On occasion, you may find that your current formatting options do not suit your particular needs. Furthermore, you may be restricted in the type of formatting that you can use or need a custom formatting option. In these cases, the FormatText Event option can be specified for the NumberFormat property. Choosing this option for a column will cause the FormatText event to fire each time data is about to be displayed in that column. The event allows you to reformat, translate, indent, or do anything you want to the data just prior to display:
Private Sub C1TrueDBGrid1_FormatText(ByVal sender As Object, ByVal e As C1.Win.C1TrueDBGrid.FormatTextArgs) Handles C1TrueDBGrid1.FormatText
End Sub
· C#
private void C1TrueDBGrid1_FormatText(object sender, C1.Win.C1TrueDBGrid.FormatTextArgs e)
{
}
· Delphi
procedure C1TrueDBGrid1_FormatText(sender: System.Object; e: C1.Win.C1TrueDBGrid.FormatTextArgs);
begin
end;
A member of the FormatTextEventArgs object, ColIndex is the column number of the grid to be reformatted. While the Value member contains the current value of the data and also serves as a placeholder for the formatted display value. For example, suppose the first column contains numeric values from 1 to 30, and you wish to display the data as Roman numerals:
Private Sub C1TrueDBGrid1_FormatText(ByVal sender As Object, ByVal e As C1.Win.C1TrueDBGrid.FormatTextEventArgs) Handles C1TrueDBGrid1.FormatText
Dim result As String
If e.ColIndex = 0 Then
' Determine how many X's.
While e.Value >= 10
result = result & "X"
e.Value = e.Value - 10
End While
' Append "digits" 1-9.
Select Case e.Value
Case 1
result = result & "I"
Case 2
result = result & "II"
Case 3
result = result & "III"
Case 4
result = result & "IV"
Case 5
result = result & "V"
Case 6
result = result & "VI"
Case 7
result = result & "VII"
Case 8
result = result & "VIII"
Case 9
result = result & "IX"
End Select
' Change the actual format.
e.Value = result
End If
End Sub
· C#
private void C1TrueDBGrid1_FormatText(object sender, C1.Win.C1TrueDBGrid.FormatTextEventArgs e)
string result;
if ( e.ColIndex = 0 )
{
// Determine how many X's.
while ( e.Value >= 10 )
{
result = result + "X";
e.Value = e.Value - 10;
}
// Append "digits" 1-9.
switch (e.Value)
{
case 1;
result = result + "I";
case 2;
result = result + "II";
case 3;
result = result + "III";
case 4;
result = result + "IV";
case 5;
result = result + "V";
case 6;
result = result + "VI";
case 7;
result = result + "VII";
case 8;
result = result + "VIII";
case 9;
result = result + "IX";
}
// Change the actual format.
e.Value = result;
}
}
· Delphi
procedure TWinForm.C1TrueDBGrid1_FormatText(sender: System.Object; e: C1.Win.C1TrueDBGrid.FormatTextEventArgs);
var
res: string;
val: Integer;
begin
if e.ColIndex = 0 then
begin
res := ‘’;
val := Int32.Parse(e.Value);
// Determine how many X's.
while e.Value >= 10 do
begin
res := res + 'X';
val := val - 10;
end;
// Append "digits" 1-9.
else if (val = 1) then
res := res + 'I';
else if (val = 2) then
res := res + 'II';
else if (val = 3) then
res := res + 'III';
else if (val = 4) then
res := res + 'IV';
else if (val = 5) then
res := res + 'V';
else if (val = 6) then
res := res + 'VI';
else if (val = 7) then
res := res + 'VII';
else if (val = 8) then
res := res + 'VIII';
else if (val = 9) then
res := res + 'IX';
// Change the actual format.
e.Value := res;
end;
end;
Since the FormatText event has fewer restrictions than other formatting techniques, you can always use it to gain full control over the textual content of any value displayed in the grid.
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