Using FluentChecker you can implement a nice and fluent way to verify conditions and do simple parameters validations.
public class UserRepository()
{
public UserRepository(Connection connection)
{
Check.IfIsNull(connection)
.Throw<ArgumentNullException>( () => connection)
}
public User FindByName(string name)\
{
Check.IfIsNullOrWhiteSpace(name)
.Trow<ArgumentException>( () => name);
}
}The If methods are all are implemented in the [Check class] (https://github.com/SimoneLocatelli/FluentChecker/blob/master/FluentChecker/Check.cs).
If you want to extend it, the easiest way is to create a new static class; as long your as your methods return a boolean and you add the FluentChecker namespace, you will be able to concatenate them to the Throw methods (since they are extension methods for the bool type).
using FluentChecker
//...
public static class CustomCheck :
{
public static bool IfCustom()
{
// Your custom logic goes here
}
}And then to use it:
using FluentChecker
public static class Foo
{
public void DoStuff(string value)
{
Check.IfIsNullOrWhiteSpace(value).Throw<ArgumentException>( () => value );
CustomCheck.IfCustom(value).Throw<ArgumentException>( () => value );
//...
}
}
Easy!
Fluent Checker is available as Nuget package on [Nuget.org] (https://www.nuget.org/packages/FluentChecker/)
Install-Package FluentChecker