How to implement custom IComparer to sort a column in WinForms GridControl?
This KB article clearly explains on how to implement the custom IComparer to sort a column in the WinForms GridControl.
Solution
The GridData's sortbycolumn method accepts an IComparer object. You can pass your custom IComparer to this method. The following code example sorts the 4th column by string length.
C#
this.gridControl1.Data.SortByColumn(col,(ListSortDirection)this.gridControl1[0, col].Tag, new StrLenComparer());
VB
Me.gridControl1.Data.SortByColumn(col,CType(Me.gridControl1(0, col).Tag, ListSortDirection), New StrLenComparer())
Refer to the following code example for custom IComparer method.
C#
public class StrLenComparer : IComparer
{
// Implementation of IComparer
public int Compare(object x, object y)
{
if(x == null && y == null)
return 0;
else if(x == null)
return 1;
else if(y == null)
return -1;
else
{
if(x.ToString().Length > y.ToString().Length)
return -1;
if(x.ToString().Length < y.ToString().Length)
return 1;
else
return 0;
}
}
}
VB
Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer Implements IComparer.Compare If x Is Nothing AndAlso y Is Nothing Then Return 0 ElseIf x Is Nothing Then Return 1 ElseIf y Is Nothing Then Return -1 Else If x.ToString().Length > y.ToString().Length Then Return -1 End If If x.ToString().Length < y.ToString().Length Then Return 1 Else Return 0 End If End If End Function
The following screenshot illustrates the CustomSort IComparer applied to the Text column.
Sample Link:
C#: Sorting CS
VB: Sorting VB
Conclusion
I hope you enjoyed learning about how to implement the custom IComparer to sort a column in the WinForms GridControl.
You can refer to our WinForms GridControl feature tour page to know about its other groundbreaking feature representations. You can also explore our WinForms GridControl documentation to understand how to create and manipulate data.
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