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Arif
405
Groupby and sortby with related entities.
posted

I have a custom object collection, which needs to be grouped by and sorted with some properties in the ultraWinGrid (version 8.1).  These objects contain properties namly "createdDate" and "CreatedDetails". I want to group these items with CreatedDate but display the groupheader as createdDetails. Also the groups should be in chronological order of ascending/descending order of the CreatedDate.

How can i achieve this, comparing with one property and displaying another corresponding property as header.

One solution i thought was having a custom class instance within these objects, as described below. I implemented the IComparable Interface, so that it compares with the Date to sort and for display i override the ToString() method. and i say

dataGrid1.DisplayLayout.Bands[ 0 ].SortedColumns.Add( "RecordCreationDetail ", false, true );

but still it compares with the CreatedDetails and groups by string comparision of this and not group by CreatedDate.

Help Please.

 

public class RecordCreationDetail : IComparable<RecordCreationDetail>
{
    private DateTime _createdDate;
    public DateTime CreatedDate
    {
        get
        {
            return _createdDate;
         }
    }
   

    private string _createdDetails = String.Empty;
    public override string ToString()
    {
        return _createdDetails;
    }

    public RecordCreationDetail( DateTime createdDate, string createdDetail )
    {
        _createdDate = createdDate;
        _createdDetails = createdDetail;
    }

    #region IComparable<CreatedDetail> Members
    public int CompareTo( RecordCreationDetail other )
    {
        return DateTime.Compare( this._createdDate, other._createdDate );
    }
    #endregion
}