How to implement custom IComparer to sort a column in WinForms GridControl?
This KB article clearly explains 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.
this.gridControl1.Data.SortByColumn(col,(ListSortDirection)this.gridControl1[0, col].Tag, new StrLenComparer());Me.gridControl1.Data.SortByColumn(col,CType(Me.gridControl1(0, col).Tag, ListSortDirection), New StrLenComparer())Refer to the following code example for a custom IComparer method.
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;
}
}
}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 FunctionThe following
screenshot illustrates the CustomSort IComparer applied
to the Text column.
Sample Links:
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 and WinForms GridControl documentation, and how to quickly get started for configuration specifications.
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