Spread Windows Forms 15.0
Spread Windows Forms 15.0 Product Documentation / Developer's Guide / Customizing Interaction in Cells / Using Validation / Using Validation in Cells / Using a Pair Validator
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    Using a Pair Validator
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    You can create a validator that requires matching characters. This can be useful if you enter text that requires matching brackets.

    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 PairCharValidator 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 a cell with an invalid backcolor.

    Pair Validator

    Using Code

    The following example requires matching parentheses to be valid.

    Copy Code
    //The error backcolor is displayed if the text contains a single, non-matching parenthesis
    FarPoint.Win.Spread.CellStyleNotify cnotify = new FarPoint.Win.Spread.CellStyleNotify();
    cnotify.InvalidCellStyle.BackColor = Color.Yellow;
    FarPoint.Win.Spread.PairChar pair = new FarPoint.Win.Spread.PairChar();
    pair.Left = '(';
    pair.Right = ')';
    FarPoint.Win.Spread.PairCharValidator pairvalid = new FarPoint.Win.Spread.PairCharValidator();
    fpSpread1.Sheets[0].AddValidators(new FarPoint.Win.Spread.Model.CellRange(1, 1, 1, 1), pairvalid);
    Copy Code
    'The error backcolor is displayed if the text contains a single, non-matching parenthesis
    Dim cnotify As New FarPoint.Win.Spread.CellStyleNotify()
    cnotify.InvalidCellStyle.BackColor = Color.Yellow
    Dim pair As New FarPoint.Win.Spread.PairChar()
    pair.Left = "("
    pair.Right = ")"
    Dim pairvalid As New FarPoint.Win.Spread.PairCharValidator()
    fpSpread1.Sheets(0).AddValidators(New FarPoint.Win.Spread.Model.CellRange(1, 1, 1, 1), pairvalid)
    See Also