![]() Fluent Validation, on the other hand, is an open-source validation library used to solve complex validation requirements. It is still one of the most common ways used for model validation in ASP.NET MVC. – Configuring with Data Annotations is fairly simple because it allows you to configure all validation rules in one place that is within the model metadata class and they need not to be configured anyplace else. Difference between Data Annotation and Fluent Validation Simplicity The return type of each call then defines the valid methods for the next call. The idea behind fluent validation is to use chained method calls for producing code that’s easy for the developers to read. In addition, it also works well on models that you do not even own or cannot change. It is a great tool to help make your validation easy to create and easy to maintain. It is a server-side framework used to create advanced and complex validations for the user data. It also uses lambda expressions to allow you to write readable validation rules. NET that uses an easy-to-use fluent interface for building strongly typed validation rules. It is a third-party validation library for. Data Annotation and Fluent Validation are two such validations used to validate the user input data.įluent Validation is a popular open-source validation library used to solve complex validation requirements. Validation is a fundamental aspect in ASP.NET MVC applications which make developers turn to one of the many frameworks available to help them define and execute data validation. Validation can be done on the server side, or the client side, or at both the ends. In short, validation is the practice of ensuring quality data. If the user input is invalid, you should notify the user and then the user should re-enter the correct input data and submit it again. So, as a developer, you must validate the input data in your application. But as you know, the real world is not so ideal and people do make mistakes. Ideally, the users should enter correct data in a correct format. In either case, you need to validate the input data before using the data for further processing. Sometimes, some malign users would want to disrupt the application by knowingly entering inappropriate data. Sometimes, they enter incorrect data whether knowingly or unknowingly. ![]() But what are validations and why do you need those? Well, the data entered by users in not always reliable. Almost every web application requires some sort of validation. ![]()
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