return(dr);
}
public FrameDR Ex(params string[] columns)
{
var dr = new FrameDR(this.Frame, this.Index,
this.FrameColumns.Where(s => !columns.Contains(s.Key)).Select(c => c.Value).ToArray());
foreach (var kv in this.CustomColumns.Where(s => !columns.Contains(s.Key)))
{
dr.Add((kv.Key, kv.Value));
}
return(dr);
}
public FrameDREnumerator(FrameDR r)
{
row = r;
}
