Spread Windows Forms 18 Product Documentation

Using a Text Length Validator

You can create a validator that checks to see if the text length is within a specified range.

A validation error occurs if the value is not valid. You can also create an action, such as adding a backcolor to the cell, that lets the user know the value is invalid.

Use the TextLengthValidator class to create the validator. Specify a notification type such as CellStyleNotify. Then use the AddValidators method to add the validator to a cell range.

The following image displays an invalid backcolor in the cell.

Text length validator

Using Code

The following example displays an invalid backcolor if the cell value contains more than six characters.

//Type a text string that contains more than 6 characters in cell 1,1 to see the error notification
FarPoint.Win.Spread.CellStyleNotify cnotify = new FarPoint.Win.Spread.CellStyleNotify();
cnotify.InvalidCellStyle.BackColor = Color.Aqua;
FarPoint.Win.Spread.TextLengthValidator tvalid = new FarPoint.Win.Spread.TextLengthValidator();
tvalid.LengthUnit = FarPoint.Win.Spread.LengthUnit.Char;
tvalid.MaximumLength = 6;
tvalid.MinimumLength = 0;
tvalid.NullIsValid = true;
tvalid.Actions.Add(cnotify);
fpSpread1.Sheets[0].AddValidators(new FarPoint.Win.Spread.Model.CellRange(1, 1, 1, 1), tvalid);

'Type a text string that contains more than 6 characters in cell 1,1 to see the error notification
Dim cnotify As New FarPoint.Win.Spread.CellStyleNotify()
notify.InvalidCellStyle.BackColor = Color.Aqua
Dim tvalid As New FarPoint.Win.Spread.TextLengthValidator()
tvalid.LengthUnit = FarPoint.Win.Spread.LengthUnit.Char
tvalid.MaximumLength = 6
tvalid.MinimumLength = 0
tvalid.NullIsValid = True
tvalid.Actions.Add(cnotify)
fpSpread1.Sheets(0).AddValidators(New FarPoint.Win.Spread.Model.CellRange(1, 1, 1, 1), tvalid)

Using a Text Length Validator

Using Code

See Also