FEVOR is an abbreviation for Fluent Extensible Validator and it’s a .NET validation library with lots of features that simplify the validation process in development by abstracting away the complex logic of conditional statements.
Features
- it can be used on any .NET project
 - removes conditional statements clutter by making use of a fluent syntax;
 - no need to learn any attributes or interfaces to extend it (it’s all based on extension methods);
 - makes validation code readable even for non-developers, making it easy to maintain it;
 - contains type-specific validation rules, but also generic rules that can be used on any type;
 - gives you two options of extending it;
 - has a built-in system for failure handling;
 - choose from four types of warning methods, or use different ones on each validation group;
 - has full support for NULL values/objects;
 - has built-in error messages that can be easily overridden with your own;
 - has a rich set of validation rules for the most common needs of a developer.
 
Included in the package
- The library’s source code which is heavily documented using XML tags;
 - A WinForms demo application;
 - Full API documentation in HTML and PDF format, with examples;
 - A complete PDF tutorial with 3 levels full of code samples, explaining every feature of this library;
 - A diagram exposing every member of this library.
 
Requirements
- .NET Framework 4.0;
 - Works on any type except dynamic types.
 
Sample code
Here’s a quick sample code to give you an idea of how FEVOR will enhance your validation process:
"abcdef".Check("s")
        .IsNotNull()
        .IsLongerThan(1, "string too short")
        .IsAlpha("the string should have only letters!")
        .IsValidHexColor("this is not a valid HEX color");
n.Check("n").IsInRange(-10,10).IsGreaterThan(0);