Validating data in wpf


01-Jun-2017 03:02

validating data in wpf-56

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Type conversion errors are serious and they are justified to be raising exceptions.In WPF, a type conversion error exception of this kind is raised by default in a data bound Text Box Control and by default it is ignored.

validating data in wpf-34

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First of all, we need to decide where the validation logic's implementation resedes.For example, the following code in the Full Name setter raises and exception when the Full Name contains the name "John": Again we are notified for the exception and the handler is called with the same code as before. The error message displayed in the tooltip says "Exception has been thrown by a target of an Invocation" although we have supplied a different message in the exception. So another approach is to implement the IData Error Info Interface.To show the correct message you need to display the message in e. This interface is used by the Data Binding mechanism to validate error.Should it be completely decoupled from the business object or not?

Initially, we distinguish Data Validation into three main categories: Type conversion errors (case 1) must throw exceptions and the exceptions must be caught by the GUI.Aside from the property level validation, Rad Data Form supports validation through data annotations.



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