Datagrid Multiple Column Sort

Hello there,

I have a table with two columns, date and time. I am using the following code to sort in descending date order.

VB Code:

If historydataGrid.Rows.Count > 0 Then
            'if there are rows, sort by date (most recent first)
            historydataGrid.Sort(historydataGrid.Columns(0), System.ComponentModel.ListSortDirection.Descending)
        End If

Where Columns(0) is the Date. However, how difficult is it for me to then sort secondarily by time. So that the grid will sort by most recent date and time.. Working down from the most recent time on the most recent date, and then moving backwards towards the oldest date with the oldest time.

Cheers!

you'd need to use an IComparer:

vb Code:

Public Class comparer
    Implements IComparer
 
    Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer Implements System.Collections.IComparer.Compare
        Dim xRow As DataGridViewRow = DirectCast(x, DataGridViewRow)
        Dim yRow As DataGridViewRow = DirectCast(y, DataGridViewRow)
 
        If Date.ParseExact(yRow.Cells("dateField").Value.ToString, "dd/MM/yyyy", CultureInfo.CurrentCulture) > Date.ParseExact(xRow.Cells("dateField").Value.ToString, "dd/MM/yyyy", CultureInfo.CurrentCulture) Then
            Return 1
        ElseIf Date.ParseExact(yRow.Cells("dateField").Value.ToString, "dd/MM/yyyy", CultureInfo.CurrentCulture) < Date.ParseExact(xRow.Cells("dateField").Value.ToString, "dd/MM/yyyy", CultureInfo.CurrentCulture) Then
            Return -1
        Else
            Return TimeSpan.Parse(yRow.Cells("timeField").Value.ToString).CompareTo(TimeSpan.Parse(xRow.Cells("timeField").Value.ToString))
        End If
 
    End Function
 
End Class

add the comparer to your project + use it like this:

vb Code:

DataGridView1.Sort(New comparer)

Thanks Paul. I feared I would have to use this class. I really dislike it. Hey-ho. Thanks for the info. The forums won't let me give you any more rep at the moment. :/

Another idea is to sort on the data, assign your DataTable to a BindingSource which becomes the DataSource for the DataGridView. Set the sort property of the BindingSource to multiple columns i.e. BindingSource1.Sort = "Col1,Col2 desc"