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In F#, operators are defined by libraries rather than built into the language. This module contains some of the language s operators. It also contains some useful operators such as functions, and it is these that I ll be covering here. The module is open by default, which means the user can use these functions with no prefix. Specifically, I will cover the following types of functions: Arithmetic operators: Operators for basic arithmetic operations such as addition and subtraction. Floating-point arithmetic functions: More advanced arithmetic functions including logarithms and trigonometry. Mutable integer functions: Functions on mutable integers. Tuple functions: Functions on tuples. Conversion functions: Functions for converting between primitive types, such as strings, floats and integers.

Table 18-8. Basic Properties of the MaskedTextBox (Continued)

Note Any other user with access to that user s shared folders will still be able to access the files

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These allow you to get strongly typed values from the MaskedTextBox. ValidatingType is a Type object that represents the data type the value should be converted into. When the mask is complete, you can retrieve this value in the TypeValidationCompleted event. If you need to convert a text string into a value and the standard Parse() method can t do it, you can specify a custom FormatProvider to use for the operation. MaskCompleted returns true if there are no empty required characters in the mask (meaning the user has entered the required value). MaskFull returns true if there are no empty characters in the mask at all (including optional values). If your mask doesn t include optional values, MaskCompleted and MaskFull will always be the same. Fires whenever an invalid character is entered. MaskInputRejectedEventArgs provides the position where the error occurred, and a MaskedTextResultHint that may provide more information about why the error occurred. Fires when the mask is complete. At this point, you can check whether the entered value was successfully converted to the ValidatingType, and retrieve it.

As already covered in 2, F# operators can be defined by the programmer, so all the arithmetic operators are defined in the Operators module rather than built into the language Therefore, the majority of operators that you will use in your day-to-day programming in F# are defined in the Operators module I imagine that operators such as + and need little explanation, since their usage is straightforward: let x1 = 1 + 1 let x2 = 1 1 By default, F# operators are unchecked, which means that if a value is too big then it will wrap Therefore, this is the value that will become the smallest possible value, rather than causing an error If you would prefer to use checked operators that raise an exception when a value overflows you can do so by opening the MicrosoftFSharpCoreOperatorsChecked: open MicrosoftFSharpCoreOperators.

One of the more useful features of the MaskedTextBox is the ability to convert the user s information to strongly typed values by setting the ValidatingType property. For example, imagine you ve chosen a mask that expects a date in a standard form recognized by the DateTime.Parse() method. In this case, just set the ValidatingType property like this: maskedTextBox.ValidatingType = typeof(DateTime); Once the mask is complete, you can retrieve the converted value by responding to the TypeValidationCompleted event. At that point, you can check the IsValidInput property of the TypeValidationEventArgs object, and if it s true you can retrieve the properly converted object from the ReturnValue property. Here s an example: private DateTime dateVal; private void maskedTextBox1_TypeValidationCompleted(object sender, System.Windows.Forms.TypeValidationEventArgs e) { if (e.IsValidInput) { // The value can be successfully converted to a date. dateVal = (DateTime)e.ReturnValue; MessageBox.Show("You have correctly entered a date value."); }

else { dateVal = DateTime.MinValue; MessageBox.Show("Your value fits the mask, but it isn't a valid date."); } } If you use a custom type, you need to equip your type with a static Parse() method that converts a string (supplied as the only parameter) to the appropriate object instance. Here s the signature you need to follow: public static MyType Parse(string s) { ... } The MaskedTextBox will find this method (using reflection), and call it when the mask is complete, just before the TypeValidationCompleted event fires.

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