Adding index field to LINQ List <T> results using C#

Answer 1

It looks like you need to assign _grouppedResto to an anonymous type as in:

var yourSequence = _groupedResto.Select((value, index) => new { index = index, value = value });
dgvHeader.DataSource = yourSequence;

I'd be happy to help with any particulars you care to provide. Good luck, hope this helped :)

Answer 2

To combine the index with the properties of your list element you need to change your select statement into something like this:

_grouppedResto.Select(
  (value, index) => new {
    index = index, propertyA = value.propertyA, propertyB = value.propertyB
  }
);

Answer 3

Well, I use this way to solve this... (I think is the worst way, cause you have to modified the domain class)

public class RGVCAFAC
    {
        public int index { get; set; }
        public string CODEAUX { get; set; }

        public string FECRGV { get; set; }
        public string TDORGV { get; set; }
        public string MONRGV { get; set; }
        public string NDORGV { get; set; }
        public string RUCCLI { get; set; }
        public string RAZCLI { get; set; }
        public string CDCRGV { get; set; }
        public string TERRGV { get; set; }
        public string PDSRGV { get; set; }
        public double VVTRGVS { get; set; }
        public double IGVRGVS { get; set; }
        public double TOTRGVS { get; set; }
        public string TCARGV { get; set; }
        public double VVTRGVD { get; set; }
        public double IGVRGVD { get; set; }
        public double TOTRGVD { get; set; }
        public string PACEST { get; set; }

        public string CODUNI { get; set; }

        public string DIRCLI { get; set; }
        public string TELCLI { get; set; }
        public int PFLAG { get; set; }


        //I have to add the following, so generators are useless :(


        public RGVCAFAC()
        {
        }

        public RGVCAFAC(RGVCAFAC x)
        {
            this.CODEAUX = x.CODEAUX;
            this.FECRGV = x.FECRGV;
            this.TDORGV = x.TDORGV;
            this.MONRGV = x.MONRGV;
            this.RUCCLI = x.RUCCLI;
            this.RAZCLI = x.RAZCLI;
            this.CDCRGV = x.CDCRGV;
            this.TERRGV = x.TERRGV;
            this.PDSRGV = x.PDSRGV;
            this.VVTRGVS = x.VVTRGVS;
            this.IGVRGVS = x.IGVRGVS;
            this.TOTRGVS = x.TOTRGVS;
            this.TCARGV = x.TCARGV;
            this.VVTRGVD = x.VVTRGVD;
            this.IGVRGVD = x.IGVRGVD;
            this.TOTRGVD = x.TOTRGVD;
            this.PACEST = x.PACEST;
            this.CODUNI = x.CODUNI;
            this.DIRCLI = x.DIRCLI;
            this.TELCLI = x.TELCLI;
            this.PFLAG = x.PFLAG;
        }
    }

and finally :

var yourSequence = _grouppedResto.
                    Select((value, index) => new RGVCAFAC(value) { index = index+1, rgvcafac = value }).ToList(); //need to begin on 1 not on 0
                dgvCabecera.DataSource = yourSequence;

Answer 4

int theIndex = 1;

foreach(var x in _grouppedResto)
{
  x.index = theIndex;
  theIndex += 1;
}