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The RegularExpressionValidator is almost as straightforward. It adds a property where the user can supply a regular expression, and overrides the EvaluateIsValid() method with the code needed to verify the expression against the control text. Here s what it looks like: public class RegularExpressionValidator : BaseValidator { // Store the regular expression. private string validationExpression; public string ValidationExpression { get { return validationExpression; } set { validationExpression = value; } } // Validate with the regular expression. protected override bool EvaluateIsValid() { // Don't validate if empty (that's a job for the RequiredFieldValidator). if (ControlToValidate.Text.Trim().Length == 0) return true; // Evaluate the regular expression. Regex regex = new Regex(validationExpression); return regex.IsMatch(ControlToValidate.Text); } } You ll notice that the RegularExpressionValidator returns true if it encounters a blank value. That s the same way that ASP.NET validators work, and it gives you the flexibility to deal with optional information. Essentially, the RegularExpressionValidator checks a control if it contains a value. If it doesn t contain a value but it should, you need to use both the RegularExpressionValidator and the RequiredFieldValidator on the same control. The final validator you ll consider is the RangeValidator, which checks that a value is between a specified minimum and maximum. The RangeValidator is slightly more complicated, because it needs to support different types of data. In this example, it works for string comparisons, floating point numbers, and integers, although you could easily extend it to work with dates and other values. Here s the enumeration that defines supported data types: public enum ValidationDataType { Integer, Double, Text }

The minimum and maximum values in the RangeValidator are stored as strings until the actual comparison is performed. Here s the basic set of properties for the RangeValidator: public class RangeValidator : BaseValidator { // Determines how the ranges are compared // (numerically or alphabetically). private ValidationDataType validationDataType; public ValidationDataType Type { get { return validationDataType; } set { validationDataType = value; } } // Set a minimum and maximum allowed value. // You could add checks to make sure the minimum value // isn't greater than the maximum value. private string minimumValue = ""; public string MinimumValue { get { return minimumValue; } set { minimumValue = value; } } private string maximumValue = ""; public string MaximumValue { get { return maximumValue; } set { maximumValue = value; } } // Check if the value falls in the range. protected override bool EvaluateIsValid() { ... } } When the EvaluateIsValid() method is triggered, the RangeValidator checks what type of comparison is needed. If necessary, it performs a data type conversion. It also checks for decimals if the value is supposed to be an in integer. protected override bool EvaluateIsValid() { // Don't validate if empty (that's a job for the RequiredFieldValidator). if (ControlToValidate.Text.Trim().Length == 0) return true;

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This attribute tells the compiler to generate the function or value, as well as to generate an expression tree You can then retrieve the quotation using the <@@ @@> operator, which is similar to the quotation operator (note the double ampersand) The following example demonstrates the use of the ReflectedDefinition attribute; notice how you have the quote for inc available, but you can also use the function inc directly:.

switch (validationDataType) { case ValidationDataType.Double: case ValidationDataType.Integer: if (validationDataType == ValidationDataType.Integer) { // Check there's no decimal point. if (ControlToValidate.Text.IndexOf(".") != -1) return false; } try { double valD = Double.Parse(ControlToValidate.Text); return ((valD >= Double.Parse(minimumValue)) && (valD <= Double.Parse(maximumValue)); } catch { // The text can't be converted to a number return false; } case ValidationDataType.Text: string valS = ControlToValidate.Text; return ((String.Compare(valS, minimumValue) >= 0) && (String.Compare(valS, maximumValue) <= 0)); default: return false; } } You could use this model to build many more custom validators. But first, continue to the next section to see these three in action.

4. On the Type a Password screen, shown in Figure 6-5, enter the password you want to use for the account you are creating, and then re-enter it to confirm you have typed it correctly. You will also see here the password requirements, which you may remember from the previous chapter. If you left the password requirements at the default setting, then you have to create a password with a minimum of five characters. If you have changed these requirements, they will be shown here and you need to adhere to them. Click Next.

It s easy to use all of the custom validation components that were built in the last section. All you need to do is compile the class library project; the components it contains are automatically added to the Toolbox in Visual Studio (as described in 9). Then, you can drag validator components into the component tray, one for each control you want to validate. To configure how the validation works, adjust the appropriate properties (like the regular expression or maximum and minimum allowed values) using the Properties window. Figure 18-5 shows several custom validators on a form. Figure 18-6 shows the validators at work at runtime, with no validation code required.

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